Digital SERIES
Contents
1. 0403000005 Cr Write Setpoint Command where xxxx is a hexadecimal number in the range of 0000 7D00 hex 0000 0 7D00 100 The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table Read Setpoint Command 06030401210121 lt CR gt lt LF gt gt 0603020121xxxx lt Cr gt Read Setpoint Command where xxxx is a hexadecimal number in the range of 0000 7D00 hex 0000 0 7D00 100 21 SECTION 7 Read Flow Signal Command 06030401200120 lt CR gt lt LF gt gt 0603020120xxxx lt Cr gt Read Flow Signal Command where xxxx is a hexadecimal number in the range of 0000 7D00 hex 0000 0 7D00 100 Analog Input Mode Command 050301010401 lt CR gt lt LF gt gt 0403000004 Cr Puts the Digital Mass Flow Controller in Analog Input Mode In this mode the Digital Mass Flow Controller responds to an analog setpoint voltage The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table Close Valve Command 050301010403 lt CR gt lt LF gt gt M HM 0403000004 lt Cr gt Closes the valve of the Digital Mass Flow Controller regardless2. 8 7 Alarm setpoint mode Available alarm setpoint modes for device Value Description 0 no setpoint change at alarm 1 new safe setpoint at alarm enabled set at alarm new setpoint 8 8 Alarm new setpoint New safe setpoint during alarm situation until reset 8 9 Alarm delay time Time in seconds alarm action will be delayed when alarm limit has been exceeded Also time in seconds automatic reset will be delayed when sensor signal reaches safe level again 26 SECTION 8 8 10 Reset alarm enable Available alarm reset options 8 11 Using an alarm examples Using the alarms will take three steps 1 Preparing the instrument setting correct values for mode limits etc 2 Monitoring the alarm info byte gives info which alarm has occurred 3 Resetting the alarm will re initialize the alarm and set output to normal values again All settings needed are secured parameters These parameters can only be changed if a key parameter init reset value has been sent first to get the instrument in a soft init mode It will stay in this mode until a new power up situation Using maximum and minimum alarm This alarm will check if the measured signal crosses the maximum or minimum limit set by the user Example Setting maximum alarm on 90 Setting minimum alarm on 10 Relay TTL output should be on off No new setpoint wanted at crossing alarm limit Delay on action at output should be 10 seconds Reset shou
3. 9 9 Using a counter example J arrian 30 Section 10 POLICIES AND CERTIFICATE OF WARRANTY 31 PriG S EE 31 Payment Terms zune kundane eksen ek te 31 ohiprnents ave tente ee et 31 ete 31 Changes of Order ieee tended ei edid nh at 31 i ES 31 Certificate of Warranty aeiia 31 SECTION 1 INTRODUCTION The Modbus interface offers a direct connection to Modbus for Porter digital massflow meters controllers This manual is limited to the description of the interface between the Modbus Mass Flow Controller with a master device This manual will explain how to install a Porter instrument to your Modbus system It only contains the information that is needed most More detailed information about Modbus can be found at Website of the Modbus organization www modbus org or any website of the local Modbus organization of your country when available The implementation of the Modbus interface is based on the following standards 1 MODBUS Application Protocol Specification V1 1 December 6 2002 www modbus org 2 MODBUS over Serial Line specification and implementation guide V1 0 December 2 2002 www modbus org There is no mutual communication between Modbus slaves only between master and slave Each slave shoul
4. counter mode 12 Default all reset inputs are enabled so this command isn t really necessary Now the counter will be active Alarm counter status can be monitored by means of parameter alarminfo Resetting the counter will need following command reset 1 To inactivate the counter put it in counter mode This will also reset your outputs This can be done sending command counter mode 0 30 SECTION 10 POLICIES AND CERTIFICATE OF WARRANTY Policies Prices All prices are F O B Hatfield PA and subject to change without notice All merchandise will be invoiced at prices in effect at time of shipment Prices do not include insurance freight taxes or special handling These charges if applicable will be shown separately on invoice Minimum order 30 00 Payment Terms Net 30 days after invoice date All invoices past due are subject to a finance charge of 172 per month 18 annual rate Shipments Shipment of merchandise shall at times be subject to credit approval and will be contingent upon fires accidents emergencies acts of God or any other causes which are beyond Porter Instrument Parker Hannifin s control Specifications and dimensions subject to change Certificate of Warranty Cancellations No cancellations will be accepted on non standard or special merchandise except by payment of full purchase price If buyer requests cancellation of any order or part thereof and is
5. 6 PARAMETER NAME Sensor type Capunit Identnumber ContrResp RespStable RespOpenO Calibration mode Monitor mode Reset Sensor zero potmeter Modbus slave address Polycnst A Polycnst B Polycnst C Polycnst D TdsDn TdsUp Capicity Fluid name Capacity unit string Fmeasure Fsetpoint Temperature Capacity 096 SECTION 3 PARAMETER TYPE ACCESS PDU ADDRESS Unsigned char 0x002bE secured Unsigned char 0x002F secured Unsigned char OxOE2C secured Unsigned char OxOE45 secured Unsigned char secured Unsigned char Ox0E52 secured Unsigned char secured Unsigned char 2 Unsigned char Ox0E68 Unsigned char Ox0E85 secured Unsigned char OxOFAA secured secured secured secured secured secured secured secured RW 0x8188 0x818C bytes secured String 7 bytes 0x81F8 0x81FB secured Foer REGISTER NUMBER Hex 0x002F 0x0030 OxOE2D Ox0E46 Ox0E52 OxOE53 0x0E62 OxOE63 Ox0E86 0x8129 0x812A 0x8131 0x8132 0x8139 0x81A 0x8141 0x8142 0x8159 0x815A 0x8161 0x8162 0x8169 0x816A 0x8189 0x818D 0x81F9 0x81FC OxA101 0xA102 0xA119 0xA11A 0xA139 0xA13A OxA1B1 0xA1B2 m ee frac ee Er Ered same same see 33273 33276 E 41217 41218 iss 41241 41242 See addr 41273 41274 0x0427 41393 41394 fr Not
6. 6 2 CRC Checking The RTU mode includes an error checking field that is based on a Cyclical Redundancy Checking CRC method performed on the message contents The CRC field checks the contents of the entire message It is applied regardless of any parity checking method used for the individual characters of the message The CRC field contains a 16 bit value implemented as two 8 bit bytes The CRC field is appended to the message as the last field in the message When this is done the low order byte of the field is appended first followed by the high order byte The CRC high order byte is the last byte to be sent in the message The CRC value is calculated by the sending device which appends the CRC to the message The receiving device recalculates a CRC during receipt of the message and compares the calculated value to the actual value it received in the CRC field If the two values are not equal an error results The CRC calculation is started by first pre loading a 16 bit register to all 1 s Then a process begins of applying successive 8 bit bytes of the message to the current contents of the register Only the eight bits of data in each character are used for generating the CRC Start and stop bits and the parity bit do not apply to the CRC During generation of the CRC each 8 bit character is exclusive ORed with the register contents Then the result is shifted in the direction of the least significant bit LSB with a zero filled i
