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PWS-600 User Manual - Prairie Wind Systems

1. Register Size Data Default Offset Registers Type Access Name Value 1803 1 USHORT R W Communication Settings 1804 1 USHORT R W Message Timeout ms 1000 1805 1 USHORT R W Network Wake Delay ms 0 1806 1 USHORT R W Retries 0 to 5 1 1807 1 USHORT R W Sentinel Value OxFFFF 1808 1 USHORT R W Good Message Counter 0 1809 1 USHORT R W Bad Message Counter 0 1810 1 USHORT R W Exception Response Counter 0 7 5 1 9 Communication Settings This register sets the protocol and the communication parameters for the network Register Bits Protocol Stop Parity Data Baud Rate 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 1 0 1 stop bit 0 2 stop bits 1 Even parity 0 0 Odd parity 0 1 No parity 1 0 7 data bits 0 8 data bits 1 1200 baud 0 0 0 0 2400 baud 0 0 0 1 4800 baud 0 0 1 0 9600 baud 0 0 1 1 19200 baud 0 1 0 0 38400 baud 0 1 0 1 57600 baud 0 1 1 0 For example to configure the network for MODBUS ASCII at 19200 baud 8 data bits even parity and 1 stop bit set this register to 532 32 PWS 600 User s Manual 7 5 1 10 Message Timeout The message timeout register specifies the maximum time that may elapse between characters within a message Intervals exceeding the timeout value will cause the device to assume an error has occurred and discard the message The valid range f
2. As an example it is desired to have a cellular modem on from 12 00 to 1 00 P M 12 00 to 13 00 each day Mountain Standard Time MST Since MST is UTC 6 hours that corresponds to 18 00 to 19 00 UTC Set bits 12 through 15 of register offset 8 61440 or OxF000 and bits O through 1 of register offset 9 3 or 0x0003 54 PWS 600 User s Manual 7 8 Discrete Outputs The two discrete I O terminals on the PWS 600 can be used as inputs or outputs This section describes how to program the discrete I O as outputs When programmed as an output the discrete cannot be used as an input Discrete Output Registers Register Size Data Default Number Registers Type Access Name Value 2501 1 USHORT R Discrete Output Status 0 2502 6 USHORT R W Discrete Output 1 Configuration 2508 6 USHORT R W Discrete Output 2 Configuration 7 8 1 Discrete Output Status This read only register provides the status of each of the discrete outputs Each discrete output is described by a single bit indicating its current output state 0 off 1 on The status of unsupported outputs will always be indicated as off Discrete Output Status Register 15 14 13 12 11 10 9 8 7 6 5 4 0 0 0 0 0 0 0 0 0 0 0 0 DIO2 DIO1 7 8 2 Discrete Output Configuration The following table defines the dis
3. sess enne enne nennen tenen nnnns 59 7 10 4 Download Record Count cccccccsssccesssneceesseeceeseaeceeseaeececeeaaeeecseaaeeecseaaeeeeseaaeeeeseaeeseeeaaes 60 7 10 95 Record Nambe occi nocicnt doter i reete ee Ree Repas esa eege 60 yo MM ol 60 T107 ME Co RE 60 7 10 8 Data Dectyptlohr iiec dter NEEN 61 7 10 9 Data Retrieval Procedure sssssssssssssssserssssressrrrssrtrrssttetssttrtssttrnssttntssttttesttntssttntsseennsstent 61 7 10 10 Data Log Download Commande 61 7 10 11 Last Data Log Record ect eege stadi cce uto Beckett ete 63 7 11 Sensor Network Pass Through Registers cc cccccccccsssessssecececeseesecseaeeececeseesesaeaeeeeeceseessaeaeeeesens 64 TAILL SensorNetwork 4 eicere ice ete to ee chested tessa sii Rees qU A cese dU ee 64 7 11 2 MODBUS Protocol Pass Througb 64 7 11 3 SDI 12 Protocol Dass Through eene nennen nenne nnne tn sa nasse ener an 64 PWS 600 User s Manual 7 12 Password Security Registers ccssccccccecessessssececececesseeaaececeescessesaeaeeececeseesaaeaeeeeeesssesesaeaeeeesens 66 7 12 1 Security PassWord ME 66 7 12 2 Login PasswoFd ener ea ure eeepc aer dinero ra euin cuales ct ie e RO de alude ested 66 7 13 Diagnostic Registers ecce ice SEA ENEE ESO ENEE CSC NEES 67 7 13 1 Configuration Flash Wrttes steunden aia nin ainin 67 7 13 2 Last E 67 7 13 3 Fault Information eni e cereis e netter ade eee Deo teo cri t DRE e rego auda 68 7 13 4 High and Low T
4. Products may not be returned without prior authorization To obtain a Returned Materials Authorization RMA number contact Prairie Winds Systems at the phone number below Please write the RMA number clearly on the outside of the shipping container Prairie Wind Systems shipping address is Prairie Wind Systems LLC RMAH O O Y 7784 Big Sky Court Windsor CO 80550 support prairiewindsystems com Phone 970 460 6066 Fax 970 692 2434 PWS 600 User s Manual 3 Overview The PWS 600 is a MODBUS slave device that periodically polls and logs data from a wide variety of analog discrete and smart sensors The current readings from the sensors are available to the MODBUS master device via a block of MODBUS holding registers Readings are polled and logged at the programmed rate and are automatically time stamped and check summed When the memory is full recording automatically wraps around to record the newest data over the oldest data All data are stored in non volatile flash memory which does not require power for data retention Standard write and read register commands are used to extract logged data from the device In addition to the data logging feature the PWS 600 extends the capabilities of a system with these additional features e Data can be recorded and retrieved securely using the Advanced Encryption Standard with a user defined key e The PWS 600 includes an accurate temperature compensated real ti
5. I Il l Hil Hi l Prairie Wind Ii H Systems LLC IM PWS 600 Data Logger User s Manual 14 10600 03 17 2014 PWS 600 User s Manual Copyright 2014 by Prairie Wind Systems LLC All Rights Reserved No part of this document may be photocopied reproduced or translated to another language without the prior written consent of Prairie Wind Systems The information contained in this document is subject to change without notice Prairie Wind Systems has made a reasonable effort to ensure that the information contained in this document is accurate as of the date of publication Prairie Wind Systems makes no warranty of any kind with regards to this material including but not limited to its fitness for a particular application Prairie Wind Systems will not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material In no event shall Prairie Wind Systems be liable for any claim for direct incidental or consequential damages arising out of or in connection with the sale manufacture delivery or use of any product PWS 600 User s Manual 1 Regulatory Information iecore terae ee tee Ee ie es DE vereda RISE Te dp 6 1 1 EE Em 6 1 2 Battery Statement uius eui ledio aa DEE REESEN EEN ebe sadecedes 6 2 Warranty and Assistance ceret cerise Ext Dante ko ca eee dub EEN 7 3 COMER VIO ERI M 8 E Te
6. 1 to 25 3 1 USHORT R W Output Format 0 4 2 FLOAT R W Scale Factor measurement units mV 1 0 6 2 FLOAT R W Offset measurement units 0 0 7 6 10 1 Analog Channel This register specifies the analog channel to be measured An analog channel defines the physical analog inputs to be used for the measurement as well as preconfigured ranges and functions Channel input Input Range Description 1 ANI1 AGND Oto 5000 mV Single ended consider BAT or SWBATx for power 2 AIN2 AGND Oto 5000 mV Single ended consider BAT or SWBATx for power 3 AIN3 AGND Oto 5000 mV Single ended consider BAT or SWBATx for power 4 AIN4 AGND Oto 5000 mV Single ended consider BAT or SWBATx for power 5 AIN5 AGND Oto 5000 mV Single ended consider BAT or SWBATx for power 6 AIN6 AGND Oto 5000 mV Single ended consider BAT or SWBATx for power 7 ANI1 AGND Oto 2000 mV Single ended consider BAT or SWBATx for power 8 AIN2 AGND Oto 2000 mV Single ended consider BAT or SWBATx for power 9 AIN3 AGND Oto 2000 mV Single ended consider BAT or SWBATx for power 10 AIN4 AGND Oto 2000 mV Single ended consider BAT or SWBATx for power 11 AIN5 AGND Oto 2000 mV Single ended consider BAT or SWBATx for power 12 AIN6 AGND Oto 2000 mV_ Single ended consider BAT or SWBATx for power 13 ANI1 AGND Oto 1000 mV Single ended consider BAT or SWBATx for power 14 AIN2 AGND Oto
7. Scale Factor Measured Value Offset The scale factor and offset are applied before conversion to one of the short formats occurs Note also that the platinum RTD channels provide temperature in Celsius units Scaling is only necessary to convert units or improve the resolution when using one of the integer formats 48 PWS 600 User s Manual 7 6 11 Discrete Command Group Format The following table defines the sensor command group for a discrete sensor network Each register in the table is an offset from the first register of the sensor command group as specified in the Data Log Configuration Registers Table Discrete Sensor Command Group Register Size Data Default Offset Registers Type Access Name Value 0 1 USHORT R W Sensor Network 1 1 USHORT R W Discrete Channel 2 1 USHORT R W Reserved 0 3 1 USHORT R W Output Format 0 4 2 FLOAT R W Scale Factor measurement units mV 1 0 6 2 FLOAT R W Offset measurement units 0 0 7 6 11 1 Discrete Channel This register specifies the discrete channel to be measured A discrete channel defines the physical discrete inputs to be used for the measurement as well as preconfigured ranges and functions Channel Input Description 1 DIO1 Input state 0 or 1 2 DIO2 Input state 0 or 1 3 DIO1 Positive edge debounced switch counter counts up to 65535 switch closures between log records
8. Sense pair to AIN4 and AIN3 47 PWS 600 User s Manual 7 6 10 2 Measurements to Average This register specifies the number of consecutive channel measurements to average The number of readings averaged will have an impact on the fastest log interval that can be achieved Setting this register to one disables averaging 7 6 10 3 Output Format The output format specifies how the sensor measurement is formatted and added to the current data record Output Format Value Description 0 USHORT 1 register 1 SHORT 1 register 2 FLOAT 2 registers The internal measurement result is a floating point value specifying a FLOAT output places the measurement result directly into the current data record as a FLOAT If an USHORT value is specified the floating point value is rounded to an unsigned integer value in the range 0 to 65535 If the rounded value is greater than 65535 65535 is output If the rounded value is less than zero then zero is output If a SHORT value is specified the floating point value is rounded to a signed integer value in the range 32768 to 432767 If the rounded value is greater than 432767 32767 is output If the rounded value is less than 32768 32768 is output 7 6 10 4 Scale Factor and Offset The scale factor and offset can be used to convert the measured value to the appropriate sensor parameter units according to the following equation Measured Output
9. when the master device sets Log Pause back to zero or will resume automatically when Log Pause counts down to zero Attempting to write a log configuration register while the data log is enabled or paused will result in an exception response with the READ ONLY REGISTER exception code 40 PWS 600 User s Manual 7 6 3 Next Scheduled Record These registers return the date and time of the next scheduled record These registers return zero if the log is disabled or paused 7 6 4 Log Interval The log interval specifies the time between data records in seconds The log interval can range from 0 to 43200 seconds 12 hours or 2 records per day and must specify a whole number of records per day Setting the log interval to zero specifies an interval of 86400 seconds 24 hours or 1 record per day Attempting to write a value that would not result in a whole number of records per day will result in an exception response with the ILLEGAL WRITE VALUE exception code Data records are synchronized with the real time clock The first data record each day is always collected at 00 00 00 plus the log offset value If for example the log interval is set to 21600 seconds 6 hours and the log offset is zero the PWS 600 will log 4 records per day at 00 00 00 06 00 00 12 00 00 and 18 00 00 7 6 5 Log Offset The log offset specifies the offset of the first record from 00 00 00 each day The offset is specified in seconds and can range from 0 to
10. 1 5 Boot Code Versi ON EE 21 7 1 6 Hardware Version E 22 7 1 7 CH EN 22 7 1 8 Site NAME ege 22 7 1 9 Sites at dun EL o E A ILLUD LIII 22 7 1 10 Device Address cocci eiicic direi tet di theo aret eeesich idee niches d Teese aie iat 22 7 1 11 Low Voltage Warning Threshold eese 22 7 2 Device Commiand Register ederet see decia stesico Eed 23 7 3 Device Status Registers RM 25 7 3 1 Device ECC 25 7 3 2 Ambient Temperature sestiere oce cta becet o ieu gocce tod o cxveu eege 26 7 3 3 Input e TEE 26 7 3 4 Charge Kelte enee eegene 26 7 3 5 Date and lun CC 26 7 4 Communication Configuration Register 27 7 4 1 Communication Kl ale 27 7 4 2 Message TIME OUt EE 28 PWS 600 User s Manual 7 4 3 Sleep TIMEOUT ed Eeer bed a atin anche AG Ee REES 28 7 4 4 Messag COUFIters cuore eoe inca ce soiree iu sanacaedsbtecock Denctade shes te ra esce ERU aM DEOS 28 7 5 Sensor NetWOrkS osasista TTE 29 7 5 1 R5485 Smart Sensor Network e ceieieee eise ee eite eere tan eene aan nennt aane danse aaa oi de aa nad aee 29 7 5 2 SDI 12 Smart Sensor Network 35 7 5 3 Analog Sensor Network sek 37 7 5 4 Discrete Sensor Network 2 iie eet ceo esae reete tne debes ege eee arn NEEN 38 7 6 Data Log Configuration Registers sissors ieni eaeoe aa e iaeiei siia a aR doeii 39 7 6 1 log Diels EEN A0 7 6 2 LOS PAUSE 40 7 6 3 Next Scheduled Record reete ere dee EE deg
11. 1000 mV Single ended consider BAT or SWBATx for power 15 AIN3 AGND Oto 1000 mV Single ended consider BAT or SWBATx for power 16 AIN4 AGND Oto 1000 mV Single ended consider BAT or SWBATx for power 17 AIN5 AGND Oto 1000 mV Single ended consider BAT or SWBATx for power 18 AIN6 AGND Oto 1000 mV Single ended consider BAT or SWBATx for power 46 PWS 600 User s Manual Channel Input Input Range Description 19 ANI1 AGND 0 to 500 mV Single ended consider BAT or SWBATx for power 20 AIN2 AGND 0 to 500 mV Single ended consider BAT or SWBATx for power 21 AIN3 AGND 0 to 500 mV Single ended consider BAT or SWBATx for power 22 AIN4 AGND 0 to 500 mV Single ended consider BAT or SWBATx for power 23 AIN5 AGND 0 to 500 mV Single ended consider BAT or SWBATx for power 24 AIN6 AGND 0 to 500 mV Single ended consider BAT or SWBATx for power 25 AIN2 AIN1 2000 mV Differential consider VEX amp AGND for excitation 26 AINA AIN3 2000 mV Differential consider VEX amp AGND for excitation 27 AIN6 AIN5 2000 mV Differential consider VEX amp AGND for excitation 28 AIN2 AIN1 1000 mV Differential consider VEX amp AGND for excitation 29 AINA AIN3 1000 mV Differential consider VEX amp AGND for excitation 30 AIN6 AIN5 1000 mV Differential consider VEX amp AGND for excitation 31 AIN2 AIN1 500 mV Differential
12. 2311 1 USHORT R Register Count 2312 64 USHORT R Data Registers 51 PWS 600 User s Manual 7 7 Switched Power Outputs The PWS 600 provides two switched battery outputs labeled SWBAT1 and SWBAT2 Each output is capable of switching up to 0 5 amperes and can be programmed to turn on during the measurement time to power sensors or programmed to turn on and off on a daily schedule to power a radio or cellular modem for remote access A third switched power output is available on the RS232 connector on pin 9 This 5V 275 mA supply can be used to power master side RS232 communication accessories such as a modem or Ethernet adapter Switched Power Output Registers Register Size Data Default Number Registers Type Access Name Value 2401 1 USHORT R Switched Output Status 0 2402 11 USHORT R W Switched Output SWBAT1 Configuration 2413 11 USHORT R W Switched Output SWBAT2 Configuration 2424 11 USHORT R W RS232 5V Switched Output Configuration 7 7 1 Switched Output Status This read only register provides the status of each of the switched outputs Switched Output Status Register 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 reserved reserved reserved reserved reserved RS232 5V SWBAT2 SWBAT1 Each switched output is described by a pair of bits indicating its current output state The status of unsupported reserved switc
