Dual DPT Technical manual
Contents
1. 12 Technical manual DUAL DPT Request 0b03200000018f60 Response 0b030200002045 0x0b Slave address 1 byte 0x03 Function code 1 byte 0x2000 Address 2 bytes 0x0001 Quantity 2 bytes Ox8f60 CRC 2 bytes 0x0b Slave address 1 byte 0x03 Function code 1 byte 0x02 Quantity 1 byte 0x0000 Value1 2 bytes 0x2045 CRC 2 bytes Page 13 lechnical data Technical specification DUAL DPT Power supply Temperature range Relative humidity Cabinet protection Differential pressure transducer Pressure measurement Air connection Overpressure Accuracy Resolution Onboard temperature sensor Accuracy Resolution External temperature sensors Temperature range Accuracy Resolution Communication Weight Dimensions Mounting Housing material Page 14 12 VDC to 32 VDC Via RS485 port 25 C 85 C Max 95 RH non condensing IP54 2 0 250 Pa 0 1250 Pa Air only Tube inner diameter of air hose 5 mm Max 8 kPa 0 250 Pa 2 25 fullscale 6 Pa 0 1250 Pa 1 5 fullscale 19 Pa incl aging temperature drift and conversion 1 Pa 1 30 C 70 C C 1 C Option of 2 NTC Signal and Gnd 50 C 99 C 3 C in the range 50 C 36 C 1 C in the range 35 C 49 C 3 C in the range 50 C 99 C lt 1 0 C in the range lt 35 C lt 0 2 C in the range 35 C 39 C lt 1 0 C in the range 40 C 85 C lt 1 5 C in the range2. MEME MEME ME E 19 Page 2 Technical manual DUAL cer Page 3 Read this first The contents of this manual are subject to change without notice Lodam electronics holds the copyright to this user s manual The user shall follow any instructions given in this user manual entirely and not only partly Any non follow ing of this user manual result in exclusion of all warranties guarantees and liabilities CopyrightO 2014 by Lodam electronics a s All Rights Reserved Disposing of the parts of the controller INFORMATION FOR USERS ON THE CORRECT HANDLING OF WASTE ELECTRI CAL AND ELECTRONIC EQUIPMENT WEEE In reference to European Union directive 2012 19 EU and the related national legislation please note that 1 WEEE cannot be disposed of as municipal waste and such waste must be collected and disposed of sepa rately 2 The public or private waste collection systems defined by local legislation must be used In addition the equip ment can be returned to the distributor at the end of its working life when buying new equipment 3 The equipment may contain hazardous substances the improper use or incorrect disposal of such may have negative effects on human health and on the environment 4 The symbol crossed out wheeled bin shown on the product or on the packaging and on the instruction sheet indicates that the equipment has been intro duced onto the market after 13 August 2005 and that it must be disp
3. Off 7 Parity on off On off 6 Parity even odd Even Odd 5 Stopbits 1 2 4 Jan Baudrate Bit pattern Baudrate vawe switch a 115200 300 1200 4800 9600 19200 38400 115200 o O A NPD o e o Page 11 6 10 Status information The following input registers hold status for the module Bitmask field 0x0001 Stopped Input Stopped Device stops performing its regulation Operation Dono 0x0002 Started register Started Device is performing its regulation 0x0008 Error 0x0080 Restarting 0x0000 0xFFFF T Input Application error codes Eres Uie DACIE register BO Reflects a previous Opsignal command Opsignal 6 11 MODBUS sample communi cation Note The following sample is a general MODBUS commu nication sample and is not for the DUAL DPT Request 0b041000000e75a4 Response ObO4lcffffQ000095008b0e4a80014000b000108e 108fIffffOOOf 0002fff39f8e OxOb Slave address 1 byte 0x04 Function code 1 byte 0x1000 Start addr 2 bytes 0x000e Quantity 2 bytes 0x75a4 CRC 2 bytes OxOb Address 1 byte 0x04 Function code 1 byte Oxic NB bytes of data 1 byte Oxffff Value1 2 bytes 0x0000 Value2 2 bytes 0x0950 Value3 2 bytes 0x08b0 Value4 2 bytes 0xe4a8 Value5 2 bytes 0x0014 Value6 2 bytes 0x000b Value 2 bytes 0x0001 Value8 2 bytes 0x08e1 Value9 2 bytes Ox08f1 Value10 2 bytes Oxffff Value11 2 bytes 0x000f Value12 2 bytes 0x0002 Value13 2 bytes Oxfff3 Value14 2 bytes Ox9f8e CRC 2 bytes Page
