GW-7228 J1939/Modbus RTU Slave Gateway
Contents
1. Register Offset Data Length PGN Priority Address Update Rate Message Offset ECU s 0 61442 3 6 J1939 Input Input Register Data zzy EA Update Rate a Message Off J1939 Address i pas Byte Order Order In In J1939 61442 6 1 11939 Output Tabl SE Reg Data Length GN es D Ra GE Oo Modbus Ke Data Field WM Figure 5 11 J1939 configuration screen GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 42 5 2 4 Upload Parameter to the GW 7228 After the previous parameter settings users need to upload the parameters to the GW 7228 Please refer to the following figure to finish the operation Load Configuration Configurati Save Learns Modbus RTU Slave Date Created 20100722 Firmware Version 1 02 Figure 5 14 Parameter upload successful screen GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 43 5 3 Modbus Communication Set J1939 output data Using the Modbus command as below FC16 Write multiple registers 4xxxx for AO Request Request by Modbus master device Byte 0 Byte 1 Byte 2 3 Byte 4 5 Byte 6 Byte 7 B 6 Net ID Station number FC 10 Hex Reference number Word count Byte count B 2 x word count Register values Byte B 7 B 8 Value for the CRC calculation Response Response from the GW 7228 Byte 0 Byte 1 Byte 22. When users execute the GW 7228 Utility it will show connection function screen first for connecting to the GW 7228 as Figure 3 1 The following is the illustration for connection parameters 1 COM The serial com port number COM1 COM32 2 Baud Rate Serial com port baud rate setting 2400 115200 bps default 1 15200 3 Parity Serial com port parity setting NONE ODD EVEN default NONE 4 Net ID Modbus network Net ID setting 1 250 default 1 5 Data Bits Serial com port data bits setting Fixed at 8 6 Stop Bits Serial com port stop bits setting 1 2 default 1 Connection Connect to GW 7228 COM COMI v Baud Rate 115200 v Parity NONE bead ye Net ID 1 el j Data Bits hd Stop Bits l Figure 3 1 Connection Screen of GW 7228 Utility After finish the connection setting please click Connect button to connect to the GW 7228 module GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 21 If the connection settings external wiring and the GW 7228 module are normal it shows connection successful screen as Figure 3 4 The GW 7228 status such as Interface Data Created Error Firmware Version would be shown otherwise it shows abnormal connection screen as Figure 3 2 and Figure 3 3 Warnning d Open COM Error Error code 65533 Figure 3 2 Open COM Error Screen Warnning dd COM3 Connect Err
3. J1939 is a higher layer protocol based on Controller Area Network CAN It provides serial data communications between microprocessor systems also called Electronic Control Units ECU in any kind of heavy duty vehicles The messages exchanged between these units can be data such as vehicle road speed torque control message from the transmission to the engine oil temperature and many more 4 2 1 Communication Methods The GW 7228 provides two communication methods of SAE J1939 each serving a specific purpose Destination Specific Communications Destination specific communications use PDU1 but also the global destination address 255 There are cases where this method will require the utilization of destination specific Parameter Group Numbers for instance in the case of more than one engine A torque message for example must be sent only to the desired engine and not to both Broadcast Communications Broadcast communications use PDU2 and as the name implies they can include Sending a message from a single or multiple sources to a single destination sending a message from a single or multiple sources to multiple destinations 4 2 2 Parameter Groups Parameters groups are for instance engine temperature which includes coolant temperature fuel temperature oil temperature etc The Parameter Groups PG architecture and Parameter Group Numbers PGN are described in SAE J1939 21 and defined in SAE J1939 71 GW 7228 J1
4. Systems Transmission RS 232 RS 422 RS 485 PGN 61442 SPN 161 Figure 5 1 Application network structure 5 1 Hardware Installation Users may need to make some hardware settings before the application The detailed illustration is as below Step1 Check GW 7228 Firmware Mode In operation mode users can use the Modbus Master command to send and receive J1939 messages via the GW 7228 Users need to set the dip switch to the Normal position as Figure 5 2 and reset the power and that the GW 7228 can run in the operation mode GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 36 Init Normal Figure 5 2 Operation mode Position of Dip Switch Step2 Enable the 120Q terminator resistor Please open the GW 7228 cover and use the JP3 to activate the 1209 terminal resistor built in the module as the Figure 5 3 Figure 5 3 JP3 Jumper Position GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 37 Step3 J1939 network CAN bus connection Connect the CAN ports with the GW 7228 modules and ECU e g engine in J1939 network using the following structure as Figure 5 4 HD10 9 1939P LHCE GW 7228 wmonaus J1939 Modbus RTU Slave Figure 5 4 CAN bus Wire Connection Step4 Modbus network Serial port connection It is recommended to use only one serial port RS232 RS422 or RS485 of the gateway at the same time