13. 75K ohm polarity terminations Common Mode Range 7 Vdc Transient Protection 250 Watts Peak Protocol Half Duplex MODBUS over Serial Line or SDI 12 Transmission Modes RTU ASCII Addressing 1 to 247 plus broadcast Baud Rates 1200 2400 4800 9600 19200 38400 57600 Data Bits 7 8 Parity Odd Even None Stop Bits 1 2 Smart Sensor SDI 12 Port SDI Version 1 3 Data Line Bidirectional tri state 5V logic Transient Protection 250 Watts Peak Analog Voltage Sensor Inputs Inputs 6 single ended or 3 differential Single ended Ranges 0 to 5000 0 to 2000 0 to 1000 0 to 500 mVdc Differential Ranges 2000 1000 500 250 125 60 30 mVdc Resolution 0 002 FS Accuracy 0 05 of reading 0 01 FS over operating temperature range Voltage Excitation 4 096 Vdc 0 05 30 mA maximum Resistive Excitation 3900 ohms 0 15 connected to the voltage excitation 10 PWS 600 User s Manual Current Loop Terminations Terminations 2 Range O to 20 mA Resolution 0 0003 mA Accuracy 0 3 of reading 0 002 mA Loop Compliance 1 Vdc at 20 mA RTD Termination RTD Type Pt1000 Range 50 to 200 C Resolution 0 1 C Accuracy 1 C RTD accuracy Discrete Input Outputs Channels 2 Input Output Voltage 0 to 32 Vdc Input High Threshold 2 5 Vdc In
14. Assigning note records to a constant size of 64 registers is recommended If the defined STRING data type is used this allows notes to be up to 128 characters long 7 9 3 Recording Speed The PWS 600 is capable of recording data as fast as 1 record per second provided that the data log has not wrapped around Once the data log has wrapped around the recording rate drops to 1 record every 5 seconds This is necessary in order to provide time for block erasures when the oldest data is erased In addition the log configuration settings must be considered The response timeout value and the number of retries will affect the maximum recording speed 58 PWS 600 User s Manual 7 10 Data Log Retrieval Registers These registers allow a master device to retrieve data records from the data log Data Log Retrieval Registers Register Size Data Default Number Registers Type Access Name Value 1400 2 ULONG R Data Log Size bytes 4 194 304 1402 2 ULONG R Data Log Used bytes 0 1404 2 ULONG R Lowest Record Number 0 1406 2 ULONG R Highest Record Number 0 1408 1 USHORT R W Download Record Count 0 1409 2 ULONG R W Record Number 0 1411 1 USHORT R Record Size in Registers 0 1412 4 TIME R Date and Time 0 1416 1 USHORT R Site Id 0 1417 1 USHORT R Device Id 0 1418 2 ULONG R Device Serial Number 0 1420 1 USHORT R Device Status 0 1421 1 SHORT R Ambient Temperature Cx 10 1422 1 USHORT
15. Bad Message Counter 0 1810 1 USHORT R W Retry Counter 0 7 5 1 16 Communication Settings This register sets the protocol and communication parameters for the network Register Bits Protocol Stop Parity Data Baud Rate 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 1 0 0 0 1 stop bit 0 Even parity 0 0 7 data bits 0 1200 baud 0 0 0 0 This register can only be written with a value of 2048 when the SDI 12 protocol is selected 7 5 1 17 Retry Registers These registers specify the number of times the device is to resend a break and command if an SDI 12 sensor does not respond within the required timeout Zero specifies no retries only one break and one command attempt will be made If the sensor fails to respond to a command after the allowed number of retries the sensor will be considered unresponsive and the SDI 12 sentinel value will be substituted for all values that were expected by the command Each break attempt is followed by the specified number of command attempts For example if break retries is set to 1 and command retries is set to 2 1 The device will first send a break followed by the command 2 If no response is received the command will be retried two more times 34 PWS 600 User s Manual 3 If still no response is received the break will be retried followed by three more attempts to send the command 4 If st
16. Group Size Data Default Register Registers Type Access Name Value 1803 1 USHORT R W Communication Settings 1804 1 USHORT R W Message Timeout ms 0 1805 1 USHORT R W Network Wake Delay ms 0 1806 1 USHORT R W Retries 0 to 5 1 1807 1 USHORT R W Sentinel Value OxFFFF 1808 1 USHORT R W Good Message Counter 0 29 PWS 600 User s Manual 1809 1 USHORT R W Bad Message Counter 1810 1 USHORT R W Exception Response Counter 7 5 1 2 Communication Settings This register sets the protocol and the communication parameters for the network Note that 7 data bits in the RTU transmission mode is an invalid combination the device will respond with an exception and the ILLEGAL WRITE VALUE exception code Register Bits Protocol Stop Parity Data Baud Rate 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 1 1 stop bit 2 stop bits 1 Even parity 0 0 Odd parity 1 No parity 1 0 7 data bits 0 8 data bits 1 1200 baud 0 0 0 0 2400 baud 0 0 0 1 4800 baud 0 0 1 0 9600 baud 0 0 1 1 19200 baud 0 1 0 0 38400 baud 0 1 0 1 57600 baud 0 1 1 0 For example to configure the network for MODBUS RTU at 19200 baud 8 data bits even parity and 1 stop bit set this register to 276 7 5 1 3 Message Timeout The message timeout register specifies the amount of idle tim
17. R Input Voltage mV 1423 1 USHORT R Register Count 0 1424 64 USHORT R Data Registers 0 1488 4 USHORT R Encryption Padding Registers 7 10 1 Data Log Size This register returns the data log memory size in bytes 7 10 2 Data Log Used This register returns the number of data log memory bytes currently used Combined with the data log size the register can be used to calculate the percent of memory used and percent of memory remaining 7 10 3 Lowest and Highest Record Numbers If no records have been logged both the lowest and highest record numbers will be zero Records are numbered beginning at record one The highest record number will increment with each record logged the highest record number is also the total number of records recorded since the log was last erased As long as the data log hasn t wrapped the lowest record number will remain at one Once the log wraps around the lowest record number will begin to advance as the oldest data is deleted Every record will have a unique and always increasing number If the user keeps track of the last record number that was retrieved only higher record numbers will need to be retrieved at the next download 59 PWS 600 User s Manual 7 10 4 Download Record Count This register specifies the maximum number of records to transfer when the Data Log Download command is used The default value of zero permits continuous streaming of data records This
18. Registers Additional module security is available by enabling password protection When a security password is written to the PWS 600 the master device must log in with the correct password in order to access any of the device registers When the device is secure only the read slave id function and the write to the login password registers are possible Data Log Retrieval Registers Register Size Data Default Number Registers Type Access Name Value 3000 10 STRING Ww Security Password 0 3010 10 STRING Ww Login Password 0 7 12 1 Security Password This ten register non volatile register string sets the password for the device By default the registers are set to zero disabling password protection The device slave id and all device registers are open and accessible Writing a 10 register non zero password to these registers enables password security If no communication port activity is detected after a period of 60 seconds or if the Security Mode device command 56320 is issued the device will enter its secure mode In the security mode only the slave id and the login password registers are available Attempting to perform any other function while in the security mode will result in an exception response with the SECURITY MODE exception code Note It is the responsibility of the user to manage passwords Once written the security password cannot be read out of the device Once the device is se
19. Size Data Default Number Registers Type Access Name Value 1000 1 USHORT R Register Map Version 2 1001 1 USHORT R Device Id 600 1002 2 ULONG R Serial Number 1004 1 USHORT R Firmware Version 1005 1 USHORT R Boot Code Version 1006 1 USHORT R Hardware Version 1007 1 USHORT R W Site Id 0 1008 16 STRING R W Site Name 0 1024 32 USHORT R W Site Information 0 1056 1 USHORT R W Device Address 1 1057 1 USHORT R W Low Voltage Warning Threshold 9600 mV 7 1 1 Register Map Version This is the version of the register map supported by the device This provides for the modification of the register map at a future date and detection of the difference by the master device 7 1 2 Device Id This is the model number of the device It can be used to validate the system configuration and to identify the available feature set 7 1 3 Serial Number This is the serial number of the device The master device can read the serial number of the device to provide system traceability 7 1 4 Firmware Version This register identifies the firmware version of the device 7 1 5 Boot Code Version This register identifies the boot code version of the device The boot code supports field upgrades of the device firmware The boot code on a given device will not change with firmware upgrades Its version is made available to support field upgrade utilities 21 PWS 600 User s Manual 7 1 6 Hardware Version This register contains the hardware version of
20. Te ele Te CN 9 5 Metali E 13 5 1 Environmental Considerations i2c siicc asiicccsesncdevsancieceseustccssaticccdssaviccasavcccssuvstedesuiiccceasasddevanccee 13 5 2 Mounting the DEVIC eec ege a ce he emu c ovde nad ev oed Aa tene e ose esed s 13 5 3 Connector le ER 14 5 4 Terminal Block ACCESSONY reet oer Dee ENEE ee 15 5 5 Mee len TEE 16 5 6 Charging Requirements om e tete e eene ERE sessed tere esuse pete ee ed edet aee eaa pda d 16 5 7 Status MACIO S b 17 5 8 COMMUNI CAC ON ee 18 5 8 1 RS Signals 5 erre o ve epe tec eh ee tee eren 18 5 8 2 RS232 Sinal pL E 18 6 Getting Started Ote e edite toO teet ed Loved Ge dona epu redeas eee utu una De bed etus 19 6 1 Device Configul ation retro eer ee reete e nete ed Re n EE EE a oe users eda de 19 6 2 Network Communication Settings cccccccssssssssscecececsssessceseeececsssesseaeeeeeescesseseeaeseeeesesssessaaeess 19 6 3 Site IGSNtHICATI ON et 19 6 4 Configure the Sensor Networks cc cccccsssceceessececeessececeesaeeeceesaeeecsesseeecsesaeeecsesaeeeceesaeeeesesaeeesees 20 6 5 Config re the Data Log eee ie ete e e dc e t REESE CLONE caveat riter estt exer eek 20 KSE E 21 7 1 Device Configuration Reglsters 3 deve tete m E RR ERE ERR ean oe UY keels 21 7 1 1 Register Map We EE 21 7 1 2 BIAIADeTL 21 7 1 3 Serial js semt c niet 21 7 1 4 Firmware VersiON E 21 7
21. battery or power input parallel with pin 7 23 SWBAT1 Switched power output 1 parallel with pin 8 24 SWBAT2 Switched power output 2 parallel with pin 9 25 SDI 12 DATA SDI 12 smart sensor network data line 26 VEX Analog excitation voltage output 27 REX Analog excitation resistor output 28 AIN5 Analog input 5 29 AIN3 Analog input 3 30 AIN1 Analog input 1 14 PWS 600 User s Manual Pin Name Description 31 RTS RS232 RTS input from pin 7 of a 9 pin D sub plug 32 DSR RS232 DSR output to pin 6 of a 9 pin D sub plug 33 RI 5V RS232 RI input 5V switched output to pin 9 of a 9 pin D sub plug 34 WAKE WAKE input 35 RS485A Master side RS485A network input output 36 RS485B Master side RS485B network input output 37 SEN485A Smart sensor RS485A network input output 38 SEN485B Smart sensor RS485B network input output 39 LOOP2 Current loop 2 resistor termination to GND 40 LOOP1 Current loop 1 resistor termination to GND 41 AGND Analog ground reference 42 AIN6 Analog input 6 43 AIN4 Analog input 4 44 AIN2 Analog input 2 For reliability of the connection the mating connector should utilize the mounting standoffs provided The cable length should be kept as short as practical The maximum length of cable for an RS485 network is 4000 feet 1200 meters The maximum length of cable for an SDI 12 network is 200 feet 60 meters 5 4 Terminal Block Accessory The
22. consists of writing user specific settings to one or more of the device registers The Prairie View Software supplied with the device provides a convenient step by step means to configure the device and is the recommended place to start Refer to the software manual for instructions on installing the software on your desktop computer laptop computer or mobile device It is also possible to configure the device by directly writing to the registers using a master device with pass through capability or using a third party software tool 6 2 Network Communication Settings Before the device is placed on an active RS485 network it must be configured to match the network s communication settings and be assigned a unique device address The device is preconfigured with the MODBUS standard settings of 19200 baud 8 data bits even parity 1 stop bit RTU transmission mode and device address 1 Refer to the Device Configuration section of the device register map to change the device address Refer to the Communication Configuration Registers section of the device register map if any of the communication settings need to be changed 6 3 Site Identification If the user is collecting data from multiple devices located at different sites it is recommended that the Site Id register be written with a unique value for each site The Site Id is recorded with every data record making it easier to track the data once it has been retrieved from a device 19 PW
23. greater than 65535 65535 is output If the rounded value is less than zero then zero is output If a SHORT value is specified the floating point value is rounded to a signed integer value in the range 32768 to 32767 If the rounded value is greater than 32767 32767 is output If the rounded value is less than 32768 32768 is output 7 6 11 3 Scale Factor and Offset The scale factor and offset can be used to convert the measured value to the appropriate sensor parameter units according to the following equation Measured Output Scale Factor Measured Value Offset The scale factor and offset are applied before conversion to one of the short formats occurs 50 PWS 600 User s Manual 7 6 12 Last Sensor Readings These registers allow a master device to read the last sensor readings The last sensor readings may be generated by the last log record or by the read sensors device command The format of the data registers is determined by the sensor command groups These registers are not encrypted The registers are volatile and will reset to zero if power is removed Last Data Log Record Registers Register Size Data Default Number Registers Type Access Name Value 2300 4 TIME R Date and Time 2304 1 USHORT R Site Id 2305 1 USHORT R Device Id 2306 2 ULONG R Device Serial Number 2308 1 USHORT R Device Status 2309 1 SHORT R Ambient Temperature Cx 10 2310 1 USHORT R Input Voltage mV
24. is removed 36 PWS 600 User s Manual 7 5 3 Analog Sensor Network A group of eight registers define and configure the network These eight registers must be read and written within a single command The register block may not be written when logging is enabled Attempting to write the register block when logging is enabled will generate an exception response with the READ ONLY REGISTER exception code Analog Sensor Network Configuration Group Register Size Data Default Offset Registers Type Access Name Value 1823 1 USHORT R W Excitation Enable and Delay ms 0 1824 1 USHORT R W Reserved 0 1825 1 USHORT R W Reserved 0 1826 1 USHORT R W Reserved 0 1827 1 USHORT R W Reserved 0 1828 1 USHORT R W Reserved 0 1829 1 USHORT R W Reserved 0 1830 1 USHORT R W Reserved 0 7 5 3 1 Excitation Enable and Delay Some analog sensors require an excitation signal to be applied in order to make a measurement The PWS 600 provides a voltage excitation VEX on terminal block TB2 and a resistive excitation REX on terminal block TB1 In order to conserve power these excitation outputs are normally turned off This register specifies how long to allow sensor outputs to stabilize after turning on excitation before taking analog measurements The delay is specified in milliseconds and can range from 0 to 65535 milliseconds The amount of delay will have an impact on the fastest log interval that c
25. low threshold ON battery input below low threshold ON battery input above low threshold ON battery input above low threshold FLASHING battery is charging ON battery is charged OFF no charge faults OFF no charge faults ON battery input above low threshold OFF battery input below low threshold ON charge voltage detected ON charge voltage detected ON charging fault ON charging fault e 005 00 e eo00j0oe9 O charge input too low charge input too low e temperature outside charge range e temperature outside charge range e battery is not accepting charge e battery is not accepting charge 17 PWS 600 User s Manual The blue LED indicates the logging state of the device as shown below O OFF Logging is disabled The LED will pulse ON when a manual scan of the sensors is triggered e ON Logging is enabled The LED will pulse OFF when a log scan of the sensors triggered e FLASHING Logging has been paused for a preset amount of time 5 8 Communication Communication with the data logger is done using the MODBUS serial line protocol over the RS485 or RS232 interface The device is preconfigured with the MODBUS standard settings of 19200 baud 8 data bits even parity 1 stop bit RTU transmission mode and device address 1 5 8 1 RS485 Signals RS485 communication is done using signals on terminal block TB10 labeled PLC Three signals are required to be connected to the maste