4. gt 85 C 1 RS485 port dual connection Half duplex max 115 kB Receiver Rin gt 12 kOhm 80g 103 0 mm w 85 6 mm d 33 mm h With two screws PC Lexan transparent Technical manual DUAL wj O Drawings i E i ds E A f M VA AN e cc A TA c LJ CX If IT IL I Y sil es 68 4 mu 8 36 a M 91 103 7 Ro atado sm r TU bla dha 04 ml La Page 15 9 Standards The product is manufactured according to the following standards RoHS 2011 65 EC Low voltage 2006 95 EU EMC 2004 108 EC 61000 6 x Generic EMC The following standards have been used EN 61010 1 Safety requirement for electrical equipment for measure ment and control EN 61000 6 2 Immunity standard for industrial environments EN 61000 6 3 Emission standard for residential commercial and light industrialenvironments CE approved Page 16 10 Trouble shooting Check if there is power to the DUAL DPT range 12 VDC to 32 VDC Check if the communication address setting matches the selected Note Address O shou
5. position 300 Pa for the DPT 1250 150 Pa for the DPT 250 When calibrated the Calibrate register is reset to O If the calibration is rejected the value of Calibrate is set to 1 6 3 Pressure readings Read the following two input registers regardless if it is a Dual DPT 250 or a Dual DPT 1250 Address Possible Register Description Values type Pressure reading transducer 1 Pressure1 0x0003 0 to 1250 Input register Pa signed short integer Pressure reading transducer 2 Pressure2 0x0004 O to 1250 Input register Pa signed short integer 6 4 Temperature readings Read the following input registers regardless if itis a Dual DPT 250 or a Dual DPT 1250 Address Possible REST Default Description Values type 10000 to Templnternal 0x0005 c dig Input register Gar Ado ne R 10000 to External NTC sensor input 1 mai 0x0006 EE or metis Je WALE ea 15000 short circuit TempExter ROD Tues CES lt a nal2 waco Cu 100 linpui regjister E 7000 not connected 15000 short circuit Page 9 6 5 Hardvvare information HWType CmdReply Status Cmd Address Baudrate Stopbits Parity OxFFO6 OxFFO7 OxFFO8 OxFF80 OxFF81 OxFF82 OxFF83 OxFF84 0x0020 DPT1250 Dual Ox0021 DPT 250 Dual 0x0027 DPT1250 Single 0x0028 DPT 250 Single Ox00 Nothing 0x02 Programming Done 0x82 Programming Error 0x03 Going to Application mode 0x83 Cannot go to applicati
6. 674 1876 1341 975 720 540 401 315 Page 17 12 Index A Air connection 14 C Cabinet protection 14 Communication 14 Communication modes 11 Connections 6 Connection samples 6 D Definitions 5 Dimensions 14 Dipsvvitches 10 Dravvings 15 E External temperature sensors 14 F Function 7 H Hardware information 9 Housing material 14 How to 6 M MODBUS 7 MODBUS communication 12 N NTC temperature resistance table 17 O Onboard temperature sensor 14 Overpressure 14 P Power supply 14 Pressure measurement 14 Pressure readings 9 Pressure sensor calibration 9 Page 18 R Relative humidity 14 S serial number of the module 10 Standards 16 Status information 12 1 Technical data 14 Temperature range 14 Temperature readings 9 Trouble shooting 16 VV Weight 14 Technical manual DUAL DPT 13 Notes Page 19 Innovative and energy saving climate control When it comes to climate control Lodam is one of the most experienced you can turn to For more than four decades we have developed produced and implemented electronic solutions dedicated to optimising applications like Compressors Condensing units Heat pumps Air conditioning Refrigerated truck and trailer Reefer containers We know the importance of reliable energy efficient operation and constantly push techno logical boundaries to bring you the most innovative and forward thinking solutions As part of the BITZE
7. R Group we are backed by one of the world s leading players in the refrigeration and air conditioning industry This alliance provides us with extensive network and application knowhow and allows us to stay at the forefront of climate control innovation And to help ensure comfortable surroundings for humans and reliable protection of valuable goods anywhere in the world Lodam electronics a s Kaervej 77 Tel 45 7342 3737 6400 Sanderborg Fax 45 7342 3730 Denmark lodam lodam com For more information visit www lodam com 27 02 2015 Contents are subject to change without notice