5. The following figures describe the three COM port types to a serial device via serial network GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 38 250K bps Baud Rate of CAN Variable Baud Rate of RS 232 485 422 2400 9600 115 2K Support Modbus RTU Slave Protocol Selectable 1200 terminal resistor J99 Bink 1999 Date Tranemission 3kV VDC Isolation on CAN Side RS 485 Device RS 422 Device RS 232 Device Figure 5 5 Serial Port Wire Connection Step5 Power wire connection Connect the power supply to the GW 7228 module s power terminal connecter please see the following connection as Figure 5 6 3KV VUL ISOl4tIOn On LAN gt IGe rr d gt Vs GND 10v 30v VDC Figure 5 6 Power Wire Connection GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 39 Step6 Connect to GW 7228 When in the first connection the controller must run the network at 115200 baud with none parity 1 stop bit and 1 Net ID shown as below figure After the first connection it should follow the GW 7228 Modbus connection settings to change Connection Connect to GW 7228 COM COMI ei NetID ei Baud Rate 115200 el Data Bits b Parity NONE Stop Bits 1 Figure 5 7 Connection Setting of GW 7228 Utility 5 2 GW 7228 Utility Configuration 5 2 1 Modbus Network Configuration The GW 7228 and the controller must be set the sa
6. GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 15 2 6 2 Firmware Operation Mode In the operation mode users need to set the dip switch to the Normal position as Figure 2 16 and reset the power The GW 7228 can run in the operation mode In this mode users can use the Modbus Master command to set get J1939 messages via COM port Init Normal Figure 2 16 Normal Position of Dip Switch GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 16 2 7 LEID Indication There are three LEDs to indicate what state the GW 7228 is in The following is the illustration of these three LEDs and the position of these three LEDs shown as Figure 2 17 1 PWR LED It is used to help users to check whether the GW 7228 is standby If the module is working in firmware operation mode the PWR LED is always turned on It is also used for demonstrating an error that has occurred The PWR LED is normally turned on when the module works in a good condition When the Bus Off error is happened the PWR LED will blink per 500 ms until the Bus Off condition disappears If the CAN message can t be sent out successfully then the PWR LED will blink per 100 ms 2 J1939 LED It is used to show whether the GW 7228 is transmitting receiving CAN messages The J1939 LED will blink whenever a CAN message is sending or receiving 3 MODBUS LED It is used to sh
7. Serial port connection Connect the PC running GW 7228 Utility to the GW 7228 module by using a standard serial cable between the PC serial port and the screw terminal connector on the module The GW 7228 offers three serial interfaces to the user and not through any setting It is recommended to use only one serial port RS232 RS422 or RS485 of the gateway at the same time The following figures describe the three COM port types to a serial device via serial network GW 7228 RS 232 Port RS 232 Device RS 232 RXD PIN9 RS 232 TXD PIN10 RS 232 GND PINI1 Figure 2 5 RS 232 Wire Connection GW 7228 RS 422 Port RS 422 Device RS 422 Rx RS 422 Rx RS 422 Tx PIN4 RS 422 Tx PINS RS 422 Rx PING RS 422 Tx RS 422 Rx PIN7 RS 422 Tx Figure 2 6 RS 422 Wire Connection GW 7228 RS 485 Port RS 485 Device RS 485 DATA PIN RS 485 D RS 485 DATA PIN2 RS 485 D Figure 2 7 RS 485 Wire Connection GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 11 2 4 Terminator Resistor Settings According to the ISO 11898 specifications the CAN Bus network must be terminated by two terminal resistors 120Q for proper operation as shown in the below figure LS LA d 1209 r OU CAN_L Figure 2 8 Terminal Resistor Therefore the GW 7228 module supplies a jumper for users to active the terminal resistor or not If users want to use this terminal resistor please open the GW 7228
8. Start Stop J1939 message sending J1939 output message register 42009 is 4 0x00 2 Make sure the Update Rate of J1939 output message table is not zero How to restore factory default 1 Power on the GW 7228 2 Change the Dip Switch position of the GW 7228 and to complete the following steps Step a in 5 seconds Step1 From Normal to Init position Step2 ee Step2 From Init to Normal E position 5 step3 be Steps From Normal to Init position F Step4 From Init to Normal Step4 Normal position 3 When the correct implementation of the above steps the J1939 Modbus LEDs of the GW 7228 should be turn on and that should be turn off after 500 ms later GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 47 4 Reset the power of the GW 7228 and the GW 7228 would back to factory defaults 6 Reconnect the GW 7228 by using the network setting as 115200 baud with none parity 1 stop bit and 1 Net ID GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011