26. register This is the basic MODBUS holding register data type Register Byte 1 Byte 2 Bits 15 8 Bits 7 0 72 PWS 600 User s Manual 8 5 2 SHORT Signed Short A signed short is a 16 bit two s complement signed integer value in the range 32768 to 32767 The value is contained in a single register Register Byte 1 Byte 2 Sign Bits 14 8 Bits 7 0 8 5 3 ULONG Unsigned Long An unsigned long is a 32 bit unsigned integer value contained in two consecutive registers Values can range from 0 to 4 294 967 295 Register Register 1 Byte 1 Byte 2 Byte 3 Byte 4 Bits 31 24 Bits 23 16 Bits 15 8 Bits 7 0 8 5 4 LONG Signed Long A signed long is a 32 bit two s complement signed integer value contained in two consecutive registers Values can range from 2147483648 to 42147483647 Register Register 1 Byte 1 Byte 2 Byte 3 Byte 4 Sign Bits 30 24 Bits 23 16 Bits 15 8 Bits 7 0 8 5 5 FLOAT Floating Point A float is a 32 bit IEEE 754 floating point value contained in two consecutive registers Register Register 1 Byte 1 Byte 2 Byte 3 Byte 4 SXXXXXXX XMMMMMMM MMMMMMMM MMMMMMMM S is the sign bit X is the 8 bit exponent and M is the 23 bit mantissa 73 PWS 600 User s Manual 8 5 6 STRING Character String A string is a sequenc
27. shipping via highway rail vessel or cargo only aircraft and covers all shipments into or out of the United States The label must be in contrasting color and the letters must be 12 mm 0 5 in in height for packages weighing more than 30 Kg and 6 mm 0 25 in in height for packages weighing less than 30 Kg The lithium battery does not contain enough lithium to qualify as a reactive hazardous waste The battery is safe for disposal in the normal municipal waste stream PWS 600 User s Manual 2 Warranty and Assistance The PWS 600 is warranted by Prairie Wind Systems LLC to be free from defects in materials and workmanship under normal use and service for twelve 12 months from the date of shipment unless specified otherwise Prairie Wind Systems obligation under this warranty is limited to repairing or replacing at Prairie Wind Systems option defective products The customer shall assume all costs of removing reinstalling and shipping defective products to Prairie Wind Systems Prairie Wind Systems will return such products by surface carrier prepaid This warranty shall not apply to any product which has been subjected to modification misuse neglect accidents of nature or shipping damage This warranty is in lieu of all other warranties expressed or implied including warranties of merchantability or fitness for a particular purpose Prairie Wind Systems is not liable for special indirect incidental or consequential damages
28. the data record registers with one command regardless of the record size Only the data registers specified by the register count will contain valid information If the data is unencrypted the register numbers and sizes shown in the table above can be read to extract portions of the data record if not all of the information is needed If the data is encrypted reading individual registers from the table will not be useful A read registers command must be used to read the number of registers specified by the record size All of the registers in the record are required in the decryption process The unencrypted record format for logged data is the same as that described for the data polling registers 60 PWS 600 User s Manual 7 10 8 Data Decryption The Prairie View Software that comes with the device provides data decryption and the capability to view and export data from encrypted logs The Advanced Encryption Standard is supported by many operating systems so it is possible for user applications and third party software to decrypt logs providing that the original encryption key is known 7 10 9 Data Retrieval Procedure The following procedure describes data retrieval using conventional MODBUS register read and write commands 1 The master device reads the lowest and highest record number registers to determine the valid record number range and selects the range of records to be downloaded 2 The master device writes a rec
29. the device 7 1 7 Site Id The Site Id is a general purpose non volatile read write register The contents of this register are recorded with each logged data record permitting data to be traced to a particular site or system 7 1 8 Site Name The Site Name identifies the site to a user The 16 register non volatile string holds up to 32 characters 7 1 9 Site Information Site Information is comprised of 32 general purpose non volatile read write registers Use these registers to hold system configuration and or calibration data The format of the data contained in the registers is defined by the user They can be used as individual registers or combined to form ULONG FLOAT or STRING data types These registers should not be used to hold data that changes frequently 7 1 10 Device Address The device address is used to address the PWS 600 on the MODBUS network The valid range for the device address is 1 to 247 The default value is 1 When this register is written the response will be returned with the previous address All subsequent commands must be sent with the new address The register is non volatile The address is used on both the RS485 and RS232 interfaces 7 1 11 Low Voltage Warning Threshold If the battery input voltage to the device is less than or equal to this threshold the low voltage warning status bit is set in the device status register The threshold is set in millivolts and can range from 8000 to 32000 mV 8 to 32 v
30. time is 90 seconds Erasing the data log does not affect the current encryption key This command is not allowed while data logging is enabled 56541 OxDCDD Download Data Log Starts the fast data download process The maximum response time to this command is 1000 milliseconds Refer to the Data Retrieval Registers section for a description of the command 56320 0xDCOO Security Mode Places the device in the security mode requiring a master device to log in with a password to regain access The command has no effect if password security is disabled 56480 OxDCAO Read Sensors Causes the PWS 600 to read data from its sensors immediately using the command sequence currently specified for data logging Sensor values are placed in the last sensor reading registers but are not logged The device status register should be monitored to determine when sensor values are valid 23 PWS 600 User s Manual Device Commands continued Value Name Description 56481 OxDCA1 SDI 12 Command Sends the command contained in the SDI 12 pass through registers to a sensor located on the SDI 12 network The data log must be disabled or paused in order to use this command 56482 OxDCA2 SDI 12 over RS485 Sends the command contained in the SDI 12 pass through Command registers to a sensor located on the SDI 12 network The data log must be disabled or paused in order to use this command 5648
31. to a maximum of 20 Future versions of the specification may increase this limit The PWS 600 will support up to 32 measurement values from a sensor allowing for some future expansion For example a sensor returns three parameters A B and C to measurement command M and the measurement selection bit mask is set to 5 binary 00000000 00000101 Measurements A and C will be logged and measurement B will be discarded If a sensor does not return enough measurements to match a set bit the SDI 12 sentinel value will be recorded in place of the measurement For example if a sensor returns three parameters to a measurement command A B and C and the measurement selection bit mask is set to 13 binary 00000000 00001101 measurements A and C will be logged measurement B will be discarded and the SDI 12 sentinel value will be logged in place of the missing 4 measurement 45 PWS 600 User s Manual 7 6 10 Analog Command Group Format The following table defines the sensor command group for an analog sensor network Each register in the table is an offset from the first register of the sensor command group as specified in the Data Log Configuration Registers Table Analog Sensor Command Group Register Size Data Default Offset Registers Type Access Name Value 0 1 USHORT R W Sensor Network network 3 only 3 1 1 USHORT R W Analog Channel 1 to 49 2 1 USHORT R W Measurements to Average
32. 0 and any SDI 12 sensor is 200 feet 60 meters A group of eight registers define and configure the network These eight registers must be read and written within a single command The register block may not be written when logging is enabled Attempting to write the register block when logging is enabled will generate an exception response with the READ ONLY REGISTER exception code SDI 12 Sensor Network Configuration Group Register Size Data Default Offset Registers Type Access Name Value 1813 1 USHORT R W Communication Settings 2048 1814 1 USHORT R W Break Retries 0 to 5 2 1815 1 USHORT R W Command Retries 0 to 5 2 1816 2 FLOAT R W Sentinel Value 99999 1818 1 USHORT R W Good Message Counter 0 1819 1 USHORT R W Bad Message Counter 0 1820 1 USHORT R W Retry Counter 0 35 PWS 600 User s Manual 7 5 2 1 Communication Settings This register sets the protocol and communication parameters for the network This register must be written with a value of 2048 Register Bits Protocol Stop Parity Data Baud Rate 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 0 0 1 0 0 0 1 stop bit 0 Even parity 0 0 7 data bits 0 1200 baud 0 0 0 0 7 5 2 2 Retry Registers These registers specify the number of times the device is to resend a break and command if an SDI 12 sensor does not respond within the requi
33. 0x0200 Reserved Always returns O 10 0x0400 Reserved Always returns O 11 0x0800 Reserved Always returns 0 12 0x1000 Reserved Always returns 0 13 0x2000 Reserved Always returns 0 14 0x4000 Reserved Always returns 0 15 0x8000 Reserved Always returns O The status register is non volatile information is retained across a power outage The status represents events that occurred since the last time the register was cleared The device status is recorded with each logged data record The status register can be cleared at any time by writing zero to it Any conditions that persist or reoccur after being cleared will cause those bits to be set again Attempting to 25 PWS 600 User s Manual write any value other than zero to clear the register will generate an exception response with the ILLEGAL WRITE VALUE exception code 7 3 2 Ambient Temperature This register measures and returns the ambient temperature in degrees Celsius C multiplied by 10 For example an ambient temperature of 23 7 C will be read as 237 7 3 3 Input Voltage This register measures and returns the battery input voltage applied to the device in millivolts mV For example a battery input voltage of 13 54 volts will be read as 13540 7 3 4 Charge Voltage This register measures and returns the charging voltage applied to the device in millivolts mV For example a charge input voltage of 19 76 volts will be read as 19760 7 3 5 Date and Time T
34. 1501 1 USHORT R W Log Pause seconds 0 1502 4 TIME R Next Scheduled Record UTC 1506 1 USHORT R W Log Interval seconds 3600 1507 1 USHORT R W Log Offset seconds 0 1508 1 USHORT R W Number of Sensor Commands 0 to 32 0 1509 8 USHORT R W Sensor Command 1 1517 8 USHORT R W Sensor Command 2 1525 8 USHORT R W Sensor Command 3 1533 8 USHORT R W Sensor Command 4 1541 8 USHORT R W Sensor Command 5 1549 8 USHORT R W Sensor Command 6 1557 8 USHORT R W Sensor Command 7 1565 8 USHORT R W Sensor Command 8 1573 8 USHORT R W Sensor Command 9 1581 8 USHORT R W Sensor Command 10 1589 8 USHORT R W Sensor Command 11 1597 8 USHORT R W Sensor Command 12 1605 8 USHORT R W Sensor Command 13 1613 8 USHORT R W Sensor Command 14 1621 8 USHORT R W Sensor Command 15 1629 8 USHORT R W Sensor Command 16 1637 8 USHORT R W Sensor Command 17 1645 8 USHORT R W Sensor Command 18 1653 8 USHORT R W Sensor Command 19 1661 8 USHORT R W Sensor Command 20 1669 8 USHORT R W Sensor Command 21 1677 8 USHORT R W Sensor Command 22 39 PWS 600 User s Manual Data Log Configuration Registers Register Size Data Default Number Registers Type Access Name Value 1685 8 USHORT R W Sensor Command 23 1693 8 USHORT R W Sensor Command 24 1701 8 USHORT R W Sensor Command 25 1709 8 USHORT R W Sensor Command 26 1717 8 USHORT R W Sensor Command 27 1725 8 USHORT R W Sensor Command 28 1733 8 USHORT R W
35. 2 OxDCA2 Clear Sensor Clears sensor network message counters Diagnostics 24 PWS 600 User s Manual 7 3 Device Status Registers The device status registers allow the master device to obtain the current operating status of the device Device Status Registers Register Size Data Default Number Registers Type Access Name Value 1070 1 USHORT R W Device Status 0 1071 SHORT Ambient Temperature Cx 10 1072 1 USHORT Input Voltage mV 1073 1 USHORT Charge Voltage 0 mV 1074 4 TIME R W Date and Time UTC 7 3 1 Device Status This register contains device operational status Each bit in the register represents a status value as defined in the following table Device Status Register Bit Mask Name Description 0 0x0001 Power Outage A power outage caused a hardware reset and recovery 1 0x0002 Low Voltage The input voltage is below the warning threshold 2 0x0004 Clock Battery Timekeeping backup battery is low 3 0x0008 Clock Fault Timekeeping restarted at 2000 01 01 00 00 00 00 4 0x0010 Clock Adjusted Date and Time were changed 5 0x0020 Device Fault A device fault caused a reset and recovery 6 0x0040 Temperature Device operating temperature range was exceeded 7 0x0080 Sensor Busy Sensor command sequence is busy new values are not valid 8 0x0100 Encryption Enabled Encryption key is non zero data records will be encrypted 9
36. 2 data types this register specifies the number of coils or discrete inputs to read Each coil or discrete input is represented as a single bit and is packed 16 bits per register in the data record beginning at the least significant bit of each register For holding register 3 and input register 4 data types this register specifies the number of registers to read Each register read is added sequentially to the data record A maximum of 64 registers can be specified across all read register commands If the sensor returns an exception to the Read Registers command the sentinel value will be recorded for each requested register 7 6 8 5 MODBUS Response Timeout The response timeout specifies the maximum amount of time the device should allow for the sensor to make a measurement and respond to the command If a response is not received within the specified timeout the device will retry the command if specified If no response is received after the specified number of retries the sentinel value will be recorded for each requested register 43 PWS 600 User s Manual 7 6 9 SDI 12 Command Group Format The following table defines the sensor command group for a smart sensor network configured to use the SDI 12 protocol Each register in the table is an offset from the first register of the sensor command group as specified in the Data Log Configuration Registers Table SDI 12 Sensor Command Group Regist
37. A ADDRESS exception code e fthe Write Multiple Registers function code is used to write a multiple register data type the start register address must be of the first register in the field and the number of registers must include all registers in the field If one or both parameters are invalid the device will return an exception response with the ILLEGAL DATA ADDRESS exception code e The Write Multiple Registers function code can be used to write data to multiple registers of the same or different data types In this case the starting register address must be of either a single register data type or the first register in a multiple register data type The last register written must be either a single register data type or the last register in a multiple register data type Attempting to start or end the write within a multiple register data type will result in an exception response with the ILLEGAL DATA ADDRESS exception code e Some registers are designated as read only R versus R W in the register map Attempting to write data to a read only register will result in an exception response with the READ ONLY REGISTER exception code 77 PWS 600 User s Manual e Ifan attempt is made to write an out of range value to a register an exception response with the ILLEGAL WRITE VALUE exception code will be returned e Ifthe function returns an exception response with an exception code of ILLEGAL DATA ADDRESS or READ ONLY REGISTER no data w