8. ZLodam BY BITZER GROUP UN 7 q dg Lo 4 ae CS a o Tp Dual Differential Pressure tranducer Technical manual 5 m DUAL DPT Version 3 0 24 Contents ls Read thiSTIST gt uites oerte rete hurts ttg e gaudes bet a Ga 4 1 1 Reading instructions eee 4 12 Userrnarn al stada eiae c e i Gos a da 4 2 General eR REPRE 5 3 Definitions 5 HETT 5 4 HOWIOns E 6 Du COMMCCTIONS sc EE 6 O FUNC HOM m 7 6 1 Overview of Modbus functions 2 0 00 cece cee e eee e tee eeeeeeees 8 6 2 Pressure sensor calibration cece cece aaa 9 6 3 Pressure readings eee 9 6 4 Temperature readinss eee 9 6 5 Hardware information 10 6 6 Reading the serial number of the module 10 6 7 Dipswitches iaia eina 11 6 8 MODBUS address setting 11 6 9 Communication modes iii n 6 10 Status Information aaa E et Cents cR eei A ad 12 6 11 MODBUS sample communication 12 7 Technical data eee eed be e ena Hn dici enden grape st e Rd ed 14 8 DIAWIMES rescat crise querentes P I IH Re ERU at e a 15 O Standards ptt mood ERO em tuia tun iue adt 16 10 Tro ble Shooting oreet er oce a oder te vids d eot bert aded tel 16 Tl NTC temperature resistance table 17 IDEE 18 ISSINOIBS UI Uu ERES I
9. done 4 Store filter constant done 131 Load filter constant error 132 Store filter constant error write Ox0000 Ready Ox0001 Stop Ox0002 Start Ox0008 Reset Error 0x0080 Restart Calibrate pressure sensors Writing OXOI calibrates pressure sensor Read signed short int 1 Failed O Calibration success T Calibrate 2 Using calibration value from eeprom 3 Not calibrated Oto50 Oto50 Application Commands O Ready 1 Clear 4 Load filter constant 5 Store filter constant 4 1250 Pa Dual 5 250 Pa Dual 6 1250 Pa Single 7 250 Pa Single Register type Input register Input register Input register 0x0000 Input register Input register Input register Input register Input register Input register Input register Input register 0 Input register Holding 0x0000 register Holding register Holding register Holding register Holding 0x0000 register Holding register Unused Stopped Device stops performing its regulation Started Device is performing its regulation Application error codes Reflects a previous Opsignal com mand Pressure reading transducer 1 Pa signed short integer Pressure reading transducer 2 Pa signed short integer Onboard temperature sensor OC signed short integer External NTC sensor input 1 OC signed short integer 000 not connected 15000 short circuit External NTC sensor input 2 9C si
10. gned short integer 7000 not connected 15000 short circuit Dip switch Com reading Dip switch Com reading Dirty flag for FilterC1 FilterC2 Application command reply Ready Commands can be issued the sensor is always running Stop regulation Start regulation Reset operation error message Restart reboot after 3 seconds Filter constant in seconds Use AppCmd to store setting Filter constant in seconds Use AppCmd to store setting Application Commands See AppCmdReply for reply to AppCmd 1 Clear AppCmdReply 4 Reload filter constants 5 Update and store filter constants Internal value don t change Technical manual DUAL DPT Ox0000 Bootstrapper AppType OxFFOO 0x0001 Bootloader Input register 0x0002 Application type 0x0002 Application 0x0018 DPT1250 Dual 0x0019 DPT 250 Dual s US AppID OXFFOI 0x0022 DPT1250 Single Input register 0x0000 Application ID 0x0023 DPT 250 Single Ee OxFFO2 0x0000 OxFFFF Input register SW release number SWVersion OxFFO3 0x0000 OxFFFF Input register SW version number SWLevel OxFFO4 Ox0000 OxFFFF Input register SW level number SWPatch OxFFO5 Ox0000 OxFFFF Input register SW patch number 6 2 Pressure sensor calibration To ensure a better accuracy the DPT transducers can be calibrated Calibration is initiated by writing OXO1 to the Calibrate register It is possible to calibrate the sensor if the pressure is within resting
11. ical manual DUAL wj 6 7 Dipswitches There are two DIP switches on the pcb one for MODBUS Address and one for Com mode baud rate etc The DIP switches are only read during start up and the values for Com mode and address are used Any changes on any DIP switch after start up will have no influence on the running system Dip switch COM Mode Address 8 7 6 5 4 3 2 1 8 17 61 51141 18112111 Numbers are those printed on the DIP switch A DIP switch is on 1 if itis in the ON position 6 8 MODBUS address setting Modbus address is selected using the 8 bit dipswitch labelled adr on the pcb Address O can not be selected since it is the broadcast address and it will be defaulted to address 23 for the DPT1250 and address 24 for DPT250 Address o EE NON O EN E BR E Msb Lsb 6 9 Communication modes Communication speed parity stop bits is selected using the dipswitch labelled COM on the pcb Se also the label in section 5 Connections on the module COM Mode 811 1161 5114 3 2 11 Msb Lsb If no COM mode is selected it is defaulted to 115200 baud 1 stop bit and even parity Switch Description EET TE On 8 RS485 Termination