9. addresses may be in this list GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 J1939 Device Name Device Name Device Name HEX 8 DE Device Name Components DEC Vehicle System i270 Identity Number 2097151 Vehicle System Instance 15 Manufacturer Code 2047 w Arbitraty Address Capable ECU Instance Industry Group Function Instance Global applies to all industries Function Cancel Figure 3 6 J1939 Device Name Screen The J1939 NAME is a 64 bit value that must be unique for every module on J1939 network NAME are composed of fields as shown in Table 3 4 Table 3 4 J1939 NAME Fields Arbitrary Vehicle Industry Vehicle Function ECU Manufacturer Identity Address System Reserved Function Group System Instance Instance Code Number Capable Instance 1 bit 3 bit 4 bit 7 bit 1 bit 8 bit 5 bit 3 bit 11 bit 21 bit Byte Byte Byte Byte Byte 8 Byte 7 Byte 6 Byte 5 4 3 2 1 J1939 Input Output Table The J1939 Input Output table is used define the content and format of the J1939 messages The Data from J1939 messages that are to be transmitted are mapped to the locations in the input or output table GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 26 respectively Input Table The Input table holds data that is collected from the J1939 network and can be read by the Modbus
10. master Input data points are associated with data from messages that are received on the J1939 network Output Table The Output table holds data that is written by the Modbus master and will be transmitted on the J1939 network Output data points are associated with data of messages that will be transmitted on the J1939 network Register Offset Data Length PGN Priority Address Update Rate Message Offset 0 2 61442 0 10 1 J1939 Input Table Input Register Data Length PGN Source Addr Update Rate Message Off J1939 Output Table COM Disable NetID Disable Baud Rate Disable Figure 3 7 J1939 Input Output Configuration Table GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 27 Table 3 5 J1939 Input Output Configuration Parameter Item Description Range Register Offset The offset setting into the Modbus LC Register data the offset is in bytes In the Input Table the offset is into the Modbus Al Input table Input Register Offset Byte Modbus Input Register Word 0 1 30001 LSB MSB 23 30002 LSB MSB 3070 3071 31536 LSB MSB In the Output Table the offset is into the Modbus Al Output table Modbus Output Register Word Output Register Offset Byte 0 1 40001 LSB MSB 2 3 40002 LSB MSB 3070 3071 41536 LSB MSB Data Length 0 1535 byte The amount of the d
11. s Manual Ver 1 2 May 2011 33 SPN 110 Engine Coolant Temperature Temperature of liquid found in engine cooling system Data Length 1 byte Resolution 1 deg C bit 40 deg C offset Data Range 40 to 210 deg C Operational Range same as data range Type Measured Supporting information PGN reference 65262 Figure 4 2 Example of a Suspect Parameter Number definition of SAE J1939 71 The following figure demonstrates the use of Suspect Parameter Numbers Parameter Groups and Parameter Group Numbers Parameter Group Engine Temperature EE seen CAN Data Frame SPN 110 Engine Coolant Temperature SPN 174 Fuel Temperature SPN 175 Engine Oil Temperature SPN 176 Turbocharger Oil Temperature SPN 52 Engine Intercooler Temperature SPN 1134 Engine Intercooler Thermostat Opening Figure 4 3 SPN PG and PGN structure 4 2 4 J1939 Message Transmission In the GW 7228 messages are transmitted on the J1939 network according to the J1939 output configuration table Messages are assembled from data in the output table and transmitted on a cyclic time basis Messages are transmitted automatically based on the Update Time parameter in the output data associated with the message GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 34 4 2 5 J1939 Receiving Messages Input data points are combined according to PGN and T
12. status information about the GW 7228 module that was detected 2 Modbus Configuration of Modbus network parameters 3 J1939 Configuration of J1939 network parameters 4 J1939 I O table Configuration of the contents and layout of the I O tables GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 23 Menus and Tool Bar 1 Load Configuration Load a previously saved the GW 7228 configuration file 2 Save Configuration Save the current GW 7228 configuration to a file 3 Download Parameter Download the configuration from the GW 7228 module and shown on the Utility s interface 4 Upload Parameter Upload the configuration shown on the Utility s interface to the GW 7228 module 5 Connect to GW 7228 Establish a connection with the GW 7228 6 Device Name The J1939 NAME to be used by the module in address claim messages 7 About Display the GW 7228 utility version Modbus Confiquration The Modbus configuration contains the parameters used to control the behavior of the Modbus serial interface The parameters are described as Table 3 2 All modules on the network must use the same baud parity data stop bits configuration Table 3 2 Modbus Configuration Parameters Item Description Range The ID of the module on the Modbus Net ID network All modules on the network must 1 250 have a unique address Baud Rate The network baud rate 2400 11520