38. EGAL DATA ADDRESS exception code e Some registers are designated as write only W versus R W in the register map Attempting to read a write only register the device will result in an exception response with the WRITE ONLY REGISTER exception code The response to a read registers command is typically returned in less than 50 milliseconds 76 PWS 600 User s Manual 8 6 3 Write Multiple Registers This function code is used to write the contents of a contiguous block of registers Command Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 16 0x10 2 Starting Register Address USHORT 0 65535 OxFFFF 4 Number of Registers N USHORT 1 123 0x007B 6 Byte Count BYTE 2xN 7 Register Data 2x N BYTES Response Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 16 0x10 2 Starting Register Address USHORT 0 65535 OxFFFF 4 Number of Registers USHORT N The starting register address is one less than the starting register number The byte count must be two times the number of registers to be written e Ifthe Write Multiple Registers function code is used to write data to a single register the register must be a single register data type such as a USHORT An attempt to write a single register within a multiple register data type will result in an exception response with the ILLEGAL DAT
39. EZ 41 7 6 4 tog nterna ieee iaae a E E 41 7 6 5 Log Offset steterat ete esee teet ise EE eee t cet ue RARA A ei 41 7 6 6 Number of Sensor Commands reete deet ESA 41 7 6 7 S nsor Command GrOUPs EE 42 7 6 8 MODBUS Command Group Format 42 7 6 9 SDI 12 Command Gro p FOrttiat oret rece ree E Y EX van eoe user used o 44 7 6 10 Analog Command Group Format 46 7 6 11 Discrete Command Group Format 49 7 0 12 ast Sensor Readings eege See Eegeregie Se ates 51 7 7 Switched Power Outputs eee eee eter EE Rede e ee beue epe ed edet ave eas AE 52 7 7 1 Switched Output ETC 52 7 7 2 Switched Power Output Configuration eese eene enne nnne enne nins 53 7 8 bPIETsg2ecpa m 55 7 8 1 Discrete OUTPUT StatUs ceret eee reete ree enr eee vere ee ra een Piae v esa ev Yea eee c er e Evae si eunt 55 7 8 2 Discrete Output Configuration recente vtt e rd rie petite patie ates 55 7 9 Data Log Recording Registers Jj reete e OR UE ven ad oe NEE EAER 57 7 9 1 Encryptlon Key cnc etn ia aede ueque et repeto quede se dp ede eque edet 57 7 9 2 Recording Daten EE een eek 57 7 9 3 Recording SPCC WE 58 7 10 Data Log Retrieval Registers ccccccccccccssssssssececececeeseseeaeseeeesceesesaeaesesecsseesasaeeeesessseseaeaeeeeeess 59 7 101 Data VOR SIZE E E 59 7 10 2 Data Log Used 5 imei tt tie estate caste a arce sessanta tei e dox 59 7 10 3 Lowest and Highest Record Numbers
40. S 600 User s Manual 6 4 Configure the Sensor Networks Refer to section 7 5 to configure the sensor networks to match the sensor requirements The Prairie View software helps to automate this process however the configuration registers can also be written directly using third party software tools 6 5 Configure the Data Log The data log configuration registers must be programmed so that the PWS 600 will know how to acquire data from the sensors and at what interval refer to section 7 6 The Prairie View software helps to automate this process however the configuration registers can also be written directly using third party software tools Once the log is configured set the Log Enable register to one to start logging Data is then acquired and logged at the specified interval The most recent acquisition from the sensors is available in the data log polling registers 20 PWS 600 User s Manual 7 Register Map The PWS 600 uses the MODBUS Holding Registers data model exclusively All of the device functionality is accessed using the MODBUS read and write holding register commands The organization of the register map is kept consistent among Prairie Wind System devices as much as practical 7 1 Device Configuration Registers The device configuration registers identify the device its site location and its basic configuration Device Configuration Registers Register
41. Sensor Command 29 1741 8 USHORT R W Sensor Command 30 1749 8 USHORT R W Sensor Command 31 1757 8 USHORT R W Sensor Command 32 7 6 1 Log Enable This non volatile register can be set to one of the following values Attempting to write any other value will result in an exception response with the ILLEGAL WRITE VALUE exception code 0 Data log disabled The next scheduled record registers will return zero The data log configuration can be edited 1 Data log enabled The next scheduled record registers will return the date and time of the next scheduled log record per the defined schedule Data log configuration registers are read only and cannot be edited Attempting to write a log configuration register while the data log is enabled or paused will result in an exception response with the READ ONLY REGISTER exception code 7 6 2 Log Pause Use this register to pause the data log for a specified period of time such as when pass through access to a sensor is necessary for calibration or maintenance This register can only be written when the data log is enabled When the data log is disabled this register will return zero Writing a value from 1 to 65535 will pause the data log for the specified number of seconds While paused the next scheduled record registers will return zero the data log configuration registers remain read only and cannot be edited and pass through communication is enabled Data logging will resume
42. a 500 millisecond delay the PWS 600 will begin to stream the number of records specified by the download record count beginning at the record specified by the record number register If the download record count is set to zero the download will continue uninterrupted to the highest record number Each record is constructed as a standard MODBUS read registers response that begins at the record number register and contains all registers in the record There will be little or no delay between records 5 After all records have been sent the PWS 600 will send an exception response with the END DOWNLOAD exception code 6 The master device must be capable of receiving records back to back until it detects the END DOWNLOAD exception The user should consider the following when using this command to download data e There is no handshaking The master device must be capable of receiving records back to back with little or no delay between records Since the record number is included in each record sent and each record contains a CRC or LRC the master device can determine if any records were missed e Onthe RS485 port there is no way to cancel the command The PWS 600 will stream data until itis done The network is unavailable for any other communication until the download is finished e fthe PWS 600 encounters a corrupt record during the download it will send an exception response with the CORRUPT DATA RECORD exception code in place of the cor
43. a log has wrapped around and or has been erased 68 PWS 600 User s Manual 8 MODBUS Protocol The PWS 600 utilizes the MODBUS over Serial Line protocol for communication over an RS485 network The MODBUS Serial Line protocol is a half duplex master slave protocol One master device controls the network or link and is connected to one or more slave devices A MODBUS transaction is always initiated by the master device Slave devices never transmit data without first receiving a request from the master device Slave devices never communicate with each other The master device only initiates one MODBUS transaction with one slave device at a time The PWS 600 implements the functions of a slave device in the protocol The MODBUS standard defines two serial transmission modes RTU mode and ASCII mode All devices connected to a network must be configured to use the same transmission mode and communication parameters This device supports both transmission modes 8 1 RTU Transmission Mode The MODBUS RTU Remote Terminal Unit transmission mode is an 8 bit byte oriented binary protocol with timing based message framing The RTU mode is the default transmission mode for the device 8 1 1 RTU Character Format The standard format for each character in an RTU message is as follows 1 2 3 4 5 6 7 8 9 10 11 Start Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Parity Stop The 11 bit character is s
44. an be achieved Setting this register to zero disables excitation outputs they will not be turned on during measurements 37 PWS 600 User s Manual 7 5 4 Discrete Sensor Network The discrete sensor network requires no configuration at this time A group of eight registers is reserved to support future configuration options These eight registers must be read and written within a single command The register block may not be written when logging is enabled Attempting to write the register block when logging is enabled will generate an exception response with the READ ONLY REGISTER exception code Discrete Sensor Network Configuration Group Register Size Data Default Offset Registers Type Access Name Value 1833 1 USHORT R W Reserved 0 1834 1 USHORT R W Reserved 0 1835 1 USHORT R W Reserved 0 1836 1 USHORT R W Reserved 0 1837 1 USHORT R W Reserved 0 1838 1 USHORT R W Reserved 0 1839 1 USHORT R W Reserved 0 1840 1 USHORT R W Reserved 0 38 PWS 600 User s Manual 7 6 Data Log Configuration Registers These registers set the polling and data log schedule All data log configuration registers are non volatile Data Log Configuration Registers Register Size Data Default Number Registers Type Access Name Value 1500 1 USHORT R W Log Enable 0 disabled 1 enabled 0
45. as the PWS 600 The SDI 12 specification calls for a 12 volt DC supply that operates between 9 6 and 16 volts Failure to observe the input voltage limits of a sensor can result in permanent damage to the sensor and or the PWS 600 5 6 Charging Requirements The PWS 600 contains a built in charge controller for charging a 12 volt sealed lead acid SLA battery rated between 2 3 and 7 0 amp hours Caution Attempting to charge any battery type other than a 12 volt sealed lead acid battery may present an explosion hazard Caution Attempting to charge an SLA battery rated less than 2 3 amp hours may cause the maximum battery charge current to be exceeded which can damage the battery and may present an explosion hazard Caution If the battery charger is used the field enclosure must be vented so that charge gasses from the battery do not accumulate Failure to do so may present a risk of explosion Attempting to charge an SLA battery rated greater than 7 0 amp hours may not fully charge the battery reducing the battery life and leaving the system susceptible to brown out conditions The charge controller is optimized for use with a solar panel in the 10 watt range with a 15 to 32 volt output however any comparable DC source such as a mains connected DC power supply can be used Connect the positive side of the solar panel or charging supply to the CHG terminal Connect the negative side of the solar panel or charging supply to the CHG termi
46. as written to any of the registers e Ifthe function returns an exception response with an exception code of ILLEGAL WRITE VALUE or DEVICE FAILURE data was written to registers up to but not including the register that caused the exception No data was written to registers after the register that caused the exception There is no provision in the exception response to isolate the problem register The response to a write multiple registers command is typically returned in less than 100 milliseconds 8 6 4 Write Single Register This function code is used to write the contents of a single register Only single register data types can be written with this function Writing to a multiple register data type requires the Write Multiple Registers function code Command Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 6 0x06 2 Register Address USHORT 0 65535 OxFFFF 4 Register Data USHORT 0 65535 OxFFFF Response Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 6 0x06 2 Register Address USHORT 0 65535 OxFFFF 4 Register Data USHORT 0 65535 OxFFFF The register address is one less than the register number e An attempt to write a single register within a multiple register data type will result in an exception response with the ILLEGAL DATA ADDRESS exception code e Some registers are designa
47. ations The PWS 600 is specified for operation in a non condensing humidity environment When temperature and or humidity tolerances are exceeded damage to internal components and or measurement inaccuracies due to condensation may result The device must be housed in an enclosure suited for field use The environmental ratings of the device s enclosure are intended as a backup to the primary field housing The field housing should contain desiccant that is replaced or dried frequently enough to control the humidity Effective control of the humidity is the user s responsibility Caution If the battery charger is used the field enclosure must be vented so that charge gasses from the battery do not accumulate Failure to do so may present a risk of explosion 5 2 Mounting the Device Mounting flanges are integral to the device s enclosure Six mounting holes sized for 4 screws are provided Two or more screws should be used to mount the enclosure 34 6 62 16 81 em A 3 30 2 78 8 38 cm 7 06 cm en 6 10 15 49 cm 13 PWS 600 User s Manual 5 3 Connector Pin Out The PWS 600 uses a standard 44 pin D subminiature socket The sockets on the face of the connector are numbered as shown below This is also the pin out looking at the wiring side of the mating 44 pin D sub plug Se e 9 e e e e 9 e e e e e e 1 Ven E EN 15 30 wee 8 2 8 SSS 8S es 8 The function of each pin is
48. be recorded 1 to 64 to register 1320 Attempting to write a value outside this range will result in an exception response with the ILLEGAL WRITE VALUE exception code 2 Write data registers beginning at register 1321 Only the number of data registers specified by the register count can be written Attempting to write more data registers than specified by the register count will result in an exception response with the ILLEGAL ADDRESS VALUE exception code Asingle Write Multiple Registers function can be used to write the register count and the data registers in one transaction 57 PWS 600 User s Manual 3 When the last data register is written as determined by the register count the device will write the record to the data log along with the time site id device id device serial number device status ambient temperature and input voltage The typical response time to this write is less than 100 milliseconds The maximum response time is 3 seconds The register count and data registers are write only to protect unencrypted data from being read One of the primary purposes of allowing the MODBUS master device to write data asynchronously to the logged sensor data is to be able to insert notes Notes can be in any suitable format ASCII packed ASCII Unicode etc however for easy decoding of the log data the record size register count of the notes should be something different than the record size of the sensor data records
49. ce All other function codes will generate an exception response with the ILLEGAL FUNCTION exception code 8 6 1 Report Slave Id This function code is used to read the device description All of the device specific information is also available in the register map and is detailed in that section Command Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 17 0x11 Response Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 17 0x11 2 Byte Count BYTE 18 3 Slave Id BYTE 80 0x50 P 4 Run Status Indicator BYTE 255 OxFF ON 5 Slave Id Version USHORT 1 7 Device Id USHORT 600 9 Serial Number ULONG 13 Firmware Version USHORT 15 Boot Code Version USHORT 17 Hardware Version USHORT 19 Register Map Version USHORT The response to a slave id command is typically returned in less than 50 milliseconds 8 6 2 Read Registers This function code is used to read the contents of a contiguous block of registers Command Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 3 0x03 2 3 Starting Register Address USHORT 0 65535 OxFFFF 4 5 Number of Registers N USHORT 1 125 0x007D 6 CRC Low BYTE 7 CRC High BYTE 75 PWS 600 User s Manual Response Byte Offset Field Descriptio