7. Chr AddrLo Chr NumBytesHi Chr NumBytesLo intCRC16 CRC SourceString End Function Function CRC Message As Long Picked up off the web tidied up slightly CRC runs cyclic Redundancy Check Algorithm on input message Returns value of 16 bit CRC after completion and VW kkkkkkkkkkkk always adds 2 crc bytes to message kkkkkkkkkkkkkkkkkkkkkk returns 0 if incoming message has correct CRC Must use double word for CRC and decimal constants Dim CRC16 As Long c bit crch crcl CRC16 amp 65535 For c 1 To Len Message CRC16 amp CRC16 amp Xor Asc Mid Message c 1 For bit 1 To 8 If CRC16 amp Mod 2 Then CRC16 amp CRC16 amp 2 Xor 40961 Else CRC16 amp CRC16 amp 2 End If Next bit Next c crch CRC16 amp 256 crcl CRC16 amp Mod 256 Message Message Chr crcl Chr crch CRC amp CRC16 amp End Function 19 SECTION 6 6 5 Example Read Flow Signal Commandi is in this format DeviceAddr 8 bits Command 8 bits AddrHi 8 bits AddrLo 8bits NumBytesHi 8 bits NumBytesLo 8 bits ChecksumHi 8 bits Checksum Lo 8 bits So for DeviceAddr 3 Command 3 AddrHi 0 AddrLo 32 NumBytesHi 0 NumBytesLo 2 The following string would be sent using Visual Basic Chr 03 Chr 03 Chr 0 Chr 32 Chr 0 Chr 2 Chr Hi Byte checksum Chr Lo Byte checksum 6 6 Example Read SetPoint Command is in this format DeviceAddr 8 bits Com
8. Via RS232 VB Communication Program seen 9 4 2 Via micro switch and LED s on top of the instrument sssssssssss 10 4 2 1 Readout bus address MAC ID and baud rate sssssssssssssss 10 4 2 2 Change bus address and baud rate sss 11 4 3 Via rotary switches on the side of the instrument if present 12 TROUBLESHOOTING une n paccm emis 13 5 1 Visual diagnostics t asin tind 13 5 2 otep by steD irn dn ren o tlt 13 5 3 BUs diagnostics sting b ee 13 MODBUS DETAILS 15 6 1 Modbus Message RTU Framing seem emm em 15 6 2 CRG Checking eee ea o Ie 16 0 3 CRG Generation fois acer prr netter tta te iue Fe cheer dd 16 6 4 Example Visual Basic 19 6 5 Example Read Flow Signal seseeee emm eene 20 6 6 Example Read SetPoint esses 20 6 7 Example Read Flow Signal and SetPoint sssssseee 20 6 8 Example Write SetPoint ssssssssssssseseeeeee eene 20 RS232 COMMUNICATION COMMANDS seem eem ennemis 21 RS232 Command Table 2 E e as 21 Error Godes Table iiec et cti fekk ene e
9. When the program is started it will automatically read values and allow you to perform the commands via button selections on the screen Setpoint values are 0 32000 0 to 100 flow Type in a setpoint value select write values applies the setpoint button lights for write and then read Flow signal values are displayed ml 4 Porte Valid values for the slave address are between 1 and 247 valid values for the baud rate are 9600 19200 and 38400 The changed values will be effective immediately after changing SECTION 4 4 2 Via micro switch and LEDs on top of the instrument Note For all model 3600 Mass Flow Meters and Controllers access to the microswitch and LED s is attained by removing the top cover of the device This note applies to all push button and LED references throughout this manual WARNING DO NOT REMOVE TOP COVER WHEN AN EXPLOSIVE ATMOSPHERE MAY BE PRESENT AVERTISSEMENT NE PAS ENLEVER LE COUVERCLE SUP RIEUR SI L ATMOSPH RE PEUT TRE EXPLOSIVE A WARNING DO NOT SEPARATE EXTERNAL CONNECTORS WHEN ENERGIZED AVERTISSEMENT NE PAS SEPARER LES CONNECTEURS EXTERNES S ILS SONT SOUS TENSION With the micro switch on the instrument it is possible to change and readout the settings for slave address and baud rate The LED s will indicate the tens of the address with green flashes and the units with red flashes For baud rate indication both LED s will flash 4 2 1 Readout bus address MAC
10. agreed to by Porter Instrument Parker Hannifin in writing buyer will be subject to cancellation charges to cover the cost of material and or fabrication incurred by Porter Instrument Parker Hannifin to date of cancellation Changes of Order A minimum of 90 days notice is required on all changes to orders and will be subject to rescheduling as a new order at Porter Instrument Parker Hannifin s discretion Returns No returns will be accepted unless authorized in writing by Porter Instrument Parker Hannifin and accompanied by a properly completed Returned Goods Authorization All returns are subject to restocking and possible rework charges to be determined by Porter Instrument Parker Hannifin THIS WARRANTY IS GIVEN IN PLACE OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE NO PROMISE OR STATEMENT MADE BY ANY REPRESENTATIVE OR AUTHORIZED DEALER OF PORTER INSTRUMENT PARKER HANNIFIN SHALL CONSTITUTE A WARRANTY BY PORTER INSTRUMENT PARKER HANNIFIN PORTER INSTRUMENT PARKER HANNIFIN ASSUMES NO LIABILITY FOR USE OF THIS EQUIPMENT Porter Instrument Parker Hannifin warrants this equipment to be free from defects in workmanship and materials when used in accordance with applicable specifications and with appropriate maintenance for one 1 year from date of delivery to the customer unless otherwise specified in writing Equipment which malfunctions may be returned shipment pr
11. bits fraction The first register contains bit 32 16 the second register contains bit 15 0 String parameters can have a length of maximal 16 bytes and can take up to 8 Modbus registers where each register contains two characters bytes The upper byte of the first register contains the first character of the string When writing strings the write action should always start from the first register as a complete block it is not possible to write a part of a string If the string is shorter than the specified maximum length the string should be terminated with an 0 Parameters Temperature Counter value and Counter limit can be found in the parameter table as an unsigned integer variant and as a floating point variant Only the floating point variant supports the full parameter range and resolution OxE838 0xE839 OxF108 0xF10A OxF110 0xF116 OxF118 0xF11F OxF120 0xF127 OxF121 0xF128 61729 61736 OxF129 0xF12B 61737 61739 OxF131 0xF437 OxF2A9 0xF2AA OxF2B1 0xF2B2 OxF2B9 0xF2BA OxF509 0xF50A 62729 62730 OxF511 0xF512 62737 62738 OxF128 0xF12A OxF130 0xF136 OxF2A8 0xF2A9 OxF2B8 0xF2B9 OxF508 0xF509 OxF510 0xF511 OxF520 0xF521 OxFD48 0xFD49 SECTION 4 CHANGING SLAVE ADDRESS AND BAUD The slave address and baud rate of the Porter meter controller Modbus slave can be changed to fit the instrument in your existing Modbus network Changing the slave