13. 0 Parity The serial communication parity NONE ODD EVEN The number of data bits used in the serial Fixed at 8 Data Bits ee communication The number of stop bits used in the serial 1 2 Stop Bits bo eae communication GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 24 J1939 Configuration The J1939 network configuration parameters are described in Table 3 3 below Table 3 3 J1939 Configuration Parameters ltem Description Range Network It shows the current location of J1939 0 254 Address network To be used by the module in address claim Please see Device messages each J1939 module should have the NAME a unique NAME J1939 81 specification Auto CAN When Can Bus off the module will auto Enable Bus Off reset the CAN controller Disable Reset PDU1 Check Enable Disable to check the destination es Enable Destination address in PDU1 mode Disable Address If this option is enabled data in the I O table Swap IO would be byte swapped on 16 bit Enable Byte boundaries this function is easy reading the Disable J1939 data on Modbus network Enable or Disable auto transmission J1939 Auto Enable THANE IGSIOn output message without to control the Disable Modbus register 42009 Dec Network This is the list of possible addresses the Address module only claims a single address at a 0 253 Configuration time Up to 20
14. 3 Byte 4 5 Byte 6 7 Example Net ID Station number FC 10 Hex Reference number Word count Value for the CRC calculation In the address 40001 write the value in 0x1234 Request Command Byte0 Byte1 Byten Hex 01 10 00 00 00 01 02 12 34 AB 27 GW 7228 s response is OK Response ByteO Byte1 Byten Hex 01 10 00 00 00 01 01 C9 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 Get J1939 input data Using the Modbus command as below FC4 Read multiple input registers 3xxxx for Al Request Request by Modbus master device Byte 0 Net ID Station number Byte 1 FC 04 Byte 2 3 Reference number Byte 4 5 Word count Byte 6 7 Value for the CRC calculation Response Response from the GW 7228 Byte 0 Net ID Station number Byte 1 FC 04 Byte 2 Byte count of response B 2 x word count Byte 3 B 2 Register values Byte B 3 B 4 Value for the CRC calculation Example Read a value of one word in the address 30001 Request Byte0 Byte1 Byten Hex 01 04 00 00 00 01 31 CA GW 7228 responds a value of one word in the address 30001 Response ByteO Byte1 Byten Hex 01 04 02 12 34 B4 47 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 45 Start or Stop sending J1939 output message Using the Modbus command as below FC6 Write single register 4xxxx for AO Request Request by Modbus master devi
15. 4 Upload Parameter to the GW 3720 43 5 3 Modb s ComMU N CAO eee ata raapte era pias Erener KEER DEAE EREE ENEE DEERE 44 6 Troubleshooting ssssssssnssnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn 47 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 4 1 Introduction The GW 7228 is a solution that provides a protocol conversion between J1939 and Modbus RTU For J1939 network the GW 7228 supports PDU1 PDU2 broadcast and the destination specific type of J1939 messages From the view of Modbus RTU network the GW 7228 is a Modbus RTU slave to reply the request from Modbus RTU master We provide Utility software for users to configure the parameters of J1939 Modbus RTU of the GW 7228 The application fields can be Diesel power train applications In Vehicle networks for trucks and buses etc The following is the application architecture for the GW 7228 WinPAC 8000 Modbus RTU Control Systems Read Data RS 232 RS 422 RS 485 Write X Data Transmission Figure 1 1 Application of the GW 7228 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 5 1 1 Mode of operation The GW 7228 provides centralized data storage for data that is shared between the Modbus and J1939 networks Data is placed into the GW 7228 by one network interface and allowing the data to be read or written through the ot
16. 939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 32 Parameter Groups contain information on parameter assignments within the 8 byte CAN data field of each message as well as repetition rate and priority The following is an example of a parameter group definition as listed in SAE J1939 71 PGN 65262 Engine Temperature 1 ET1 Transmission Repetition Rate 1s Data Length 8 Extended Data Page 0 Data Page 0 PDU Format 254 PDU Specific 238 PGN Supporting Information Default Priority 6 Parameter Group Number 65262 OxFEEE Start Position Length Parameter Name SPN 1 1 byte Engine Coolant Temperature 110 2 1 byte Engine Fuel Temperature 1 174 3 4 2 bytes Engine Oil Temperature 1 175 5 6 2 bytes Engine Turbocharger Oil Temperature 176 7 1 byte Engine Intercooler Temperature 52 8 1 byte Engine Intercooler Thermostat Opening 1134 Figure 4 1 Example of a parameter group definition of SAE J1939 71 4 2 3 Suspect Parameter Number SPN A Suspect Parameter Number SPN is a number assigned by the SAE to a specific parameter within a parameter group SPN that shares common characteristics are grouped into Parameter Groups PG and they will be transmitted throughout the network using the Parameter Group Number PGN To follow up on the previous example PGN 65262 the parameter Engine Coolant Temperature is described by SPN 110 as following Figure GW 7228 J1939 Modbus RTU Slave Gateway User