50. consider VEX amp AGND for excitation 32 AIN4 AIN3 500 mV Differential consider VEX amp AGND for excitation 33 AIN6 AINS 500 mV Differential consider VEX amp AGND for excitation 34 AIN2 AIN1 250 mV Differential consider VEX amp AGND for excitation 35 AIN4 AIN3 250 mV Differential consider VEX amp AGND for excitation 36 AIN6 AINS 250 mV Differential consider VEX amp AGND for excitation 37 AIN2 AIN1 125 mV Differential consider VEX amp AGND for excitation 38 AIN4 AIN3 125 mV Differential consider VEX amp AGND for excitation 39 AIN6 AINS 125 mV Differential consider VEX amp AGND for excitation 40 AIN2 AIN1 60 mV Differential consider VEX amp AGND for excitation 41 AIN4 AIN3 60 mV Differential consider VEX amp AGND for excitation 42 AIN6 AINS 60 mV Differential consider VEX amp AGND for excitation 43 AIN2 AIN1 30 mV Differential consider VEX amp AGND for excitation 44 AIN4 AIN3 30 mV Differential consider VEX amp AGND for excitation 45 AIN6 AINS 30 mV Differential consider VEX amp AGND for excitation 46 AIN5 AGND Oto20 5mA Current loop jumper AIN5 to LOOP1 consider BAT or SWBATx for power 47 AIN6 AGND Oto20 5mA Current loop jumper AIN6 to LOOP2 consider BAT or SWBATx for power 48 AINA AGND 50 to 200 C 2 wire Pt1000 Platinum RTD jumper AIN4 to REX One wire to AIN4 one wire to AGND 49 AIN4 AIN3 50 to 200 C 4 wire Pt1000 Platinum RTD jumper AIN5 to REX Power pair to AINS and AGND
51. crete output configuration group Each register in the table is an Offset from the first register in the group as specified in the Discrete Output Registers Table Registers in this group may be accessed individually or as a group Discrete Output Configuration Group Register Size Data Default Offset Registers Type Access Name Value 0 1 USHORT R W Discrete Output Mode 0 1 1 USHORT R W Data Record Offset 0 to 63 0 2 1 USHORT R W Data Record Data Type 0 3 2 FLOAT R W Alarm Threshold 0 5 1 USHORT R W Hysteresis 0 to 10 in 0 1 increments 0 55 PWS 600 User s Manual 7 8 2 1 Discrete Output Modes The output mode specifies how the discrete output will be controlled Output Mode Value Description 0 Always Off 1 High Alarm 2 Low Alarm 3 Always On When High Alarm is selected the device will turn on the discrete output if the assigned logged value is greater than or equal to the programmed alarm threshold The output will be turned off when the assigned logged value returns below the alarm threshold minus the hysteresis setting When Low Alarm is selected the device will turn on the discrete output if the assigned logged value is less than or equal to the programmed alarm threshold The output will be turned off when the assigned logged value returns above the alarm threshold plus the hysteresis setting On Always turns the out
52. cted the device will turn the switched power output on and off as specified by the schedule register bits independent of the log schedule In this mode the measurement warm up delay is not used This mode may be used to control external interface equipment such as a cellular modem that may draw too much power to be left on continuously On Always turns the output on continuously Combined with the Off mode this mode permits remote control or test of a switched power output 53 PWS 600 User s Manual 7 7 2 2 Switched Output Schedule These nine registers comprise 144 bits each representing a 10 minute interval of the day Bit 0 of the first register offset 2 represents 00 00 00 to 00 09 59 Bit 15 of the last register offset 10 represents 23 50 00 to 23 59 59 For each bit that is set the output will be turned on during the corresponding 10 minute interval each day The following table illustrates the bit mapping of the schedule registers Switched Output Schedule Register Bit Start Times UTC Register Bit 15 Bit 12 Bit 9 Bit 6 Bit 3 Bit O Offset 2 02 30 02 00 01 30 01 00 00 30 00 00 3 05 10 04 40 04 10 03 40 03 10 02 40 4 07 50 07 20 06 50 06 20 05 50 05 20 5 10 30 10 00 09 30 09 00 08 30 08 00 6 13 10 12 40 12 10 11 40 11 10 10 40 7 15 50 15 20 14 50 14 20 13 50 13 20 8 18 30 18 00 17 30 17 00 16 30 16 00 9 21 10 20 40 20 10 19 40 19 10 18 40 10 23 50 23 20 22 50 22 20 21 50 21 20
53. cured with a password it cannot be accessed without the original password 7 12 2 Login Password Writing a 10 register password that matches the Security Password will temporarily take the device out of the security mode Logging in with a password that does not match the security password will result in an exception response with the ILLEGAL WRITE VALUE exception code and if the device is in the security mode the device will remain in the security mode 66 PWS 600 User s Manual 7 13 Diagnostic Registers These registers provide device diagnostic and troubleshooting information Device Description Register Size Data Default Number Registers Type Access Name Value 9000 1 USHORT R Configuration Flash Writes lt 50 000 9001 1 USHORT R Last Reset Type 0 9002 1 USHORT R Fault Count 0 9003 1 USHORT R Last Fault Type 0 9004 1 USHORT R Last Fault Information 0 9005 1 SHORT R High Temperature Cx 10 9006 1 SHORT R Low Temperature C x 10 9007 1 USHORT R Data Log Chip Id 8214 or 9538 9008 1 USHORT R Data Log Erasure Count 50 000 7 13 1 Configuration Flash Writes This non volatile register records the number of times the device configuration registers have been written to Since these registers are intended for occasional configuration of the device a high number indicates frequent changes and possibly improper use of the registers 7 13 2 Last Reset Type Thi
54. described in the following table Pin Name Description 1 CTS RS232 CTS output to pin 8 of a 9 pin D sub plug 2 DTR RS232 DTR input from pin 4 of a 9 pin D sub plug 3 GND RS232 GND to pin 5 of a 9 pin D sub plug 4 CHG Positive side of solar panel charge input parallel with pin 19 5 CHG Negative side of solar panel charge input parallel with pin 20 6 BAT Positive side of battery or power input parallel with pin 21 7 BAT Negative side of battery or power input parallel with pin 22 8 SWBAT1 Switched power output 1 parallel with pin 23 9 SWBAT2 Switched power output 2 parallel with pin 24 10 DIO1 Discrete input output port 1 11 DIO2 Discrete input output port 2 12 LED OK Active low 10 mA constant current LED driver for OK status 13 LED CHG Active low 10 mA constant current LED driver for charge status 14 LED LOW Active low 10 mA constant current LED driver for low voltage status 15 LED LOG Active low 10 mA constant current LED driver for log scan status 16 TXD RS232 TXD input from pin 3 of a 9 pin D sub plug 17 RXD RS232 RXD output to pin 2 of a 9 pin D sub plug 18 DCD RS232 DCD output to pin 1 of a 9 pin D sub plug 19 CHG Positive side of solar panel charge input parallel with pin 4 20 CHG Negative side of solar panel charge input parallel with 5 21 BAT Positive side of battery or power input parallel with pin 6 22 BAT Negative side of
55. e 1 to 4 3 3 1 USHORT R W Start Register Number 1 to 65535 1 4 1 USHORT R W Number of Registers 1 to 64 1 5 1 USHORT R W Response Timeout milliseconds 1000 6 1 USHORT R W Reserved 0 7 1 USHORT R W Reserved 0 Each sensor command generates a MODBUS read command for the specified data type The data read from the sensor are added to the current data record If several non sequential registers or data types need to be read from a sensor multiple read register commands can be sent to the same sensor 42 PWS 600 User s Manual 7 6 8 1 MODBUS Sensor Address This register specifies the sensor s network address 7 6 8 2 MODBUS Data Type This register specifies the data type to be read from the sensor according to the following table MODBUS Sensor Command Data Types Register MODBUS Data Type Value 1 Coils 2 Discrete Inputs 3 Holding Registers 4 Input Registers The default value is 3 to read holding registers Attempting to write a value not in the table will result in an exception response with the ILLEGAL WRITE VALUE exception code 7 6 8 3 MODBUS Start Register Number For coils 1 and discrete input 2 data types this register specifies the first coil or discrete input to read For holding register 3 and input register 4 data types this register specifies the first register number to read 7 6 8 4 MODBUS Number of Registers For coils 1 and discrete input
56. e of consecutive registers where each byte within a register represents an 8 bit ASCll encoded character A string of N characters requires N 2 registers When reading or writing a string all characters in the string must be transmitted If the string to be written does not require the full available length the unused characters must be padded with zeroes Register Byte 1 Byte 2 Character 1 Character 2 Register 1 Byte 1 Byte 2 Character 3 Character 4 Register N 2 1 Byte 1 Byte 2 Character N 1 Character N 8 5 7 TIME Date and Time Time is represented by 16 packed BCD digits contained in 4 consecutive registers The registers are organized with the most significant temporal digit first ranging from 1000 years to 0 01 seconds Only BCD digits 0 to 9 are used Time is in the 24 hour format Register Byte 1 Byte 2 1000 years 100 years 10 years Year Register 1 Byte 1 Byte 2 10 Months Month 10 Days Day Register 2 Byte 1 Byte 2 10 Hours Hour 10 Minutes Minutes Register 3 Byte 1 Byte 2 10 Seconds Seconds 0 1 Seconds 0 01 Seconds 74 PWS 600 User s Manual 8 6 Function Codes The MODBUS Protocol defines a variety of standard function codes for reading and writing data to a device Only the function codes described in this section are supported by the devi
57. e that must elapse before the device recognizes the end of an RTU message The default value of zero signifies a timeout that is selected automatically based on the selected baud rate as described in the RTU Message Format section If any slave device on the network is unable to meet the default timing requirements a fixed timeout from 5 to 50 milliseconds may be specified The default setting is zero 7 5 1 4 Network Wake Delay Some sensors may enter a low power mode if no network activity is detected for some period of time While in this mode the sensor may not respond immediately to the first command it receives To accommodate sensors with this behavior the device can be programmed to wake the sensor network before starting requests for data 30 PWS 600 User s Manual If the Network Wake Delay is set to a non zero value the device will broadcast a Report Slave Id command on the sensor network This will generate network activity that will cause sensors to exit their low power mode Because this is a broadcast of a read command sensors should not respond to the command The device will then delay the number of milliseconds specified by the Network Wake Delay register before requesting data from the sensors If the Network Wake Delay is set to zero this broadcast message is not sent 7 5 1 5 Retries This register specifies the number of times the device is to resend a command if a sensor does not respond within the time
58. ected automatically based on the selected baud rate as described in the RTU Message Format section If the master device is unable to meet the default timing requirements a fixed timeout from 5 to 50 milliseconds may be specified The register is non volatile If ASCII mode is selected this register specifies the maximum time that may elapse between characters within a message when the ASCII transmission mode is selected Intervals exceeding the timeout value will cause the device to assume an error has occurred and discard the message The valid range for the timeout in ASCII mode is 1000 to 60000 milliseconds 1 to 60 seconds The recommended setting for most applications is 1000 milliseconds 7 4 3 Sleep Timeout This register specifies the amount of time allowed to elapse with no network activity before the device enters its low power sleep mode The valid range for the timeout is 0 or 1000 to 60000 milliseconds 1 to 60 seconds A value of zero disables the low power sleep mode The register is non volatile After the device enters its sleep mode any activity detected on the network will cause the device to wake however the contents of the first message will most likely be missed If this first message was a command addressed to the device the master device will receive no response and must retry the command Afterwards as long as there is network activity more frequent than the sleep timeout setting the device will remain awake and proc
59. emperatures cccsssssccceceesssenneaeeeeecesseseaeseeeescssseeeaeeeeeessessesesaeeeesesseeeegs 68 7 135 Data Log Chip Idrees eresien tec ER erste eege eege 68 7 13 6 Data Log Erasure Count eh ed E EEE guis RRES 68 jvrelpi Bd eedem EM 69 8 1 RIU Transmission MOGe rre te dette tree eite ao cud E Persa ge lese aa epp acea REN ve EES 69 8 1 1 RTU Character Format TT DER 69 8 1 2 RITU Message Fortmat eerte RR EERSTEN ENEE AER edel 70 8 2 ASCII Transmission Me i cioe erret ren eeu Seege xd eee aerea eden aa 70 8 2 1 eelere el EE 70 8 2 2 ASCII Message Format AANEREN EEN EEN EEN 71 8 3 MODBUS IP Em 72 8 4 Device Addressing eoe eer en ie te etre t nete P eR n EE v ege adele 72 8 5 Data Ty IIS ARR 72 8 5 1 USHORT Unsigned SNOM ertt eri retreat eta ree ENE AA RATEN EEKAN AUSA Aia 72 8 5 2 SHORT Signed LTE 73 8 5 3 ULONG Unsigned LOTig cci eorr eege e Rete eve eet eege 73 8 5 4 LONG Signed EE 73 8 5 5 FLOAT Floating Bopen ect etre EHE bee eee I pete ee vd oett aee ea uda 73 8 5 6 STRING Character String dee ri e Oed edi OPE Deeds 74 8 5 7 TIME hen 74 8 6 Fungon Colas arraro m 75 8 6 1 Report ET ME 75 8 6 2 e RE 75 8 6 3 Vigel EE 77 8 6 4 Write Single ET 78 8 6 5 Exception RESPONSE serei edited Eed eg RE 79 PWS 600 User s Manual 1 Regulatory Information The PWS 600 has been tested and approved to be compliant to the following regulatory standards e EN61326 1 2006 for immunity in indust
60. ent least significant bit first left to right as shown with 1 start bit 8 data bits a parity bit and one stop bit The default parity of the device is even parity Odd parity and no parity are also supported When no parity is specified 2 stop bits should be used so that the 11 bit character size is maintained 1 2 3 4 5 6 7 8 9 10 11 Start Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Stop Stop 69 PWS 600 User s Manual 8 1 2 RTU Message Format An RTU message is comprised of a sequence of 4 to 256 characters transmitted in a continuous stream No more than 1 5 character times should be permitted between the characters ina message The format of a message is as follows Slave Address Function Code Data CRC 1 byte 1 byte 0 to 252 bytes 2 bytes By default for baud rates less than or equal to 19200 an idle time of 3 5 character times signifies the end of a message For baud rates higher than 19200 an idle time of 1 75 milliseconds signifies the end of a message The RTU mode uses a Cyclical Redundancy Check CRC to provide error checking across a message from the slave address to the last data byte Only the eight data bits of each character are used in generating the CRC start and stop bits and the parity bit do not apply The CRC field is a 16 bit value The low order byte is appended first followed by the high order byte The high order byte of t
61. er Size Data Default Offset Registers Type Access Name Value 0 1 USHORT R W Sensor Network 1 or 2 in SDI 12 mode 1 1 1 USHORT R W Sensor Address 48 2 1 USHORT R W Measurement Command 0 3 2 ULONG R W Measurement Selection Bit Mask 1 5 1 USHORT R W Reserved 0 6 1 USHORT R W Reserved 0 7 1 USHORT R W Reserved 0 Each sensor command generates the specified measurement command reads the sensor response then adds a FLOAT type value to the current data record for each selected measurement 7 6 9 1 SDI 12 Sensor Address This register specifies the sensor s network address SDI 12 addresses are ranges of ASCII characters as defined in the following table Address 0 is the default sensor address initially set by the manufacturer as defined by the SDI 12 specification All sensors are required to support the address range O to 9 The other address ranges are optional and might not be supported by all sensors SDI 12 Sensor Address Ranges ASCII Decimal Hexadecimal Description o 48 0x30 Default 1 to 9 49 to 57 0x31 to 0x39 Standard Support A to Z 65 to 90 0x41 to 0x5A Optional Support a to z 97 to 122 0x61 to 0x7A Optional Support Attempting to write any other value will result in an exception response with the ILLEGAL WRITE VALUE exception code 44 PWS 600 User s Manual 7 6 9 2 SDI 12 Measurement Command This regi