12. by slave check RS485 network especially DO and D1 signals gt 0000 0000 0000 0000 Slave detected valid Modbus messages for other addresses make sure master uses correct slave address re Wi nil 720000 Slave detected invalid messages on the bus make sure master uses correct baud rate and parity settings Mi Led 0000 Slave detected both valid and invalid messages make sure RS485 bus termination and polarization are used correctly and the maximum number of devices is not exceeded See Section 2 for details 0000 gt 0000 0000 gt 0000 Slave has received bytes faster than it could process make sure master uses correct baud rate You may want to try a lower baud rate gt 0000 0000 gt 0000 0000 No problem detected by slave make sure application timeout of master is set to a value larger than 100 ms 14 SECTION 6 MODBUS DETAILS You can use the Porter Modbus VB Communication program to change slave address and baud rate and perform simple commands via the Modbus RJ45 connection at the top of the instrument Commands such as setpoint 0 100 or specific reading flow signal opening or closing the control valve and putting the controller into Bus RS232 or Analog mode are easily accomplished by a screen button click selection Run the Visual basic program Modbus VB Communication program installed on the host computer select from Start Menu or run the exe file When the program is started it will a
13. for the next 8 bit byte of the message Continue doing this until all bytes have been processed 7 The final content of the CRC register is the CRC value 8 When the CRC is placed into the message its upper and lower bytes must be swapped as described below Placing the CRC into the Message When the 16 bit CRC two 8 bit bytes is transmitted in the message the low order byte will be transmitted first followed by the high order byte For example if the CRC value is 1241 hex 0001 0010 0100 0001 Addr Func Data Data Data Data CRC CRC Count Lo Hi 0x41 0x12 Figure 30 CRC Byte Sequence 17 SECTION 6 Calculation algorithm of the CRC 16 CRC16 CRC16 XOR BYTE CRC16 Move to the right CRC16 Following BYTE XOR exclusive or N number of information bits POLY calculation polynomial of the CRC 16 1010 0000 0000 0001 Generating polynomial 1 x X 15 X 15 In the CRC 16 the 1st byte transmitted is the least significant one 18 SECTION 6 6 4 Example Visual Basic code Function Get Checksum DeviceAddr Command AddrHi AddrLo NumBytesHi NumBytesLo As Long Assemble SourceString It consists of the Device Address the command the address of the command the number of bytes The function CRC is used to generate a CRC16 Modbus checksum which is appended to SourceString SourceString Chr DeviceAddr Chr Command Chr AddrHi
14. will burn continuously in case of a hardware failure During normal operation the red LED is switched on during frame reception or sending on the Modbus interface 5 2 Step by step 3 Check all Modbus settings at your master Master and device settings must be the same check baud rate and parity setting See Section 3 1 for details 3 Check slave address and baud rate of device slave See Section 4 for details a Check cabling and bus termination of your Modbus system See Section 2 for details a Check power supply Instruments need 15Vdc or 24Vdc Try to reset the instrument and or restart your master a Check the bus diagnostics string See below Contact Modbus sales representative or service department 5 3 Bus diagnostics string The bus diagnostics string can be found in the RS232 VB Communication Program see section 4 1 The format of the string is mAAAA eBBBB sCCCC cDDDD where AAAA BBBB CCCC and DDDD are hexadecimal representations of 16 bit counters bus messages count CPT1 3 BBBB bus communication error count CPT2 a CCCC slave message count CPT4 3 DDDD bus character overrun count CPT8 13 SECTION 5 The following table may be helpful to find the source of communication problems on Modbus In general read out this string after trying to communicate between master and slave without switching off the power in the meantime 0000 0000 0000 0000 No communication detected
15. 3 Section 4 Section 5 Section 6 Section 7 TABLE OF CONTENTS INTRODUCTION Elde 1 1 1 Removal of Device 1 INSTALLATION s iei etui a exe 2 2 1 Connectors EC 2 2 2 Termination le 3 2 2 1 Termination resistors iisisti ieai aia ie aeee a 3 2 2 2 BIASING 5 de Mie de idee dances nude de bed dei 3 FUNCTIONAL DESCRIPTION ssssseese eene nennen ieee nnne nennen enne en nnns 4 3 1 Implementation Class ccc cece eee eee ence eee ee ee ee nemen 4 3 2 Response Time ed Aion dete tol Side eek dee ai 4 3 3 Supported Modbus Functions ccccceeecceceeeeeeeceecaeceeeeeeeeeecenaeceeeeeeeseesecieeeees 4 3 3 1 Read Holding Registers 03 urrnnrrnnnnnnnrrnnnennrrrnnrnnrrennrnnrrenrrnnrreneennrrressennnne 4 3 3 2 Write Single Register 06 rrrnrrnnrrnnnonnrrrnnnennrrnnrrnnrrenrrnnrrenrrnnrrennrrnnrrensennnne 4 3 3 3 Write Multiple Registers 16 sss 5 3 3 4 Diagnostics 08 eire eeepc e e teer e eret bid ce 5 3 35 Report Slave ID 1 2 annie pb MER a t eee e e Ed sine REUS 5 3 4 Available Parame ES a a a aa e eterne nennen 6 CHANGING SLAVE ADDRESS AND BAUD RATE eee emen 9 4 1
16. Controllers access to the RS232 connector is attained by removing the top cover of the device This note applies to all RS232 references throughout this manual WARNING DO NOT REMOVE TOP COVER WHEN AN EXPLOSIVE ATMOSPHERE MAY BE PRESENT AVERTISSEMENT NE PAS ENLEVER LE COUVERCLE SUPERIEUR SI L ATMOSPHERE PEUT ETRE EXPLOSIVE AN WARNING DO NOT SEPARATE EXTERNAL CONNECTORS WHEN ENERGIZED AVERTISSEMENT NE PAS S PARER LES CONNECTEURS EXTERNES S ILS SONT SOUS TENSION Slave address and baud rate can also be changed using the button on top of the instrument See Section 4 for more details Physically connect the instrument to the Modbus network Warning this device uses a vendor specific pin layout on the RJ45 connector A that differs from the Modbus recommended pin layout See Section 2 for more details Warning For all model 3600 series MFM MFC s all external electrical A receptacles on this device must have either a cordset or sealing cap supplied with device connected installed when the device is in use Lack of compliance could result in damage to the equipment Test communication between your master host computer and the instrument s using the Porter Modbus VB Communication program or the Porter Modbus VB Flow Graph program Reference Manuals FM 1155 and FM 1153 Ingress Protection and Ingress Protection Hazardous Environment Digital Series Technical and Users Manual Section 1 Section 2 Section
17. ID and baud rate Pressing the switch 3x briefly with intervals of max 1 second in normal running operation mode will trigger the instrument to show its bus address MAC ID and baud rate For indication the bus address MAC ID the green LED will flash the amount of tens and the red LED the amount of units in the number For indication of baud rate setting both LED s will flash The flashes are called count flashes and have a pattern of 0 5 sec on 0 5 sec off LED indications for bus address and baud rate Green LED Red LED Time Indication Z Green Z Red amount of count flashes 0 12 sec tens in bus address for instrument Off 0 12 Maximum Amount of count flashes 0 9 sec units in bus address for instrument Off 0 9 Maximum baudrate setting for instrument 1 9600 Baud amount of count flashes amount of count flashes 1 5 sec 2 19200 Baud 1 5 1 5 Maximum 3 38400 Baud 4 57600 Baud MBC3 type only 5 115200 Baud MBC3 type only Note Value zero will be indicated by a period of 1 sec off 0 5 sec off 0 5 sec off 10 SECTION 4 Examples For bus address 35 and 9600 baud the green LED will flash 3 times the red LED will flash 5 times and both LED s will flash 1 time For bus address 20 and 19200 baud the green LED will flash 2 times the red LED will flash 0 times and both LED s will flash 2 times For bus address 3 and 38400 baud the green LED will flash 0 times the red LED w