17. GW 7228 J1939 Modbus RTU Slave Gateway User s Manual www icpdas com GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 1 Warranty All products manufactured by ICP DAS are under warranty regarding defective materials for a period of one year from the date of delivery to the Original purchaser Warning ICP DAS assumes no liability for damages resulting from the use of this product ICP DAS reserves the right to change this manual at any time without notice The information furnished by ICP DAS is believed to be accurate and reliable However no responsibility is assumed by ICP DAS for its use or for any infringements of patents or other rights of third parties resulting from its use Copyright Copyright 2010 by ICP DAS All rights are reserved Trademark The names used for identification only may be registered trademarks of their respective companies Document Revision Version Author Date Description of changes 1 0 T H 2010 07 26 First Release Revision 1 1 T H 2011 04 29 Modify Modbus register define Add Parameter Download 1 2 T H 2011 05 16 Function GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 2 Table of Contents Jude Hr e SE 5 1 1 Mode Of Operation EEN 6 1 2 PG AWTS GS asin ones cuca ce eegene 6 1 3 EIERE ue eebe cate cate eees 6 Hareler EE ee 8 2 1 ee Ee 8 2 2 EIERE ESEe 9 2 3
18. Hardware Elle D EE 10 2 3 1 SEENEN 10 2 3 2 Serial port CONNCCHON sde eege deed edd gedd ged ged 11 2 4 Terminator Resistor Settings visser Eeer ee See 12 2 5 Watchdog Timer Settings Ae 13 2 6 Init Normal Ree EE 13 2 6 1 Firmware Update Mode AEN 13 2 6 2 Firmware Operation MOG iici cccicoicicctcectscsiceinansliccsceciteiearsbeeageracietis 16 2 7 En tele EE 17 2 8 Cable Selection DEE 18 GE 20 3 1 Configuration Tool GW 7228 Utility 2 0 0 eee eeeeceeeeeeeeeeeeeeeeeeees 20 3 2 EU BT E 21 3 2 1 EIERE AE 21 3 2 2 Main Screen EE 23 Communication Network eeeeERERSRKSKRSEREREEEEEEEEEEEEERERERREEEEEE En 30 4 1 le lee 30 4 1 1 Supported Modbus Functions EE 30 4 1 2 Modbus Address unn 30 4 2 J1939 dE 32 4 2 1 Communication Methode 32 4 2 2 TE EE e EE 32 4 2 3 Suspect Parameter Number PN 33 4 2 4 J1939 Message Transmtseion EEN 34 4 2 5 J1939 Receiving Messages ee 35 4 2 6 Transport Protocol for Large Messages sssseeeseseernnnrneeeseeeeee 35 IAD DIICATION sic sascens cece ccs neparan aaaea daaa dappere seeebac ceceeaniueaeedd cease 36 5 1 Hardware InstalatiON EE 36 5 2 GW 7228 Utility Confouraton 40 5 2 1 Modbus Network Configuration sssssssssennneeesesesnrnrnnnesererrerren 40 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 3 5 2 2 J1939 Network Configuration c 05 cers caeceysceeeitieceiaaseeaeecesieces 40 5 2 3 J1939 I O Configuration EE 41 5 2
19. arget Address If the Target Address is configured as 255 all messages with a matching PGN will be parsed using the data point regardless of source address If the Target Address is not 255 received messages must match both the PGN and source address in order to be handled by the input data point 4 2 6 Transport Protocol for Large Messages Transmission and Reception of Large Messages Messages with buffer sizes of 8 bytes or less can be directly sent and received on J1939 However messages with buffer sizes greater than 8 bytes must be fragmented transmitted and reassembled using the J1939 transport protocol Users should reference the J1939 21 specification It provides the description of when and how the transport protocol is used by the GW 7228 GW 7228 now provides a BAM Broadcast Announce Message mechanism when messages larger than 8 bytes in length and the destination address is 255 the message will be sent or receive using transport protocol BAM GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 35 5 Application Control systems such as PAC PLC and PC on Modbus network require some data that is collected by an ECU such as engine on J1939 network There is also a part of data that is determined by the system controller and transmitted through the Modbus network for the ECU to the J1939 network PGN 61444 SPN 191 CAN Bus WinPAC 8000 Modbus RTU Control
20. ata to be transferred between the Modbus O table and the J1939 message data the length is in bytes 0 1785 byte PGN The J1939 PGN is associated with this data field In Input Table the data from messages received with this PGN will be transferred into the Input table In Output Table a message with this PGN will be built and transmitted using data from the Output table Any kinds of J1939 Parameter Group Number Priority The data is used to optimize message latency GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 28 for transmission onto the bus only the priority of any message can be set from highest 0 to lowest 7 In the output table which refers to the Destination Address this data defines the specific address to which the message is being sent If the Destination Address is set to 255 the message will be broadcast In the input table which refers to the Source 0 253 Address It shall only be one device on 255 the network with a given source address messages received must match both the PGN and source address to be used for this data field If the Source Address is 255 any message with a matching PGN will be accepted Address In the input table the data will be updated within the configured Update Rate If no update is received within the configured time the module will request the data points PGN by transmitting a Req