62. ess commands Note The sleep timeout takes precedence over the message timeout If the sleep timeout is used non zero it should be set greater than or equal to the message timeout 7 4 4 Message Counters The message counter registers provide diagnostic information for troubleshooting communication problems Each counter is reset by writing it to zero The counters roll back to zero after the maximum count value of 65535 is reached The registers are volatile and will reset to zero if power is removed The Good Message Counter counts properly formatted messages that are addressed to the device The Bad Message Counter tracks the number of improperly formatted messages such as those with a bad CRC The Exception Response Counter counts the number of messages received that were rejected with an exception response 28 PWS 600 User s Manual 7 5 Sensor Networks The PWS 600 uses the concept of sensor networks to organize its sensor data logging features Four sensor networks are provided numbered as shown below 1 RS485 Smart Sensor Network 2 SDI 12 Smart Sensor Network 3 Analog Sensor Network 4 Discrete Sensor Network Each sensor network has features common to all sensors on that network and it is these features that are discussed in this section The data log configuration sensor command group registers specify how to access and log sensors on a network 7 5 1 RS485 Smart Sensor Network RS485 sensor communicat
63. he CRC is the last byte in the message A slave device will not act on or respond to a message that has an invalid CRC or parity errors The master device must discard a slave response with an invalid CRC or parity errors and either resend the message or generate an error Techniques for calculating the CRC can be found in the document MODBUS over Serial Line Specification and Implementation Guide V1 02 available at modbus ida org 8 2 ASCII Transmission Mode In the MODBUS ASCII transmission mode each 8 bit byte in a message is sent as two hexadecimal ASCII characters The message is also framed with unique ASCII characters This mode is preferred when the communication link cannot guarantee the inter character timing required by the RTU mode such as a packet based wireless link 8 2 1 ASCII Character Format The standard format for each character in an RTU message is as follows 1 2 3 4 5 6 7 8 9 10 Start Bit O Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Parity Stop The 10 bit character is sent least significant bit first left to right as shown with 1 start bit 7 data bits a parity bit and one stop bit The default parity of the device is even parity odd parity and no parity are also supported When no parity is specified 2 stop bits should be used so that the 10 bit character size is maintained 1 2 3 4 5 6 7 8 9 10 Start Bit O Bit 1 Bi
64. hed outputs will always be indicated as off Switched Output States Bits Description O0 Off 01 Fault output shorted or overloaded 10 Marginal output lt 90 of expected 11 On 52 PWS 600 User s Manual 7 7 2 Switched Power Output Configuration The following table defines the switched power output configuration group Each register in the table is an offset from the first register in the group as specified in the Switched Power Output Registers Table Registers in this group may be accessed individually or as a group Switched Power Output Configuration Group Register Size Data Default Offset Registers Type Access Name Value 0 1 USHORT R W Switched Output Mode 0 1 1 USHORT R W Measurement Warm up Delay ms 0 2 9 USHORT R W Switched Output Schedule 0 7 7 2 1 Switched Output Modes The output mode specifies how the switched power output will be controlled Output Mode Description Value 0 Always Off 1 On to Measure 2 On by Schedule 3 Always On When On to Measure is selected the device will turn on the switched power output prior to taking a sensor measurement of any kind wait the specified measurement delay and then take the measurements specified by the log commands This mode is used to control power to sensors that draw too much current to be left on continuously When On by Schedule is sele
65. hese registers hold the current date and time as a TIME data type The device is programmed to Universal Coordinated Time UTC at the factory and generally does not need to be adjusted If the clock should require adjustment it is recommended that UTC continue to be used as the clock does not provide for automatic adjustments for local Daylight Savings Time The time stamps of stored data may be post processed to any local time as needed for reporting or analysis When setting the clock the year must be in the range 2000 to 2399 Leap years in this range are correctly handled Attempting to write an invalid date or time will generate an exception response with the ILLEGAL WRITE VALUE exception code Setting the clock will clear the clock fault bit and set the clock adjusted bit in the status register 26 PWS 600 User s Manual 7 4 Communication Configuration Registers These registers specify the communication configuration of the master RS485 and RS232 ports Communication Configuration Registers Register Size Data Default Number Registers Type Access Name Value 1101 1 USHORT R W Communication Settings 276 1102 USHORT R W Message Timeout ms 1103 USHORT R W Sleep Timeout ms 1105 USHORT R W Bad Message Counter 1 1 1104 1 USHORT R W Good Message Counter 1 1 oO CO oO CO oO 1106 USHORT R W Exception Response Counter 7 4 1 Communication Settings This register se
66. ill no response is received all values that we expected to be received will be logged with the SDI 12 sentinel value 7 5 1 18 Sentinel Value The sentinel value is written in place of the measurement value for all sensor measurements that cannot be read by a command This will occur if an SDI 12 sensor fails to respond to a command or if a command is improperly structured to log more measurements than the sensor will return 7 5 1 19 Message Counters The message counter registers provide diagnostic information for troubleshooting communication problems Each counter is reset by writing it to zero The counters roll back to zero after the maximum count value of 65535 is reached The registers are volatile and will reset to zero if power is removed The Good Message Counter counts properly formatted messages that are returned to the device The Bad Message Counter tracks the number of improperly formatted messages such as those with a bad CRC The Exception Response Counter counts the number of messages that received no response 7 5 2 SDI 12 Smart Sensor Network The SDI 12 sensor network is a dedicated SDI 12 port that only supports the SDI 12 protocol SDI 12 signals are available on terminal block TB8 labeled SDI 12 SENSORS Three signals are used for power ground and data The data line is a bidirectional tri state signal using 5 volt logic that is capable of driving up to 10 SDI 12 sensors The maximum length of cable between the PWS 60
67. ion uses the signals on terminal block TB9 labeled RS485 SENSORS The terminal block provides terminals for power ground and the RS485 transceiver signals 485B is the positive transceiver signal and 485A is the negative transceiver signal The 485B signal is provided with a 4 75K ohm resistor to the device s internal 43 3 volt supply The 485A signal is provided with a 4 75K ohm termination resistor to GND No signal termination resistor is provided internally In most low power applications no additional termination resistor is necessary If required a resistor may be added externally The maximum offset of the signals from the GROUND at pin 1 is 7 volts Both signals are transient protected The RS485 sensor network can be configured to operate using one of three protocols MODBUS RTU MODBUS ASCII or SDI 12 A group of eight registers define and configure the network protocol These eight registers must be read and written within a single command The format of these eight registers varies based on the selected network protocol The register block may not be written when logging is enabled Attempting to write the register block when logging is enabled will generate an exception response with the READ ONLY REGISTER exception code 7 5 1 1 MODBUS RTU Sensor Network Configuration The following table defines the RS485 sensor network configuration registers when configured to use the MODBUS RTU protocol RS485 Sensor Network Configuration
68. lue The sentinel value is written in place of the data values for all registers that cannot be read by a command This will occur if a sensor fails to respond to a read register command or if the sensor returns an exception response 7 5 1 14 Message Counters The message counter registers provide diagnostic information for troubleshooting communication problems Each counter is reset by writing it to zero The counters roll back to zero after the maximum count value of 65535 is reached The registers are volatile and will reset to zero if power is removed The Good Message Counter counts properly formatted messages that are returned to the device The Bad Message Counter tracks the number of improperly formatted messages such as those with a bad CRC The Exception Response Counter counts the number of messages that were rejected with an exception response 33 PWS 600 User s Manual 7 5 1 15 SDI 12 over RS485 Sensor Network Configuration The following table defines the RS485 sensor network configuration registers when configured to use the SDI 12 protocol RS485 Sensor Network Configuration Group Register Size Data Default Offset Registers Type Access Name Value 1803 1 USHORT R W Communication Settings 2048 1804 1 USHORT R W_ Break Retries 0 to 5 2 1805 1 USHORT R W Command Retries 0 to 5 2 1806 2 FLOAT R W Sentinel Value 99999 1808 1 USHORT R W Good Message Counter 0 1809 1 USHORT R W
69. me clock Every data record is date and time stamped Polling and logging are synchronized to the real time clock making it easy to align data collection across multiple systems e The PWS 600 includes a built in solar charge controller compatible with standard 12 volt sealed lead acid batteries reducing a system s overall cost and complexity e The device s ambient temperature and input voltages are logged with every data record for enhanced data tracking and system troubleshooting particularly in battery operated systems The user can track battery and recharging performance in standalone and solar charged systems The Prairie View Software that comes with the device provides a convenient means to configure the device and manage its data log PWS 600 User s Manual 4 Specifications Case Description ABS plastic with integral mounting flanges Dimensions 6 62 L x 3 30 W x 1 30 H 16 8 x 8 4 x 3 3 cm including flanges and connector Weight 6 1 oz 173 6 g Ratings IP 66 and NEMA 4X Connector 44 pin D sub socket Environmental Operating Temperature 40 to 70 C 40 to 158 F Operating Humidity 5 to 95 RH non condensing Storage Temperature 40 to 80 C 40 to 176 F Battery Input Input Voltage 8 to 32 Vdc Transient Protection 250 Watts Peak Sleep Current lt 500 pA typical at 13 5 Vdc RS485 and RS232 networks inactive Idle Curre
70. n SDI 12 command to a sensor and obtain the response 1 Write the packed ASCII command beginning at register 2001 Each register contains two ASCII characters with the upper byte of the register holding the leading character The command must begin with the SDI 12 address and end with the character No other validation of the command format is performed allowing sensor specific extended commands to be sent 2 Write device command 56481 to the device command register to send the command to a ap sensor on the SDI 12 network All characters up to and including the character will be sent If the character is not found in the string the command will not be sent 64 PWS 600 User s Manual The Sensor Busy bit in the Device Status register can be monitored to determine when the command response cycle is finished Generally the response of the SDI 12 sensor is faster than the sensor busy status can be checked allowing this step to be skipped The device returns the sensor response in the command response string beginning at register 1801 The original command is overwritten All characters returned by the sensor up to and including the carriage return and line feed character are provided Character positions following the line feed character are padded with zeroes If no response is received from the sensor the entire string will be filled with zeroes 65 PWS 600 User s Manual 7 12 Password Security
71. n Type Value 0 Device Address BYTE 1 247 1 Function Code BYTE 3 0x03 2 Byte Count BYTE 2xN 3 Register Data 2 x N BYTES The starting register address is one less than the starting register number The byte count returned will be two times the number of registers read e If the Read Registers function code is used to read data from a single register the single register must be a single register data type such as a USHORT An attempt to read a single register from within a multiple register data type will result in an exception response with the ILLEGAL DATA ADDRESS exception code e If the Read Registers function code is used to read a multiple register data type the start register address must be of the first register in the field and the number of registers must include all registers in the field If one or both parameters are invalid the device will return an exception response with the ILLEGAL DATA ADDRESS exception code e The Read Registers function code can be used to read data from multiple registers of the same or different data types In this case the starting register address must be of either a single register data type or the first register in a multiple register data type The last register read must be either a single register data type or the last register in a multiple register data type Attempting to start or end the read within a multiple register data type will result in an exception response with the ILL
72. nal If the charging feature is not required the CHG terminals should be left unconnected It is not recommended to use the charger without a battery if a DC power supply is being used instead of a battery it should be connected to the BAT terminals and the CHG terminals left unconnected This will result in the lowest possible power consumption The charger input is reverse polarity and transient protected however sustained operation above 32 volts will damage the device The charger output is protected against a reversed battery and battery voltages higher than 12 volts 16 PWS 600 User s Manual 5 7 Status Indicators The PWS 600 provides four system status indicators The PWS 600T terminal block provides colored LED indicators When power is applied to the device all indicators will light in sequence as a lamp test The status is then displayed for 30 seconds after which the indicators are turned off to conserve power Press the WAKE button to display the status for an additional 30 seconds Note Jumper the WAKE terminal to GND to display status continuously This can be useful in an industrial setting when power consumption is less of a concern or when troubleshooting power problems Three of the LED indicators provide power supply status as shown below ON battery input above low threshold OFF battery input below low threshold OFF no charge input detected OFF nocharge input detected OFF battery input above
73. ncy Check LRC to provide error checking across a message from the slave address to the last data byte The beginning colon and ending CR LF pair are not included in the calculation Only the data bits of each character are used in generating the LRC start and stop bits and the parity bit do not apply The LRC is an 8 bit value encoded with two ASCII characters in the same manner as a data byte A slave device will not act on or respond to a message that has an invalid LRC or parity errors The master device must discard a slave response with an invalid LRC or parity errors and either resend the message or generate an error Techniques for calculating the LRC can be found in the document MODBUS over Serial Line Specification and Implementation Guide V1 02 available at modbus ida org 71 PWS 600 User s Manual 8 3 MODBUS IP This device also supports the MODBUS IP protocol on its master side RS485 port It is provided to support cases where a companion gateway or modem does not support translation between MODBUS IP and either MODBUS RTU or MODBUS ASCII An IP message is essentially a MODBUS RTU message with an extended header Transaction Id Protocol Id Length Slave Address Function Code Data 2 bytes 2 bytes 2 bytes 1 byte 1 byte 0 to 252 bytes The transaction id identifies a MODBUS command response transaction It is uniquely set by the master device and echoed by the slave device The protocol id s