12. in the following sections Client Server Initiate request pump Bi Perform the action Initiate the response Receive the response MODBUS configuration register layout Specification of the protocol Protocol Modbus RTU mode Please see http Awww modbus org specs php Modbus address DUAL DPT 1250Pa uses default address 24 DUAL DPT 250Pa uses default address 25 Baud rate Default 115200 but 9600 and 19200 are selectable Number of data bits 8 Number of stop bits Default 1 but 2 is selectable Parity Default Even but None and Odd are selectable Page 7 6 1 Overview of Modbus functions Reserved Operation ErrCode Pressure Pressure2 Templn ternal TempEx ternall TempEx ternal2 DIPCOM DIPADDR AppStatus AppCm dReply OpSignal Calibrate FilterC1 FilterC2 AppCmd Sensor Type Page 8 0x0000 0x0001 0x0002 0x0003 0x0004 0x0005 0x0006 0x0007 0x0013 0x0014 0x0015 0x0016 0x0800 0x0801 0x0802 0x0803 0x0805 0x0806 Bitmask field 0x000 1 Stopped 0x0002 Started 0x0008 Error 0x0080 Restarting 0x0000 0xFFFF 0x0085 Wrong Opsignal O to 1250 Oto 1250 10000 to 20000 Scale 100 10000 to 20000 Scale 100 10000 to 20000 Scale 100 Oto 127 Oto 255 O If nothing changed 1 If FilterC1 of FilterC2 is changed and not stored yet O Ready 3 Load filter constant
13. ld not be used Check if the communication speed matches the select ed Check if communication is running The green LED is flashing regularly at start up and when no communi cation is active It flashes irregularly together with the normal flash frequency when communication is active Technical manual DUAL DPT I NIC temperature resistance table The DUAL DPT temperature inputs are for a NTC temperature sensor The curve for a standard Lodam NTC temperature sensor is used The table below shows the relation between temperature and measured resistance in the NTC sensor and can be used to measure if the read temperature matches the measured resistance Resistance is in Ohm and temperature is in 9C The right columns lists the resistance at a temperature of the left most column plus the temperature in the heading of the right column i e O9C 2 C 440C etc 667828 579718 40 335671 294193 30 176683 156199 20 96974 86415 10 55298 49663 0 32651 29500 10 19904 18093 20 12494 11420 30 8056 7402 40 5325 4916 50 3601 3339 60 2487 2315 70 1752 1637 80 1256 1178 90 916 862 100 679 640 110 510 483 120 389 369 504230 258307 138322 17121 44610 26688 16465 10450 6807 4542 3098 2157 1530 1105 811 604 457 350 439445 227196 122687 68927 40150 24173 15001 9572 6266 4200 2877 2011 1432 1037 768 571 433 332 383712 200184 108991 61693 36183 21922 13683 8777 5774 3887 2
14. on mode 0x04 Going to Bootloader mode 0x84 Cannot go to bootloader mode Ox8F Function not supported O Cfg Not dirty 1 Cfg Dirty O Nothing Clear 1 Clear CmdReply 0 2 Program Configuration 3 Set Application mode and Input register Input register Input register reboot wait 3 sec a 4 Set Bootloader mode and E reboot wait 3 sec 5 Reset communication to factory settings OxOOXX Holding register Ox0001 9600 I 0x0002 19200 del 0x0003 115200 8 Holding Us register i Dos Holding 2 Odd register Note 1 Selected using DIP switches 6 6 Reading the serial number of the module Serial number is exchanged using Modbus files To support the Modbus files layout a device must implement Modbus function 0x14 read and Ox15 write Read only files RO are identified in the range from OxFFOO to OxFF7F and Read Write files RW are identi fied in the range from OxFF80 to OxFFFF Standard Modbus files Payload File num Record Descrip ber number n do tion perau yte OxFF80 0x0000 0 31 PCBA S N gt Module OxFF80 0x0001 0 31 S N Page 10 Ox001C 0x0000 0x0000 0x0000 Ox0012 Ox0003 115200 1 Even Reply to a command in Cmd register If any register from OxFF80 upwards has changed this field reflects the dirty status Cmd returns to O when a command has been executed Read only 1 Read onlyl Read onlyl Read onlyl Techn