21. bus RTU Slave Gateway User s Manual Ver 1 2 May 2011 8 2 2 Pin Assignment Table 2 1 CAN DB9 Male Connector Pin Description 1 Not Connect CAN Low CAN Ground Not Connect CAN Ground CAN High 0O N 01 amp Po Not Connect Table 2 2 14 pin screw terminal connecter Pin Description 1 RS 485 DATA 2 RS 485 DATA 3 Not Connect 4 RS 422 Tx 5 RS 422 Tx 6 RS 422 Rx 7 RS 422 Rx 8 Not Connect 9 RS 232 RXD 10 RS 232 TXD 11 RS 232 GND 12 Not Connect 13 Vs 10 30 VDC 14 GND GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 O Sie 9 26 O 1 DODDDODDOOOPO OOD Figure 2 3 Pin Assignment on the GW 7228 2 3 Hardware Connection The GW 7228 module supports J1939 Serial Port communication it offers one CAN interface for J1939 network and three serial interfaces for Modbus network 2 3 1 CAN port connection The pin assignment of the CAN port on the GW 7228 DB9 male is defined in both the CANopen DS102 profile and in appendix C of the DeviceNet specifications It is the standard pin assignment for CAN The hardware connection between device and the GW 7228 is as Figure 2 4 CAN Device Figure 2 4 CAN Hardware Wire Connection GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 10 2 3 2
22. ce Byte 0 Net ID Station number Byte 1 FC 06 Hex Byte 2 3 Reference number Byte 4 5 Register value Byte 6 7 Value for the CRC calculation Response Response from the GW 7228 Byte 0 Net ID Station number Byte 1 FC 06 Hex Byte 2 3 Reference number Byte 4 5 Register value Byte 6 7 Value for the CRC calculation Example Start sending J1939 output message In the address 42009 write the value in 0x00 Request Command ByteO Byte1 Byten Hex 01 06 07 D8 00 00 08 85 GW 7228 responds the register value Response ByteO Byte1 Byten Hex 01 06 07 D8 00 00 08 85 Example Stop sending J1939 output message In the address 42009 write the value in 0x01 Request Command ByteO Byte1 Byten Hex 01 06 07 D8 00 01 C9 45 GW 7228 responds the register value Response ByteO Byte1 Byten Hex 01 06 07 D8 00 01 C9 45 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 46 6 Troubleshooting Item Trouble state Solution CAN Bus Transmission Fail Make sure the CAN bus wiring is 1 Power LED Blink per 100 ms connected and connected to the correct pin 2 CAN Bus Off Make sure the CAN bus wiring Power LED Blink per 500 ms does not short circuit Can t Claim Address in J1939 Please configure another J1939 3 Network network address in GW 7228 Power LED Blink per 1000 ms Utility Can not transmit the output 1 Make sure the
23. cover and use the JP3 to activate the 1200 terminal resistor built in the module as the Figure 2 9 Note that the default setting is active Figure 2 9 Terminal Resistor Jumper GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 12 Enable default Disable a E H D A A Figure 2 10 Terminal resistor JP3 Jumper Position 2 5 Watchdog Timer Settings A watchdog timer WDT is a device that performs a specific operation after a certain period of time if something goes wrong and the system does not recover on its own A watchdog timer can perform a warm boot restarting the system after a certain number of milliseconds The GW 7228 module supplies a jumper for users to active the watchdog timer or not If users want to use this WDT can open the GW 7228 cover and use the JP1 to activate the WDT built in the module as the Figure 2 9 Note that the default setting is active Enable default Disable e H H A A Figure 2 11 Watchdog timer JP1 Jumper Position 2 6 Init Normal Dip switch On the back of the GW 7228 module there is a dip switch used for firmware operation or firmware updating of the module The following steps show how to use this dip switch 2 6 1 Firmware Update Mode Please set the dip switch to the Init Initial position as Figure 2 12 and then the GW 7228 will work in the Firmware Update Mode after GW 7228 J1939 Modbus RTU Slave Gateway User
24. her network interface 1 2 Features e ROHS Design e Provide PWR J1939 MODBUS indication LEDs e The built in jumper to select 120 ohm terminal resister of CAN bus e Watchdog inside e Transmission and reception of all types of J1939 messages including PDU1 PDU2 broadcast and destination specific J1939 Transport Protocol for transmission and reception of large messages 9 1785 bytes Support BAM of Connection Management Message Network addresses management Support RS 232 RS 485 and RS 422 interfaces Support Modbus RTU slave protocol Configurable for Modbus Network ID 1 250 Configurable baud rates of 2400 4800 9600 19200 38400 57600 115200 bps Configurable for none odd or even parity and 1 or 2 stop bits e Support Function Code 03 04 06 16 of Modbus functions for reading and writing J1939 Messages 1 3 Specifications UART specs e Connector 14 pin screw terminal connector e COM1 RS 232 TXD RXD GND RS 422 Tx Tx Rx Rx RS 485 D D e Baud Rate bps 2400 4800 9600 19200 38400 57600 115200 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 6 d CAN specs CAN interface connector 9 pin D sub male CAN Baud Rate 250k Isolation Voltage 3000 VDC power protection on CAN side 2500Vrms photo couple isolation on CAN bus Terminator Resistor Selectable 1200 terminator resistor by jumper Specification ISO 11898 2 CAN 2 0A a