74. nt 500 pA typical at 13 5 Vdc RS485 and RS232 networks inactive Active Current 30 mA typical at 13 5 Vdc not including sensor load currents Battery Charge Controller Input Voltage 15 to 32 Vdc Transient Protection 250 Watts Peak Battery Rating 12 Vdc 2 3 to 7 0 Ahr Sealed Lead Acid Peak Charge Current 1A Charging Temperature 15 to 45 C 5 to 115 F charging disabled outside of this range MODBUS RS485 Transceiver Unit Load 1 8 Termination None Common Mode Range 7 Vdc Transient Protection 250 Watts Peak Protocol Half Duplex MODBUS over Serial Line Transmission Modes RTU ASCII IP Addressing 1 to 247 plus broadcast Baud Rates 1200 2400 4800 9600 19200 38400 57600 Data Bits 7 8 Parity Odd Even None Stop Bits 1 2 PWS 600 User s Manual MODBUS RS232 Transceiver Type 9 pin DTE data terminal equipment Port Power Switched 5V 275 mA Input Voltage Swing 25 Vdc absolute maximum Output Voltage Swing 5 Vdc minimum ESD Protection 15 kV Protocol Half Duplex MODBUS over Serial Line Transmission Modes RTU ASCII IP Addressing 1 to 247 plus broadcast Baud Rates 1200 2400 4800 9600 19200 38400 57600 Data Bits 7 8 Parity Odd Even None Stop Bits 1 2 Smart Sensor RS485 Port Unit Load 1 8 Termination 4
75. olts Attempting to write a value outside this range will generate an exception response with the ILLEGAL WRITE VALUE exception code This threshold also used by the LED indicators to alert the user to a low battery 22 PWS 600 User s Manual 7 2 Device Command Register The device command register is used to issue commands to the device The register is isolated from other registers in the register map to help prevent accidental writing Device Command Register Register Size Data Default Number Registers Type Access Name Value 1065 1 USHORT R W Device Command 0 Writing a value shown in the following table will issue the corresponding device command Attempting to write any other value will generate an exception response with the ILLEGAL WRITE VALUE exception code Reading the register always returns zero Device Commands Value Name Description 56573 OxDCFD Factory Defaults Resets device configuration registers to their factory default values The encryption key is erased and encryption is disabled Does not affect the communication settings the data log or the diagnostic registers This command is not allowed while data logging is enabled 56557 OxDCED Erase Data Log Erases the data log Data cannot be recovered after issuing this command The response message is sent after erasure is complete Typical response time is 30 seconds The maximum response
76. one second less than the log interval Attempting to write a value outside this range will result in an exception response with the ILLEGAL WRITE VALUE exception code Note If writing a new log interval would cause the log offset value to become invalid the log offset will be automatically reset to zero The log offset provides some flexibility in synchronizing daily data records with other system activities For example if the log interval is set to 21600 seconds 6 hours and the log offset is set to 7200 seconds 2 hours the PWS 600 will still collect 4 records per day but the records will be offset to 02 00 00 08 00 00 14 00 00 and 20 00 00 7 6 6 Number of Sensor Commands This register specifies the number of sensor commands that will be used to read data from the sensors Up to 32 commands can be used to read up to 64 registers Sensor commands are executed sequentially beginning with sensor command 1 If zero is specified no commands will be executed only local parameters time site id device id device serial number device status ambient temperature and input voltage will be recorded 41 PWS 600 User s Manual 7 6 7 Sensor Command Groups Each sensor command 1 to 32 consists of a group of 8 registers Each register in the following table is an offset from the first register of the sensor command group as specified in the Data Log Configuration Registers Table Sensor Command Group Registe
77. optional PWS 600T Terminal Block accessory board attaches to the 44 pin connector of the PWS 600 and provides terminal block connections for wiring all signals o seem reeuesen eonun A E G AGND AGND E E E E BAT E CHG ANALOG ANALOG DIGITAL TB ut TCHED E SENSORS SENSORS tQ POWER STATUS LOG x e GI 5m e PHS 6001 ce d 99909090909000000H8 a Ze a gt WAKE 0e990909090909000000 E EI EE CHARGE 00000000000000 A bg Ki e e a LJ OW gH e E TERMINAL BLOCK ar LOW S v o ANALOG LOOP SDi 12 RS485 pus 6 SENSORS RESISTORS SENSORS SENSORS rrr E GE um a s i a Kal a WE a t u n un WE W 1 t t 1 z z E z KE a a z KE x KE a a KE a a Ki eo Ki g a Q Q g q L a a in 1N a 1N 1N a a a a f a a a e ka a e a a e o a a mI 2 t s t sr PWS 600 User s Manual 5 5 Power Requirements The wide battery input voltage range of the PWS 600 permits operation on a 12 volt or 24 volt DC supply The device will automatically shut down if the battery input voltage falls below 7 volts and will resume normal operation when the input voltage rises above 8 volts Sustained operation above 32 volts will damage the device The input is reverse polarity and transient protected Connect the positive side of the battery or supply to the BAT terminal Connect the negative side of the battery or supply to the BAT terminal Caution SDI 12 sensors generally do not operate across the same wide input voltage range
78. or occurred in the device while attempting to perform the command 10 0x0A GATEWAY PATH An attempt was made to use pass through UNAVAILABLE communication while data logging is enabled 79 PWS 600 User s Manual 8 6 5 2 Custom Exception Codes The following exception codes are device specific extensions to the standard codes to help speed command response troubleshooting Exception Code Name Description 128 0x80 READ ONLY REGISTER The command attempted to write data to a read only register 129 0x81 WRITE ONLY REGISTER The command attempted to read data from a write only register 130 0x82 ILLEGAL WRITE VALUE The command attempted to write an illegal or out of bounds value 131 0x83 CORRUPT DATA RECORD The requested data record is corrupted 132 0x84 DOWNLOAD END End of fast data log download 133 0x85 SECURITY MODE The requested function is not available in security mode 80
79. or the timeout is 1000 to 60000 milliseconds 1 to 60 seconds The default setting is 1000 milliseconds 7 5 1 11 Network Wake Delay Some sensors may enter a low power mode if no network activity is detected for some period of time While in this mode the sensor may not respond immediately to the first command it receives To accommodate sensors with this behavior the device can be programmed to wake the sensor network before starting requests for data If the Network Wake Delay is set to a non zero value the device will broadcast a Report Slave Id command on the sensor network This will generate network activity that will cause sensors to exit their low power mode Because this is a broadcast of a read command sensors should not respond to the command The device will then delay the number of milliseconds specified by the Network Wake Delay register before requesting data from the sensors If the Network Wake Delay is set to zero this broadcast message is not sent 7 5 1 12 Retries This register specifies the number of times the device is to resend a command if a sensor does not respond within the timeout specified for that command Zero specifies no retries only one command attempt will be made If the sensor fails to respond to a command after the allowed number of retries the sensor will be considered unresponsive and the sentinel value will be substituted for all registers that were expected by the command 7 5 1 13 Sentinel Va
80. ord number to the record number register The PWS 600 retrieves the record from the data log 3 The master device reads the record size register to determine the number of registers in the record 4 The master device reads the number of registers specified by the size registers beginning with the time register 5 Optionally after the master device has written the record number it can simply read all record registers from the register size through the encryption padding registers and decode the record later 6 The master device repeats steps 2 through 6 until all selected records have been retrieved 7 10 10 Data Log Download Command The following procedure describes the use of the data log download command This command provides considerably faster downloads as compared to conventional register access 1 The master device reads the lowest and highest record number registers to determine the valid record number range 2 The master device writes the first record number to be downloaded to the record number register To download all data set the record number register equal to the lowest record number The PWS 600 has a maximum response time of 1000 milliseconds to this command 61 PWS 600 User s Manual 3 The master device writes the data log download command to the command register The PWS 600 will return a standard response to this write register command with a maximum response time of 1000 milliseconds 4 After
81. out specified for that command Zero specifies no retries only one command attempt will be made If the sensor fails to respond to a command after the allowed number of retries the sensor will be considered unresponsive and the sentinel value will be substituted for all registers that were expected by the command 7 5 1 6 Sentinel Value The sentinel value is written in place of the data values for all registers that cannot be read by a command This will occur if a sensor fails to respond to a read register command or if the sensor returns an exception response 7 5 1 7 Message Counters The message counter registers provide diagnostic information for troubleshooting communication problems Each counter is reset by writing it to zero The counters roll back to zero after the maximum count value of 65535 is reached The registers are volatile and will reset to zero if power is removed The Good Message Counter counts properly formatted messages that are returned to the device The Bad Message Counter tracks the number of improperly formatted messages such as those with a bad CRC The Exception Response Counter counts the number of messages that were rejected with an exception response 31 PWS 600 User s Manual 7 5 1 8 MODBUS ASCII Sensor Network Configuration The following table defines the RS485 sensor network configuration registers when configured to use the MODBUS ASCII protocol RS485 Sensor Network Configuration Group
82. pecifies the transaction protocol It must always be set to zero to specify MODBUS The length field specifies the length of the remaining bytes in the packet including the slave address function code and data 8 4 Device Addressing The MODBUS master device has no specific address only the slave devices have an address Each slave device on a network must be assigned a unique address Slave addresses can range from 1 to 247 Address 0 is reserved as the broadcast address The device will recognize the broadcast address as well as its own address No response is returned to broadcast requests 8 5 Data Types The MODBUS Protocol defines four primary data models Discrete Inputs Coils Input Registers and Holding Registers The PWS 600 uses the Holding Registers model exclusively MODBUS uses big endian representation for register numbers and data items when a numerical quantity larger than a single byte is transmitted the most significant byte is sent first Register data are packed as two bytes per register the first byte contains the high order bits and the second byte contains the low order bits The device extends the big endian representation to data types requiring multiple registers The first register contains the high order bytes and subsequent registers contain the lower order bytes 8 5 1 USHORT Unsigned Short An unsigned short is a 16 bit unsigned integer value in the range 0 to 65535 The value is contained in a single
83. put Low Threshold 2 0 Vdc Input Modes State Switch Closure Pulse Count Frequency Switch Closure Freq 100 Hz maximum Pulse Count 65535 pulses per record Frequency Input 65 kHz maximum 0 02 of reading 1 Hz Output Type Open collector Output Current 500 mA maximum Output Modes Remote On Off High Alarm Low Alarm Switched Power Ports Ports 2 switched battery Output Current 500 mA maximum Modes Remote On Off Scheduled On Off On During Measure Data Storage Memory Type 4 MB non volatile flash Data Record Size 1 to 64 registers 2 to 128 bytes Number of Data Records 131 008 1 register per record no encryption to 25 216 64 registers per record with encryption Recording Rate 1 record per second with no wraparound 1 record per 5 seconds after wraparound Recording Endurance 50 000 wraparound and erase cycles Data Security AES 128 Advanced Encryption Standard Data Retention 10 years 11 PWS 600 User s Manual Real Time Clock Resolution 0 01 seconds Accuracy 1 minute per month temperature compensated Backup Battery Life 10 years Temperature Sensor Resolution 0 1 C Accuracy 3 C Voltage Sensor Resolution 0 01 Vdc Accuracy 0 05 Vdc 12 PWS 600 User s Manual 5 Installation 5 1 Environmental Consider
84. put on continuously Combined with the Off mode this mode permits remote control or test of a discrete output 7 8 2 2 Data Record Offset This register specifies the offset into the last logged record where the logged value resides The offset must be aligned with a valid log value in order for the alarm value comparison to be valid 7 8 2 5 Data Record Data Type This register specifies the data type of the logged value pointed to by the data record offset The data type must match the type of the recorded value in order for the alarm value comparison to be valid The logged value will be converted to a floating point value for comparison to the alarm threshold Data Types Value Description 0 USHORT 1 register 1 SHORT 1 register 2 FLOAT 2 registers 7 8 2 4 Alarm Threshold This register specifies the alarm threshold It must be of the same units and scaling as the recorded log value 7 8 2 5 Hysteresis Hysteresis can range from 0 0 to 10 0 of the alarm threshold and is specified in 0 196 increments For example 2 596 is written as 25 Adding hysteresis prevents chatter of the discrete output if the logged value is moving slowly about the alarm threshold 56 PWS 600 User s Manual 7 9 Data Log Recording Registers These registers configure data log security and allow the MODBUS master device to record additional information in the data log such as user notes Data Log Recording Registe
85. r Size Data Default Offset Registers Type Access Name Value 0 1 USHORT R W Sensor Network 1 4 1 7 7 R W sensor network protocol dependent All 8 registers in a group must be read and written within a single command The first register in each command group specifies the sensor network on which the sensor is located The RS485 smart sensor network is sensor network 1 the SDI 12 smart sensor network is sensor network 2 the analog sensor network is network 3 and the discrete network is network 4 The function of the remaining registers in each command group varies depending on the configuration of the selected network Note changing the sensor network selection may cause other settings in the command group to become invalid due to a change in the network protocol Configure sensor networks before selecting a sensor network 7 6 8 MODBUS Command Group Format The following table defines the sensor command group for a smart sensor network configured to use a MODBUS protocol RTU or ASCII Each register in the table is an offset from the first register of the sensor command group as specified in the Data Log Configuration Registers Table Sensor Command Group Register Size Data Default Offset Registers Type Access Name Value 0 1 USHORT R W Sensor Network network 1 only 1 1 1 USHORT R W Sensor Address 1 to 247 1 2 1 USHORT R W Data Typ
86. r device 485B is the positive transceiver signal 485A is the negative transceiver signal and GND is the ground reference No termination resistor is provided internally In most applications no termination resistor is necessary If required a resistor may be added externally The maximum offset of the transceiver signals from GND 7 volts Both signals are transient protected 5 8 2 RS232 Signals RS232 communication is done using the 9 pin D sub connector labeled MODEM PLC Connection to a PC or equivalent device requires the use of a null modem cable Connection to a modem requires a regular straight through cable 18 PWS 600 User s Manual 6 Getting Started The PWS 600 communicates as a slave device using the industry standard MODBUS protocol for serial devices This section provides guidelines to getting the device up and running If the device is not already wired follow the installation instructions provided in the previous section Section 7 describes the device register map The PWS 600 uses the MODBUS Holding Registers data model exclusively All of the device functionality is accessed using the MODBUS read and write holding register commands Section 8 provides the details of the MODBUS protocol for users that are not familiar with MODBUS Also refer to Section 8 for device specific implementation information such as the organization of registers into data types 6 1 Device Configuration Configuring the device