18. Parker Digital SERIES GAS MASS FLOWMETER AND GAS MASS FLOW CONTROLLER TECHNICAL AND USER S MANUAL MODBUS amp RS232 DIGITAL ALARMS amp COUNTERS FM 1117 Rev A 1 12 Disclaimer Even though care has been taken in the preparation and publication of the contents of this manual we do not assume legal or other liability for any inaccuracy mistake mis statement or any other error of whatsoever nature contained herein The material in this manual is for information purposes only and is subject to change without notice Parker Hannifin Corporation January 2012 Symbols A Important information Discarding this information could cause injuries to people or damage to the Instrument or installation Helpful information This information will facilitate the use of this Sp instrument Short form start up All necessary settings for this module are already performed at Porter To follow the next steps carefully is the quickest way to get this module operational in your own Modbus environment Procedure Make sure your Modbus RTU master has been installed into the system Set Slave address and baud rate of instrument Default instruments will be delivered to customers on address 1 and with a baud rate of 19200 baud You can use the Porter RS232 VB Communication program to change Slave address and baud rate via the RS232 connection Note For model 3600 Ingress Protection Hazardous Environment Mass Flow Meters and
19. Porter Instrument Parker Hannifin 31 or Parker Hannifin Corporation Porter Instrument Division 245 Township Line Rd Hatfield PA 19440 USA 215 723 4000 fax 215 723 2199
20. UE in case of reading less than 1 or more than 125 registers 304 SLAVE DEVICE FAILURE in case of reading a write only register Warning the maximum message size for the Read Holding Registers function is 100 bytes at 9600 baud 200 bytes at 19200 baud and 400 bytes at 38400 baud When this size is exceeded corrupted responses may be received 3 3 2 Write Single Register 06 Possible exception responses 302 ILLEGAL DATA ADDRESS in case of writing to non existing address or writing to a part of a multi register parameter float long etc 304 SLAVE DEVICE FAILURE in case of writing to read only register 304 SLAVE DEVICE FAILURE in case of writing illegal value to register SECTION 3 3 3 3 Write Multiple Registers 16 Possible exception responses 302 ILLEGAL DATA ADDRESS in case of writing to non existing address or writing to a part of a multi register parameter float long etc 303 ILLEGAL DATA VALUE in case of reading less than 1 or more than 123 registers 304 SLAVE DEVICE FAILURE in case of writing to read only register 304 SLAVE DEVICE FAILURE in case of writing illegal value to register When one of the written registers raises an exception the value written to all subsequent registers are discarded ignored 3 3 4 Diagnostics 08 The following sub functions are supported Sub function code dec Name 00 Return QueryData S y O Warning the maximum message size for the Return Query Data
21. address and baud rate can be done in three different ways 4 1 Via RS232 RS232 VB Communication Program Off line via the RS232 communication port by means of a special tooling program called RS232 VB Communication Program a tool for multi bus instruments that can be used to Change slave address Read and optionally change the baud rate The following instructions apply to all models except the 3600 series MFMs MFCs For use with the 3600 series MFMs MFCs please consult factory Connect your Porter meter controller Modbus slave instrument to a free COM port using the special cable with on one side a T part with male and female sub D 9 connector and on the other side a female sub D 9 connector The single sub D 9 connector should be connected to your COM port and the female sub D 9 of the T part to the male sub D 9 of the instrument Standard cables are approx 3 meters Maximum length between PC and instrument allowed is approximately 10 meters You can use the Porter RS232 VB Communication program to perform simple commands via the RS232 connection Commands such as setpoint 0 100 or specific reading flow signal opening or closing the control valve and putting the controller into Bus RS232 or Analog mode are easily accomplished by a screen button click selection Run the Visual basic program RS232 VB Communication program installed on the host computer select from Start Menu or run the exe file
22. anything driving the network the state of the line is unknown If the voltage level at the receiver s A and B inputs is less than 200 mV the logic level at the output of the receivers will be the value of the last bit received In order to maintain the proper idle voltage state bias resistor RB1 on the data D1 Modbus B B line and a pull down to ground on the data DO Modbus A A line The Termination schematic illustrates the placement of bias resistors on the transceiver The value of the bias resistors is dependent on termination and number of nodes in the system The goal is to generate enough DC bias current in the network to maintain a minimum of 200 mV between the B and A data line Consider the following example of bias resister calculation Ideal situation Termination resistors 1200hm Receiver resistance omitted Bias supply voltage 5Vdc Wanted situation is a minimum of 200mV between A and B lines and a common mode voltage of 2 5V Minimum current therefore 200mV 60 Ohm 3 33mA Total maximum bias resister value is 5V 0 2V 3 33mA 1440 Ohm The maximum value of each biasing resistor 720 Ohm Situation with 127 nodes Termination resistors 120 Ohm Receiver resistance 12 KOhm Number of instruments 127 Bias supply voltage 5Vdc Wanted situation is a minimum of 200mV between A and B lines and a common mode voltage of 2 5V Total termination resistance 120 120 12000 127 120 120 94 5 36 7 O
23. ass Flow Meters and Controllers access to the rotary switches is attained by removing the two sealing screws on the side of the device This note applies to all rotary switch references throughout this manual WARNING DO NOT REMOVE ROTARY SWITCH SEALING SCREWS WHEN EXPLOSIVE ATMOSPHERE MAY BE PRESENT AVERTISSEMENT NE PAS ENLEVER LES VIS D TANCH IT DU COMMUTATEUR ROTATIF SI L ATMOSPHERE PEUT ETRE EXPLOSIVE The switches have the following function ADDRESS 00 99 With the ADDRESS switch the instruments address can be set The MSD is the high part of the decimal number and the LSD the low part For instance address 25 means MSD on 2 and LSD on 5 The default switch position is 00 In this position the address is software programmable The default software programmable address is 1 During instrument initialization the address switches are read If the switches specify a valid Modbus address i e a value from 1 to 99 this value is used If the specified address differs from the value stored in the instrument the new address is saved in memory m 00 SOFT ADDRESS 12 SECTION 5 TROUBLESHOOTING 5 1 Visual diagnostics LED indications can be very useful in case of problems with the instrument See Porter Technical and Users Manual for a detailed description of all LED indications The green LED is normally used for instrument status indication like normal operation or special function mode The red LED