25. ion Controller 1 ETC1 Transmission Repetition 10 ms Data Length 8 Data Page 0 PDU Format 240 PDU Specific 2 PGN Supporting Information Default Priority 3 Parameter Group Number 61442 0xF002 Start Position Length Parameter Name SPN 1 1 2 bits Transmission Driveline Engaged 560 1 3 2 bits Torque Converter Lockup Engaged 573 1 5 2 bits Transmission Shift In Process 574 2 3 2 bytes Transmission Output Shaft Speed 191 4 1 byte Percent Clutch Slip 522 5 1 2 bits Engine Momentary Overspeed Enable 606 5 3 2 bits Progressive Shift Disable 607 6 7 2 bytes Transmission Input Shaft Speed 161 8 1 byte Source Address of Controlling Device for Transmission Control 1482 Figure 5 10 Example of a parameter group definition of SAE J1939 71 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 41 Related configuration data the following table shows the current planning Table 5 1 Configuration data of J1939 and Modbus Byte Order Byte Order Data J MODBUS Parameters PGN Length In J1939 in bytes Address H Data Field MODBUS Send Input Shaft 61442 Dec 2 5 0 40001 Speed FO02 Hex Receive Output Shaft 61442 Dec 2 1 0 30001 Speed FO02 Hex Note PGN Data Length Bytes Byte Oder in J1939 Data Field gt Transmission manufacturers provide the information required Byte Order in MODBUS gt User defined Modbus address
26. me serial communication parameters of the Modbus network configuration The Modbus network configuration screen from the GW 7228 is shown as Figure 5 8 Modbus NetID fi E Parity NONE v Stop Bis 1 x Baud Rate 115200 e Data Bits E Figure 5 8 Modbus configuration screen 5 2 2 J1939 Network Configuration The device NAME should be set according to the application and the vendor where the module is being used based on the J1939 network specification The J1939 network configuration screen from the GW 7228 is shown as Figure 5 9 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 40 J1939 Network Address Network Address Device Name 8000000000000000 Edit IR Iw CAN Bus Off Reset a afi Remove PDU1 Check Destination Address V Swap I O Bytes Remove Figure 5 9 Modbus configuration screen Enable the CAN Bus off Reset option when the CAN bus off status occurs the module will auto reset the CAN controller The Swap I O Bytes option has been enabled the data will be in the right byte orientation when accessing it via Modbus The Network Address list is set to 1 5 2 3 J1939 I O Configuration The following figure is a PGN definition about Electronic Transmission Controller when users want to receive the Transmission Output Shaft Speed from the transmission and send the Transmission Input Shaft Speed to the transmission via the GW 7228 PGN 61442 Electronic Transmiss
27. nd CAN 2 0B Module specs Dimensions 117mm x 72mm x 35mm H x W x D Operating temperature 25 to 75 C 13 to 167 F Storage temperature 40 to 80 C 40 to 176 F Humidity 5 to 95 non condensing LEDs PWRLED for power J1939 LED for J1939 communication MODBUS LED for Modbus communication Software Utility Tool Provide Modbus network configuration interface Provide J1939 network configuration interface Network Address Device Name etc Provide J1939 Input Output configuration interface Application Diesel power train applications In Vehicle networks for trucks and buses Truck Trailer connections Fleet management systems On Board Diagnostics Vehicle Automation GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 7 2 Hardware GW 7228 J1939 Modbus RTU Slave Gateway 250K bps Baud Rate of CAN Variable Baud Rate of RS 232 485 422 2400 9600 115 2K Support Modbus RTU Slave Protocol Selectable 1200 terminal resistor Statue DescrpGon On Powa OK Op Power Fated tik liver mag bid 91939 Data Tranemiedon Figure 2 1 Hardware externals of the GW 7228 2 1 Block Diagram Figure 2 2 is a block diagram illustrating the functions on the GW 7228 module It provides the 3000Vrms Isolation in the CAN interface site Block Diagram of GW 7228 3000V Isolatio Figure 2 2 Block diagram of the GW 7228 GW 7228 J1939 Mod
28. or Receive Time Out Error code 15 S D GW 7228 File Configuration About GW 7228 Status Interface J1939 Modbus RTU Slave Date Created 2010 07 22 DESCH Dese D Figure 3 4 COM Connection Successful Screen Table 3 1 GW 7228 error status Error Code Status 00 No Error 01 Can t Claim Address in J1939 Network 02 CAN Bus Off 04 CAN Bus Transmission Fail GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 22 3 2 2 Main Screen Y GW 7228 Utility vi File Configuration About GW 7228 Status Interface J1939 Modbus RTU Slave Date Created 2011 05 13 Emor 00 No Emor Fimware Version 1 30 Modbus Net ID fi 7 Parity NONE DN Stop Bits 1 EN Baud Rate 115200 DN Data Bits E J1939 Network Address Configuration Network Address 1 Device Name SFFEFFFFFFFFFFFF Edit Ada 1 Iw CAN Bus Off Reset TF Swap Auto Transmission Remove PDU1 Check Destination Address Swap I O Bytes Register Offset Data Length PGN Priority Address Update Rate Message Offset CR ees ee U U eee ee Input Register Data Length Source Addr Message Off 11939 Output Table Output Reg Data Length Priority Destinatio Message O NetID 1 Baud Rate 115200 Parity NONE Stop Bits 1 Figure 3 5 GW 7228 Utility Main Screen Display Areas 1 GW 7228 Status Display the module type and