87. record is non volatile The content of this register has no effect when reading data records via the Data Log Retrieval registers 7 10 5 Record Number Write this register to specify the data record number to read If the write is successful the remaining registers are filled in with the record data and are ready to be read The average response time is 500 milliseconds seconds The maximum response time is 1000 milliseconds Attempting to write a record number less than the lowest record number or greater than the highest record number will result in an exception response with the ILLEGAL WRITE VALUE exception code If a data record is found to be corrupt the device will return an exception response with the CORRUPT DATA RECORD exception code As much of the data record will be retrieved as possible however the register count and or contents of the record are suspect If the register count returns zero the record could not be retrieved A corrupt record can occur if power fails during the time the data record is being written 7 10 6 Record Size After writing the record number this register provides the size of the record in registers The size includes all registers from the first register of the time stamp to the last data register 7 10 7 Record Data After writing the record number the record data registers can be read All data registers may be read including those beyond the record size This permits the master device to read all of
88. red timeout Zero specifies no retries only one break and one command attempt will be made If the sensor fails to respond to a command after the allowed number of retries the sensor will be considered unresponsive and the SDI 12 sentinel value will be substituted for all values that were expected by the command Each break attempt is followed by the specified number of command attempts For example if break retries is set to 1 and command retries is set to 2 1 The device will first send a break followed by the command If no response is received the command will be retried two more times If still no response is received the break will be retried followed by three more attempts to send the command 4 If still no response is received all values that we expected to be received will be logged with the SDI 12 sentinel value 7 5 2 3 Sentinel Value The sentinel value is written in place of the measurement value for all sensor measurements that cannot be read by a command This will occur if an SDI 12 sensor fails to respond to a command or if a command is improperly structured to log more measurements than the sensor will return 7 5 2 4 Message Counters The message counter registers provide diagnostic information for troubleshooting communication problems Each counter is reset by writing it to zero The counters roll back to zero after the maximum count value of 65535 is reached The registers are volatile and will reset to zero if power
89. resets back to zero after record is logged 4 DIO2 Positive edge debounced switch counter counts up to 65535 switch closures between log records resets back to zero after record is logged 5 DIO1 Negative edge debounced switch counter counts up to 65535 switch closures between log records resets back to zero after record is logged 6 DIO2 Negative edge debounced switch counter counts up to 65535 switch closures between log records resets back to zero after record is logged 7 DIO1 Pulse counter counts up to 65535 pulses between log records resets back to zero after record is logged 8 DIO2 Pulse counter counts up to 65535 pulses between log records resets back to zero after record is logged 9 DIO1 Frequency counter 1 second gate measures from 1 to 65535 Hz 10 DIO2 Frequency counter 1 second gate measures from 1 to 65535 Hz 49 PWS 600 User s Manual 7 6 11 2 Output Format The output format specifies how the sensor measurement is formatted and added to the current data record Output Format Value Description 0 USHORT 1 register 1 SHORT 1 register 2 FLOAT 2 registers The internal measurement result is a floating point value specifying a FLOAT output places the measurement result directly into the current data record as a FLOAT If an USHORT value is specified the floating point value is rounded to an unsigned integer value in the range O to 65535 If the rounded value is
90. rial locations CE e EN55011 2009 Class A Group 1 for emissions CE e CISPR 11 Ed 5 0 2009 05 Class A Group 1 for emissions e CFR Title 47 FCC Part 15 Class A for emissions Any changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment 1 1 FCC Statement This device has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This device generates uses and can radiate radio frequency energy and if not installed and used in accordance with this manual may cause harmful interference to radio communications Operation of this device in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense 1 2 Battery Statement This device contains a poly carbonmonoflouride lithium coin cell battery to preserve the real time clock when power is not applied The Department of Transportation requires that the outside of each package that contains primary lithium batteries regardless of the size or number of batteries be labeled with the following statement PRIMARY LITHIUM BATTERIES FORBIDDEN FOR TRANSPORT ABOARD PASSENGER AIRCRAFT The labeling requirement covers
91. rs Register Size Data Default Number Registers Type Access Name Value 1300 8 STRING W Encryption Key 1320 1 USHORT W Register Count 1321 64 USHORT W Data Registers 7 9 1 Encryption Key Write this 8 register string to set a 128 bit encryption key Afterwards all data records written to the data log will be encrypted using this key The registers are write only so that the key is protected The registers are non volatile so the key need only be written once prior to recording data When shipped from the factory or after a factory defaults command is issued the key is erased and encryption is disabled Issuing a factory defaults command does not remove encryption from data already stored in the data log It is recommended that the user not mix data recorded with different encryption keys or mix encrypted and unencrypted data in the same log as this will make decrypting the log difficult Changing the encryption key does not change the encryption of previously recorded data The data log should be erased prior to or immediately after changing the encryption key Note It is the responsibility of the user to manage encryption keys Once written the encryption key cannot be read out of the device Once data is recorded with encryption it cannot be decrypted without the original key 7 9 2 Recording Data Data is recorded in the data log using the following procedure 1 Write the number of registers to
92. rupt record and the download will continue 62 PWS 600 User s Manual 7 10 11 Last Data Log Record These registers allow a master device to read the last data record from the data log directly The format and encryption requirements are the same as those for a retrieved record Last Data Log Record Registers Register Size Data Default Number Registers Type Access Name Value 2200 2 ULONG R W Record Number 2202 1 USHORT R Record Size in Registers 2203 4 TIME R Date and Time 2207 1 USHORT R Site Id 2208 1 USHORT R Device Id 2209 2 ULONG R Device Serial Number 2211 1 USHORT R Device Status 2212 1 SHORT R Ambient Temperature Cx 10 2213 1 USHORT R Input Voltage mV 2214 1 USHORT R Register Count 2215 64 USHORT R Data Registers 2279 4 USHORT R Encryption Padding Registers The last data log record is only valid while data logging is enabled If the data log is disabled or if no data record has been recorded since the data log was enabled the record number will return zero to indicate that the remaining record data is not valid 63 PWS 600 User s Manual 7 11 Sensor Network Pass Through Registers The PWS 600 supports pass through from its communication port network to a sensor network to assist in the configuration and maintenance of connected sensors Sensor Network Pass Through Registers Register Size Data Defa
93. s register records information about the last reset event that caused the power outage bit to be set in the device status register Reset Types Type Description 0 None recorded 1 Power outage detected by the CPU power lost and restored 2 Brownout detected by CPU marginal power source e g very low battery 3 Brownout detected by the timekeeping circuit marginal power source 67 PWS 600 User s Manual 7 13 3 Fault Information These registers record information about the last fault event that caused the device fault bit to be set in the device status register The fault count records the number of fault events An occasional fault may indicate a normal recovery from an unusual power loss sequence or transient event Frequent faults may indicate hardware damage or a firmware defect Fault Types Type Description None recorded Invalid interrupt last fault information register updated with interrupt number Memory access violation Oil A O Watchdog timeout 7 13 4 High and Low Temperatures These registers record the ambient temperature extremes in degrees Celsius multiplied by 10 experienced by the device 7 13 5 Data Log Chip Id This register reports the identification of the internal data log chip The value may be any one of the values listed in the table 7 13 6 Data Log Erasure Count This non volatile register records the number of times the dat
94. ster specifies the measurement command to be sent to the sensor The device supports all of the standard SDI 12 measurement commands as outlined in the following table SDI 12 Measurement Command Table Register Value SDI 12 Command Description 0 M Start measurement 1to9 M1 to M9 Start additional measurement 10 MC Start measurement with CRC 11 to 19 MC1 to MC9 Start additional measurement with CRC 20 SE Start concurrent measurement 21 to 29 C1 to C9 Start concurrent additional measurement 30 CC Start concurrent measurement with CRC 31 to 39 CC1 to CC9 Start concurrent additional measurement with CRC 40 to 49 RO to R9 Read continuous measurement 50 to 59 RCO to RC9 Read continuous measurement with CRC Attempting to write any other value will result in an exception response with the ILLEGAL WRITE VALUE exception code 7 6 9 3 SDI 12 Measurement Selection Bit Mask This 32 bit register specifies which measurements returned by the sensor are to be logged Bit O corresponds to the first measurement returned Bit 31 corresponds to the 32 measurement returned Any bit set to a one selects the corresponding measurement to be logged Any bit set to a zero will cause the corresponding measurement to be discarded Note Version 1 3 of the SDI 12 specification limits the number of measurements returned by a sensor in response to a given measurement command
95. t 2 Bit 3 Bit 4 Bit 5 Bit 6 Stop Stop 70 PWS 600 User s Manual Although not specified by the MODBUS standard the PWS 600 will also support the ASCII mode using 8 bit characters with or without parity as described for the RTU mode 8 2 2 ASCII Message Format An ASCII message is comprised of a sequence of 9 to 513 characters The format of a message is as follows Start Slave Address Function Code Data LRC End 1 char 2 chars 2 chars O to 504 chars 2chars 2 chars CR LF 1 byte 1 byte 0 to 254 bytes The ASCII colon character begins a message The message ends with the ASCII control characters carriage return CR and line feed LF The byte information of an ASCII message from the slave address to the end of the data is identical to that of an RTU message Each byte of the message is transmitted as two ASCII hexadecimal characters 0 9 A F By default intervals up to one second may elapse between characters within the message The device supports a programmable timeout interval up to 60 seconds Intervals exceeding the timeout value will cause the device to assume an error has occurred and discard the message Each reception of a colon character signals the beginning of a new message If a message was in the process of being received when a colon is received the previous message will be discarded The ASCII mode uses a Longitudinal Redunda
96. ted as read only R versus R W in the register map Attempting to write data to a read only register will result in an exception response with the READ ONLY REGISTER exception code e Ifan attempt is made to write an out of range value to a register an exception response with the ILLEGAL WRITE VALUE exception code will be returned 78 PWS 600 User s Manual The response to a write single register command is typically returned in less than 100 milliseconds 8 6 5 Exception Response When the device encounters an error condition in a command from the Master it will reply to the command with the standard MODBUS exception response Exception Response Byte Offset Field Description Type Value 0 Device Address BYTE 1 247 1 Function Code 128 0x80 BYTE 128 255 0x80 OxFF 2 Exception Code BYTE 0 255 OxFF 8 6 5 1 Standard Exception Codes The following exception codes are defined by the MODBUS protocol Exception Code Name Description 1 0x01 ILLEGAL FUNCTION The function code received in the command is not valid for the device 2 0X02 ILLEGAL DATA ADDRESS The register address or the register range received in the command is not valid 3 0x03 ILLEGAL DATA VALUE A value contained in the command is not valid such as a mismatch between the number of registers and the byte count This exception indicates an error in the structure of a command 4 0x04 DEVICE FAILURE An err
97. ts the communication parameters of the RS485 and RS232 ports The default value is 276 0x114 for RTU mode at 19200 baud 8 bits even parity and 1 stop bit The register is non volatile Register Bits Reserved Protocol Stop Parity Data Baud Rate 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 default RTU protocol O 0 1 ASCII protocol 0 1 0 IP protocol 1 0 0 default 1 stop bit 2 stop bits 1 default Even parity 0 Odd parity 0 1 No parity 1 7 data bits 0 default 8 data bits 1 1200 baud 0 0 0 0 2400 baud 0 0 0 1 4800 baud 0 0 1 0 9600 baud 0 0 1 1 default 19200 baud 0 1 0 0 38400 baud 0 1 0 1 57600 baud 0 1 1 0 When this register is written the response will be returned at the previous communication settings All subsequent commands must be sent at the new settings Attempting to write any combination of bits not listed in the above table will result in an exception response with the ILLEGAL WRITE VALUE exception code Note that 7 data bits in the RTU transmission mode is an invalid combination the device will respond with an exception and the ILLEGAL WRITE VALUE exception code 27 PWS 600 User s Manual 7 4 2 Message Timeout If RTU or IP is selected this register specifies the amount of idle time that must elapse before the device recognizes the end of a message A value of zero specifies a timeout that is sel
98. ult Number Registers Type Access Name Value 2000 1 USHORT R W Sensor Network 0 2001 64 USHORT R W Command Response string 0 7 11 1 Sensor Network This non volatile register selects the sensor network for pass through Setting this register to zero disables pass through communication The data log must be disabled or paused in order to use pass through commands 7 11 2 MODBUS Protocol Pass Through If the selected sensor network is configured for a MODBUS protocol the PWS 600 passes any MODBUS command on its communication port that is not addressed to the PWS 600 itself to the sensor network and will pass back the sensor response The sensor will appear as if it resides on the master network If the MODBUS protocol or communication setting of the sensor network differs from that of the communication port the device will translate messages accordingly 7 11 3 SDI 12 Protocol Pass Through If the selected sensor network is configured for the SDI 12 protocol the master device must utilize the SDI 12 Command Response registers and device command to generate a pass through message and receive the response The command and response string is treated as a packed ASCII STRING data type as described in the Data Types section of the manual however individual registers are read write accessible so that only the required registers need to be written or read instead of the entire contents of the string Use the following procedure to pass a

PWS-600 User Manual - Prairie Wind Systems

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