24. ation of the CRC each 8 bit character is exclusive ORed with the register contents Then the result is shifted in the direction of the least significant bit LSB with a zero filled into the most significant bit MSB position The LSB is extracted and examined If the LSB was a 1 the register is then exclusive ORed with a preset fixed value If the LSB was a 0 no exclusive OR takes place This process is repeated until eight shifts have been performed After the last eighth shift the next 8 bit character is exclusive Ored with the register s current value and the process repeats for eight more shifts as described above The final content of the register after all the characters of the message have been applied is the CRC value 16 SECTION 6 A procedure for generating a CRC is 1 Load a 16 bit register with FFFF hex all 1 s Call this the CRC register 2 Exclusive OR the first 8 bit byte of the message with the low order byte of the 16 bit CRC register putting the result in the CRC register 3 Shift the CRC register one bit to the right toward the LSB zero filling the MSB Extract and examine the LSB 4 If the LSB was 0 Repeat Step 3 another shift If the LSB was 1 Exclusive OR the CRC register with the polynomial value 0xA001 1010 0000 0000 0001 5 Repeat Steps 3 and 4 until 8 shifts have been performed When this is done a complete 8 bit byte will have been processed 6 Repeat Steps 2 through 5
25. crews should be inspected to ensure that leak tight integrity can still be maintained If the seals appear to be damaged in any way Porter recommends replacement of these sealing screws Contact the factory to order sealing screw kit part number A 4308 000 Section 2 INSTALLATION 2 1 Connectors the Modbus recommended pin layout Warning this device may be powered through either the Modbus interface connector or the analog connector supplied on the device Power should not be supplied through both connectors simultaneously doing so may result in damage to the device or power supply Warning this device uses a vendor specific pin layout on the RJ45 connector that differs from e For all models except the 3600 Series MFMs MFCs The device has a RJ45 connector with the following pin layout 15 24V power supply Common power Common power Shield 15 24V power supply Common RS485 DO IO B D1 IO A E For model 3600 Series MFMs MFCs The device has a 5 Pin Turck Connector The 5 pin connector pinout varies with the model as follows For model 3600 Ingress Protection Hazardous Environment designated with a Y in the eighth position of the model code For Turck receptacle and mating cordset information see primary technical and user s manual for this device function 3 4 2 15 24V power supply 5 1 Shield For model 3600 Ingress Protection designated with a W in the eighth
26. d have its own unique slave address on the bus otherwise there is no communication possible Setting slave address can be performed by Modbus or RS232 command See examples in this manual Communication with the instrument via RS232 using a special cable is possible If you don t have such a cable ask your local sales representative The button LED s on top of the instrument is available for communication See Section 4 for details Note For all model 3600 Mass Flow Meters and Controllers access to the microswitch and LED s is attained by removing the top cover of the device This note applies to all push button and LED references throughout this manual WARNING DO NOT REMOVE TOP COVER WHEN AN EXPLOSIVE ATMOSPHERE MAY BE PRESENT AVERTISSEMENT NE PAS ENLEVER LE COUVERCLE SUPERIEUR SI L ATMOSPHERE PEUT ETRE EXPLOSIVE WARNING DO NOT SEPARATE EXTERNAL CONNECTORS WHEN ENERGIZED AVERTISSEMENT NE PAS SEPARER LES CONNECTEURS EXTERNES S ILS SONT SOUS TENSION 1 1 Removal of Device Cover For reasons covered in this manual access to RS232 connections microswitch and LEDs etc the user may need to remove the top cover of the device It is important to understand that the seals used to fasten the cover in place are an integral part of the sealing system that makes the device dust and liquid tight After removal of the cover the o ring seals located under the head of the socket head cap s
27. e Secured parameters may be changed using the Porter RS232 VB Secure Communication program or the Porter Modbus VB Secure Communication program SECTION 3 PARAMETER NAME PARAMETER ACCESS PDU ADDRESS REGISTER NUMBER TYPE hex 59401 59402 OxE819 0xE81A OxE839 0xE83A OxF109 0xF10B OxF111 0xF117 OxF119 0xF120 xE808 0xE809 OxE809 0xE80A Counter limit Float RW OxE818 0xE819 Counter unit String 4 string bytes 3 String 6 Modelnumber String 14 RW secured bytes Serialnumber String 16 RW secured bytes Manufacturer String 16 RW secured config bytes Firmware String 5 version bytes String 13 RW bytes Dynamic display Hoat RW secured factor Static display Float RW secured factor Exponential Float RW secured OxF521 0xF522 62753 62754 smoothing Modbus Long integer RW secured OxFD49 0xFD4A 64841 64842 baudrate Access indicates whether parameter can be Read and or Written When a byte parameter is read the upper 8 bits of the Modbus register will be 0 When a byte parameter is written the upper 8 bits must be set to 0 Long integer parameters have a length of 4 bytes and are mapped on two consecutive Modbus registers The first register contains bit 32 16 the second register contains bit 15 0 Floating point parameters have a length of 4 bytes and are mapped on two consecutive Modbus registers Floats are in single precision IEEE format 1 sign bit 8 bits exponent and 23
28. e the Digital Mass Flow Controller responds to the RS 232 setpoint The RS 232 setpoint is given by using the Write Setpoint Command The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table Bus Input Mode Command 050301010400 lt CR gt lt LF gt _ gt 0403000004 lt Cr gt Puts the Digital Mass Flow Controller in Bus Input Mode In this mode the Digital Mass Flow Controller responds to a fieldbus e g Modbus setpoint command The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table 23 SECTION 7 Enable Write Parameters Command 050301000A40 lt CR gt lt LF gt gt gt EEE 0403000004 Cr Puts the Digital Mass Flow Controller in a condition where the various parameters can be written and stored Disable Write Parameters Command 050301000A52 lt CR gt lt LF gt gt gt EEE 0403000004 lt Cr gt Puts the Digital Mass Flow Controller in a condition where the various parameters can not be written and stored Error Codes Table 00 No Error 10 PC out of memory 01 Process Claimed 11 Write only parameter 02 Command error 12 System configuration unknown 03 Process Error 13 free node address 04 Parameter Error 14 Wrong interface type 05 Parame
29. epaid to Porter Instrument Parker Hannifin for test and evaluation Equipment determined to be defective and in warranty will be repaired or replaced at no charge to the customer Equipment out of warranty will be evaluated and if the equipment does not meet original specifications and calibration the customer will be notified of the costs before proceeding with repair or replacement Repaired equipment will be warranted ninety 90 days from date of delivery to the customer or for the balance of the original warranty whichever is longer Failures due to shipping damage accident misuse improper mechanical or electrical installation or operation or internal clogging or corrosion due to use of contaminated fluids or inadequate system purging are excluded from warranty coverage Porter Instrument Parker Hannifin s obligation for breach of this warranty or for negligence or otherwise shall be strictly and exclusively limited to the repair or replacement of the equipment This warranty shall be void as to any equipment on which the serial number if applicable has been altered defaced or removed Porter Instrument Parker Hannifin shall under no circumstances be liable for incidental or consequential damages No other promise or statement about the equipment by any representative or authorized dealer of Porter Instrument Parker Hannifin shall constitute a warranty by Porter Instrument Parker Hannifin or give rise to any liability or obligation of