15. osed of separately 5 In the event of illegal disposal of electrical and elec tronic waste the penalties are specified by local waste disposal legislation Page 4 1 1 Reading instructions The following symbols are used to draw the reader s attention to different warning levels E Important information Danger General danger 1 2 User manual Before installation the user should be thoroughly familiarized with this user manual especially with purposes installation and operation Special care should be taken when installing and connect ing external equipment air hoses and MODBUS com munication cables and handling the modules correctly according to protection against ESD Installation of the DUAL DPT must be performed by authorized personnel only All warranties are excluded in case installation is performed by unauthorized personnel or in case the DUAL DPT has not been correctly installed Technical manual DUAL DPT 2 General The DUAL DPT Differential Pressure Transducer is a general purpose differential pressure transducer for measuring air pressure The DUAL DPT has tvvo integrat ed pressure sensor elements Application areas could be ventilation systems for mon itoring filter status and this way tell the actual pollution level of the filter Another area could be to measure pressure levels to obtain maximum efficiency and reliabil ity of fans The DUAL DPT has also an in
16. t DUAL DPT on the bus must therefore be terminated with the on board 120 Ohm termination resistor using DIP switch number 8 on the COM DIP switch Power for the DUAL DPT is taken from the RS485 connection Page 6 5 Connections Connections on the module Label inside the Dual DPT module a Ratings N VDC 12VDC to 32VDC Temp2 Temp 1 Please see manual for complete data a a a NTC tem NTC temp2 NTC temp1 NTC tem COM Addres Selector Selector See Manual See Manual Adr128 E Adr64 Z 4 3 2 1 4 3 2 1 Adr32 E6 oooo oooo JE Baudrate Adr8 JCZ1 Gnd B A VDC Gnd B A VDC Baudrate Adr4 EZ Modbus Modbus Baudrate Adr CO Baudrate Adrl X Default 8xOFF E Note The External Supply is a future option 4VDC Future option External power supply 12 VDC 32 VDC Gnd Future option Neutral Temp1 NTC element 1 two wires Temp2 NTC element 2 two wires 2 connections same port Used for wiring looping to NE the next DUAL DPT unit Gnd Neutral B Data inverted signal A Data signal 4VDC Power supply via RS485 12 VDC 32 VDC COM selector 8 bit Dip switch for setting communication settings and Baud rate Address Setting the Modbus address in the range selector 1 254 Technical manual DUAL wj O FUNCTION Communication with the DUAL DPT is via MODBUS RTU Configuration and reading of pressures and temperatures from the DUAL DPT is described
17. ternal temperature sensor and connection for two external NTC temperature sensors allowing measurement of the temperatures where the pressures are measured With one DUAL DPT two pressures and two temper atures can be measured with just one unit This ensures a simple installation and reduces the space needed All connections are from one side Communication with the DUAL DPT is via MODBUS RTU over RS485 3 Definitions Product range ESD Electro Static Discharge HW Hardware electronics MODBUS Application layer messaging protocol http www modbus org specs php NTC Negative Temperature Coefficient RS485 Hardvvare communication standard Page 5 A HOW tO Connection samples The DUAL DPT is connected using a 4 wired connector RS485 There is 1RS485 port but it is with two connections so the MODBUS signal can be looped on to the next device without having to use double wires in the terminals One master controller and one DUAL DPT MODBUS RTU via RS485 Master DUAL Termination 120 Ohm Controller DPT sblivated One master controller and two DUAL DPT MODBUS RTU via RS485 4 Master DUAL Controller DPT MODBUS RTU via RS485 DUAL Termination diis 120 Ohm activated To ensure proper operation of the MODBUS communica tion both ends of the communication link must be termi nated with a 120 Ohm resistor The las
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