30. ertain alarm events This parameter is unlike the other parameters not a PROPAR parameter and can not be read via BUS but only via PROFIBUS 0 no error in communication with channel 1 error in communication 0 no PROPAR process error 1 a PROPAR process error has occurred 0 no PROPAR parameter error 1 a PROPAR parameter error has occurred 0 no PROPAR type error 1 a PROPAR type error has occurred 0 no PROPAR value error 1 a PROPAR value error has occurred 0 no error 1 a PROPAR process claim or command error has occurred Reserved Reserved Ns GJ O C MTA O 8 3 Alarm mode Available alarm modes for device Description alarm on absolute limits alarm on limits related to setpoint response alarm alarm when instrument powers up eg after power down Note Not all modes are available for all fieldbusses Eg For DeviceNet only mode 0 and 1 are available 25 SECTION 8 8 4 Alarm maximum limit Maximum limit for sensor signal to trigger alarm situation after delay time Note Minimum limit lt Maximum limit lt 100 96 8 5 Alarm minimum limit Minimum limit for sensor signal to trigger alarm situation after delay time Note 0 s Minimum limit lt Maximum limit 8 6 Alarm output mode Available alarm output modes for device Value Description 0 no relais TTL output activity at alarm 1 relais TTL output pulses until reset 2 relais TTL output activated until reset
31. essed and pressed restart counting for next attempt 0 5 sec on 0 5 sec off 4 Set baud rate of both Z red time out Press switch and count red and green flashes for field bus and Z green 60 sec baud rate setting communication LED flashes Release when wanted amount has been count 0 1 sec on 1 9600 Baud 0 1 sec off Counts up to max 5 and than starts at 0 again 2 19200 Baud 3 38400 Baud 4 57600 Baud 5 115200 Baud count flashes start when switch is pressed 0 5 sec on 0 5 sec off When counting failed keep switch pressed and restart counting for next attempt Note selection of O means No change Instrument returns to normal running operation mode Changes are valid when they are made within the time out times 11 SECTION 4 Value zero will be indicated by a period of 1 sec off 0 5 sec off 0 5 sec off When value zero is wanted press switch shortly and release it again within 1 sec Before each action of flash counting the LED s to be used for counting will flash in a high frequency Pattern 0 1 sec on 0 1 sec off As soon as the switch is pressed down this LED or both LED s will be off and the counting sequence will start 4 3 Via rotary switches on the side of the instrument if present On the side of the instrument are rotary switches placed and a label with the explanation of the switches Make sure to use a screwdriver which is suited for the switches Note For all model 3600 M
32. hm Minimum current therefore 200mV 36 7 Ohm 5 45mA Total maximum bias resistor value is 5V 0 2V 5 45mA 880 Ohm The maximum value of each biasing resistors 440 Ohm Lower values may be used Depending on maximum power consumption of the resistors Porter advices the following resistor values for the following voltages Supply voltage Termination Bias Pull up Bias Pull down termination resistors resistor resistor 121 Ohm 392 Ohm 392 Ohm 121 Ohm 1210 Ohm 392 Ohm 121 Ohm 2210 Ohm 392 Ohm 121 Ohm 3480 Ohm 392 Ohm Section 3 FUNCTIONAL DESCRIPTION 3 1 Implementation class The physical and datalink layer are implemented conforming to the basic slave implementation class as described in Modbus Over Serial Line V1 02 The following options have been implemented parameter broadcast support 9600 19200 default 38400 electrical interface 3 2 Response time This slave device will respond on each valid request from the master within 100 ms This means that the response timeout setting of the master should be set to a value larger than or equal to 100 ms 3 3 Supported Modbus functions This section describes the supported Modbus function codes Refer to Section 6 for details 3 3 1 Read Holding Registers 03 Possible exception responses 302 ILLEGAL DATA ADDRESS in case of reading of non existing address or reading a part of a multiregister parameter float long etc 303 ILLEGAL DATA VAL
33. ill flash 3 times and both LED s will flash 3 times 4 2 2 Change bus address and baud rate Pressing the switch 5x briefly with intervals of max 1 second in normal running operation mode Within the time out period of 60 seconds it is possible to start changing the bus address MAC ID of the instrument For certain field bus systems it is necessary to select the baud rate also Other field bus systems only have one baud rate or the baud rate setting will adapt to the setting of the master automatically In these cases baud rate selection is not needed and will be skipped Procedure for changing bus address and baud rate Step Action Indication time handling 1 Start Press the switch 5x briefly with intervals of max 1 second in normal running operation mode 2 Set tens of bus Z Green LED flashes time out Press switch and count green flashes for tens of address 0 1 sec on 60 sec bus address 0 1 sec off Release when wanted amount has been count count flashes start Counts up to max 12 and than starts at 0 again when switch is When counting fails keep switch pressed and pressed restart counting for next attempt 0 5 sec on 0 5 sec off 3 Set units of bus Z red LED flashes time out Press switch and count red flashes for units of bus Address 0 1 sec on 60 sec address 0 1 sec off Release when wanted amount has been count count flashes start Counts up to max 9 and than starts at 0 again when switch is When counting failed keep switch pr
34. ld be automatically when signal comes into safe area again or via FLOW BUS 27 SECTION 8 Through Modbus or RS232 links send the following parameter values initreset 164 Gems alarm setpointmode 10 alarm mode Default all reset inputs are uU So this command isn t really necessary Now the alarm will be active Alarm status can be monitored by means of parameter alarminfo Resetting the alarm will need the following command reset 0 and then reset 2 To inactivate the alarm put it in alarm mode off This will also reset your outputs This can be done sending command alarm mode 0 Using instrument with response alarm This alarm will check if the measured value will come within an area limited by maximum limit and minimum limit related to the setpoint within a certain delay time Example Setting maximum alarm limit on setpoint 3 90 Setting minimum alarm limit on setpoint 0 9 96 Relay TTL output should not be used Setpoint wanted at crossing alarm limit O 96 Delay on action at output should be 2 minutes Reset via keyboard or BUS RS232 Send following parameter values alarm maximum limit 960 alamoutputmode alarm new setpoint 10 alarm mode 2 Default all reset inputs are enabled so this command isn t really necessary Now the alarm will be active Alarm status can be monitored by means of parameter alarminfo Resetting the alarm will need foll
35. mand 8 bits AddrHi 8 bits AddrLo 8bits NumBytesHi 8 bits NumBytesLo 8 bits ChecksumHi 8 bits Checksum Lo 8 bits So for DeviceAddr 53 Command 3 AddrHi 0 AddrLo 34 NumBytesHi 0 NumBytesLo 2 The following string would be sent using Visual Basic Chr 03 Chr 03 Chr 0 Chr 34 Chr 0 Chr 2 Chr Hi Byte checksum Chr Lo Byte checksum 6 7 Example Read Flow Signal and SetPoint Command is in this format DeviceAddr 8 bits Command 8 bits AddrHi 8 bits AddrLo 8bits NumBytesHi 8 bits NumBytesLo 8 bits ChecksumHi 8 bits Checksum Lo 8 bits So for DeviceAddr 3 Command 3 AddrHi 0 AddrLo 732 NumBytesHi 0 NumBytesLo 4 The following string would be sent using Visual Basic Chr 03 Chr 03 Chr 0 Chr 32 Chr 0 Chr 4 Chr Hi Byte checksum Chr Lo Byte checksum 6 8 Example Write SetPoint Command is in this format DeviceAddr 8 bits Command 8 bits AddrHi 8 bits AddrLo 8bits NumBytesHi 8 bits NumBytesLo 8 bits ChecksumHi 8 bits Checksum Lo 8 bits So for DeviceAddr 53 Command 6 AddrHi 0 AddrLo 34 NumBytesHi 0 NumBytesLo 2 The following string would be sent using Visual Basic Chr 03 Chr 06 Chr 0 Chr 34 Chr 0 Chr 2 Chr Hi Byte checksum Chr Lo Byte checksum 20 SECTION 7 RS232 Communication Commands You can use the Porter RS232 VB Communication program to change slave addre
36. neeier 24 TABLE OF CONTENTS Section 8 ALARMS STATUS PARAMETERS n gta bett e deca abire 25 BT Alarminfo s edere ten iM DUI E indy ee abet ote a ea aaia 25 9 2 St ls a rs anne date e ER RA REED ERE TERR NQdS 25 8 3 Alarm mode tese desis ores 25 emen emeret nennen 26 8 5 Alarm minimum limitea r d seende 26 8 6 Alarm output Mode varierende t uar i ame a hero a 26 8 7 Alarm Setpoint moderna ad ette teh de orte t ee rr dea 26 8 8 Alarm New setpoints oes cocer rid ute te rae e dva teet oed a Roe ed 26 8 9 Alarm delay time entr erede id agrees 26 8 10 Reset alarm enable oiire 27 8 11 Using an alarm example sese nemen 27 Section 9 COUNTER PARAMETERS tere os toe ex edo Faro ER Tad E Rare Re RR 29 9 Gounter value rnit 29 9 2 Counter mode zt re RR ER DUREE RE RARI 29 9 3 Counter Setpoint mode ssssssssssssssss eene eere nennen 29 9 4 Counter new SetpOint cccececcececeeeeeceeeeeceeeeeeeeecaaaaaeceeeeeeesecaeaeeeeeeesetsenesaeeeeees 29 9 5 Counter limit oorr ine tian s 29 9 6 Counter output 6 nennen 29 30 9 6 Counter UTE SING 30
37. nter unit Parameter used to select a unit from certain sensor type pointer to a unit Default setting is 0 In for sensor type 3 Sensor 7 type a na 2 o m uw ko na na na na na na na na na ne 9 8 Counter unit string Parameter CntrUntstr consisting of 4 characters string with selected unit out of table Read only parameter 9 9 Using a counter example Using the counter will take three steps 1 Preparing the instrument setting correct values for mode limit etc 2 Monitoring the alarm info byte gives info which alarm has occurred 3 Resetting the counter will re initialize the counter and set output to normal values again All settings needed are secured parameters These parameters can only be changed if a key parameter init reset value has been send first to get the instrument in a soft init mode It will stay in this mode until a new power up situation Using a batch counter The measured signal will be integrated in time and there will be a check on a certain limit set by the user Example You have an instrument with a range of 1 In min Setting the batch to be reached on 1000 In Relay TTL output should do nothing New setpoint wanted at reaching the limit is 096 valve should be closed Reset should be enabled via BUS RS232 or by means of keyboard micro switch Through Modbus or RS232 links send following parameter values counter outputmode 0 LENS
38. nto the most significant bit MSB position The LSB is extracted and examined If the LSB was a 1 the register is then exclusive ORed with a preset fixed value If the LSB was a 0 no exclusive OR takes place This process is repeated until eight shifts have been performed After the last eight shift the next 8 bit byte is exclusive ORed with the register s current value and the process repeats for eight more shifts as described above The final content of the register after all the bytes of the message have been applied is the CRC value When the CRC is appended to the message the low order byte is appended first followed by the high order byte A detailed example of CRC generation is contained below 6 3 CRC Generation The Cyclical Redundancy Checking CRC field is two bytes containing a 16 bit binary value The CRC value is calculated by the transmitting device which appends the CRC to the message The device that receives recalculates a CRC during receipt of the message and compares the calculated value to the actual value it received in the CRC field If the two values are not equal an error results The CRC is started by first preloading a 16 bit register to all 1 s Then a process begins of applying successive 8 bit bytes of the message to the current contents of the register Only the eight bits of data in each character are used for generating the CRC Start and stop bits and the parity bit do not apply to the CRC During gener
39. of the setpoint The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table Give 100 Setpoint Command 050301010407 lt CR gt lt LF gt gt c 0403000004 Cr Gives a 100 Setpoint to the Digital Mass Flow Controller regardless of the analog setpoint The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table Purge Valve Command 050301010408 lt CR gt lt LF gt gt 0403000004 lt Cr gt Opens the valve fully of the Digital Mass Flow Controller regardless of the setpoint The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table 22 SECTION 7 Give 0 Setpoint Command 05030101040C lt CR gt lt LF gt __ gt gt EE REESE 0403000004 lt Cr gt Gives a 0 Setpoint to the Digital Mass Flow Controller regardless of the analog setpoint The next to last byte in the string returned should be 00 if it is not an error has occurred Refer to Error Codes Table RS 232 Setpoint Mode Command 050301010412 lt CR gt lt LF gt gt E EE aa ane 0403000004 Cr Puts the Digital Mass Flow Controller in RS 232 Setpoint Mode In this mod
40. owing command reset 2 To inactivate the alarm put it in alarm mode off This will also reset your outputs This can be done sending command alarm mode 0 28 SECTION 9 COUNTER PARAMETERS 9 1 Counter value Actual counter value in units selected at Counter unit Value is a float in IEEE 32 bits single precision notation 9 2 Counter mode Available counter modes for device Value Description 0 Off 1 counting upwards continuously 2 counting up to limit batchcounter Default value 0 9 3 Counter setpoint mode Setpoint change enable during counter limit batch situation until reset Default 0 Value Description 0 no setpoint change at batch limit allowed 1 setpoint change at batch limit allowed 9 4 Counter new setpoint New safe setpoint at counter limit batch situation until reset See measure for range Normally this value is set to 0 9 5 Counter limit Counter limit batch in units selected at Counter unit Value is a float in IEEE 32 bits single precision notation Default setting is 1000000 In 9 6 Counter output mode Parameter to determine counter relais TTL output activity mode when limit batch has been reached Default setting is 0 Value Description 0 no relais TTL output activity at batch limit 1 relais TTL output pulses after reaching batch limit until reset 2 relais TTL output activated after reaching batch limit until reset 29 SECTION 9 9 7 Cou
41. position of the model code For Turck receptacle and mating cordset information see primary technical and user s manual for this device function S 3 4 6 COMMON RS485 15 24V power supply 1 Ek Note Shielding is achieved through connector body The device needs line polarization on the RS485 network The polarization should be implemented on the Modbus master A termination is required at the end of the Modbus network segment The maximum number of devices on a network segment without repeater is 127 SECTION 2 2 2 Termination For best quality of data transfer Modbus should be terminated correctly 2 2 1 Termination resistors A resistor is added in parallel with the receiver s A and B lines in order to match the data line characteristic impedance specified by the cable manufacturer 120 Q is a common value This value describes the intrinsic impedance of the transmission line and is not a function of the line length A terminating resistor of less then 90 Q should not be used Termination resistors should be placed only at the extreme ends of the data line see Termination schematics resistors RT1 and RT2 and no more than two terminations should be placed in any system that does not use repeaters 2 2 2 Biasing resistors When an RS 485 network is in an idle state all nodes are in listen receive mode Under this condition there are no active drivers on the network All drivers are tri stated Without
42. ss and baud rate and perform simple commands via the RS232 connection See Section 4 Alternatively you can use the RS232 connection and a host terminal program to perform the same set of command functions Details in the table below and samples below Commands to use with an RS232 connection and a host terminal program e g ProComm Command Comment Returned message 0603010121xxxx lt Cr gt lt Lf Write Setpoint Returns 0403000005 lt Cr gt gt 06030401210121 lt Cr gt lt Lf Read Setpoint Returns 0603020121xxxx lt Cr gt gt 06030401200120 lt Cr gt lt Lf Read Flow Signal Returns 0603020120xxxx lt Cr gt gt 050301010401 lt Cr gt lt Lf gt Put controller into Analog Returns 0403000004 lt Cr gt Input mode 050301010403 lt Cr gt lt Lf gt Close valve Returns 0403000004 lt Cr gt 050301010407 lt Cr gt lt Lf gt Give Setpoint of 100 Returns 0403000004 lt Cr gt 050301010408 lt Cr gt lt Lf gt Purge valve fully open Returns 0403000004 lt Cr gt 05030101040C lt Cr gt lt Lf gt Give Setpoint of 0 Returns 0403000004 lt Cr gt 050301010412 lt Cr gt lt Lf gt Put controller into RS 232 Returns 0403000004 lt Cr gt Setpoint mode 050301010400 lt Cr gt lt Lf gt Put controller into Bus Returns 0403000004 lt Cr gt Input mode HOST DIGITAL CONTROLLER Write Setpoint Command 0603010121xxxx lt CR gt lt LF gt gt
43. subfunction is 100 bytes at 9600 baud 200 bytes at 19200 baud and 400 bytes at 38400 baud When this size is exceeded corrupted responses may be received Possible exception responses 701 ILLEGAL FUNCTION in case of not supported sub function 703 ILLEGAL DATA VALUE in case of an incorrect value for the data field 304 SLAVE DEVICE FAILURE in case of writing illegal value to register 3 3 5 Report Slave ID 17 The Slave ID field in the response is a string with the indent number version nr serial nr The Run Indicator Status field in this message will indicate ON when the device is in normal operating mode FB NORMAL Possible exception responses 1104 SLAVE DEVICE FAILURE in case of an internal error SECTION 3 3 4 Available parameters Modbus registers in the data model are numbered from 1 to 65536 In a Modbus PDU Protocol Data Unit these registers are addressed from 0 to 65535 This addressing model has been described in section 4 4 of 1 The following table lists the most commonly used parameters Details and meaning can be found in the Porter Digital Series Technical and Users Manual FM 1114 MODBUS REGISTERS PARAMETER PARAMETER NAME TYPE ACCESS PDU ADDRESS REGISTER NUMBER REMARK Setpoint slope oxoozs 35 Analog input Unsignedint R oxoozs_ 0x02 36 Alarm output mode RW 0x0C25 3 09 Alarm setpoint mode oxoc26 300 odi 9 pou Lc GE MODBUS REGISTERS
44. ter Type Error 15 Error serial port connection 06 Parameter Value Error 16 Error opening communication 07 Network Not Active 17 Communication error 08 Time out start character 18 Error interface busmaster 09 Time out serial line 19 Time out answer OA Hardware memory error 1A No start character OB Node number error 1B Error first digit OC General communication 1C Buffer overflow in host error 1D Buffer overflow OD Read only parameter 1E No answer found OE Error PC communication 1F Error closing OF No RS 232 connection communication 20 Synchronization error 21 Send error 22 Protocol error 23 Buffer overflow in module 24 SECTION 8 ALARM STATUS PARAMETERS 8 1 Alarm info This parameter contains 8 bits with status information about some alarm events in the instrument Bit Meaning 0 no error 1 Warning message in alarm warning status register 0 no error 1 This bit only Power up alarm probably power dip occurred Together with bit 2 or bit 3 Response alarm message setpoint measure too much difference bit 2 or bit 3 indicate if difference is positive or negative 0 no error 1 Master slave alarm master output signal not received or slave factor out of limits gt 100 0 no error 1 Hardware alarm check hardware 8 2 Status This parameter is a special byte for monitoring communication between converter and instruments via BUS It contains 8 bits with information about c
45. utomatically read values and allow you to perform the commands via button selections on the screen Using the Modbus details and Visual Basic examples below and the Modbus registers table from Section 3 you can expand commands in your own host computer program to utilize the full capability of the Porter Digital Series Meters and Controllers 6 1 MODBUS Message RTU Framing A MODBUS message is placed by the transmitting device into a frame that has a known beginning and ending point This allows devices that receive a new frame to begin at the start of the message and to know when the message is completed Partial messages must be detected and errors must be set as a result In RTU mode message frames are separated by a silent interval of at least 3 5 character times In the following sections this time interval is called t3 5 Frame 1 Frame 2 Frame 3 BALH kal iat i 3 5 char at least 3 5 char t least 3 5 cHar HELL 4 5 char t MODBUS message gt 3 5 char 8 bits 8 bits N x 8 bits 16 bits gt 3 5 char Figure 13 RTU Message Frame 15 SECTION 6 The entire message frame must be transmitted as a continuous stream of characters If a silent interval of more than 1 5 character times occurs between two characters the message frame is declared incomplete and should be discarded by the receiver Frame 1 OK Frame 2 NOK to _ Herera lt 1 5 char 1 5 char
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