29. ow whether the GW 7228 is transmitting receiving Modbus messages The MODBUS LED will blink whenever a Modbus message is sending or receiving GW 7228 J1939 Modbus RTU Slave ZY P e Gateway EN Figure 2 17 LED position of the GW 7228 GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 17 Table 2 3 LED indication of the GW 7228 LED Name GW 7228 Status LED Status Transmission Blink EE Bus Idle Off MODBUS Transmission Blink LED Bus Idle Off 2 8 Cable Selection The CAN bus is a balanced differential 2 wire interface running over either a Shielded Twisted Pair STP Un shielded Twisted Pair UTP or Ribbon cable The CAN L and CAN H Wire start on one end of the total CAN network that a terminator of 120 Ohm is connected between CAN L and CAN H The cable is connected from CAN node to CAN node normally without or with short T connections On the other end of the cable again a 1200 Ohm terminator resistor is connected between the CAN lines How to decide a cable type cable length and terminator depends on the baud rate in the CAN bus network please refer to the following table 2 4 CO eem E Figure 2 18 Un shielded Twisted Pair UTP GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 18 Table 2 4 Cable selection Cable Bus speed Cabletype pesistance m Terminator Bu
30. s Length a ue 1 renz 72mOnm Opm 600 1000m JE BET lt 80mOhm TEE 300 600m S ee Ge Ce lt 40mOhm 1270hm 40 300m e oe EE lt 40mOhm 124O0hm 0 40m Note The AWG means a standard method used to measure wire The numbering system works backwards from what people would think the thicker heavier the wire the lower the number For example a 24AWG wire is thicker heavier than a 26AWG wire GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 19 3 Software This chapter describes how the GW 7228 J1939 Modbus RTU Interface is configured using the configuration tool GW 7228 Utility 3 1 Configuration Tool GW 7228 Utility The GW 7228 configuration tool allows you to configure the parameters associated with the Modbus and J1939 network interfaces as well as to layout of the I O table and set up the contents GW 7228 Utility is a Microsoft Windows application that communicates with a GW 7228 over a standard RS 232 RS 422 RS 485 serial link by using the PC serial port It is compatible with Microsoft Windows 95 98 NT 2000 Vista and 7 The GW 7228 Utility can be downloaded from http ftp icodas com pub cd fieldbus_ cd J1939 gateway qw 7228 software utility GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 20 3 2 GW 7228 Utility The following is the main screens provided by GW 7228 Utility 3 2 1 Connection Screen
31. s Manual Ver 1 2 May 2011 13 reset the power of the module In this mode users can update the firmware of the GW 7228 module from computer s RS 232 port via CA 0910 cable shown as Figure 2 14 im 1m LE Init Normal Figure 2 12 Init Position of Dip Switch anejos DAA AJE GND Pin SS SABIS NLY SNGPOWWGEGLF KEREN SPIS NYD uo i CA 0910 Figure 2 14 Firmware downloads connection GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 14 Users just need to execute Firmware_Update_Tool exe and follow the below steps to complete the firmware updating process 1 Choose COM interface and COM Port 2 Click Browser button to choose firmware file e g GW7228 fw 3 Click Firmware Update button to start firmware updating process The result will show in Firmware Update field RoR a a 3 Firmware Update Click Firmware Update button to start firmware updating I d se DR 2010 4 29 F 09 20 D m di zan Gwe 5 A1 REUT Finnware Fie fw D RGA Figure 2 15 GW 7228 firmware update process The GW 7228 firmware can be downloaded from http ftp icodas com pub cd fieldbus cd J1939 gateway gw 7228 firmware The Firmware_Update_Tool program can be downloaded from http ftp icpdas com pub cd fieldbus_ cd J1939 gateway qw 7228 software tool
32. se Word addressing address the I O tables by using 16 bit words GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 30 Table 4 2 Inout Register Function Table Input Register Offset Modbus Input Register Byte Word 0 1 30001 LSB MSB 2 3 30002 LSB MSB 3070 3071 31536 LSB MSB Table 4 3 Output Register Function Table Output Register Offset Modbus Output Register Byte Word 0 1 40001 LSB MSB 2 3 40002 LSB MSB 3070 3071 41536 LSB MSB The following register address is defined to start or stop the transmission of output J1939 messages in the GW 7228 It can use the Modbus functions code 6 06 Hex and 16 10 Hex to change the register Table 4 4 Start Stop the transmission register of J1939 output message Register Description If Value 0 Start the transmission of output 42009 Dec J1939 message 7D8 Hex If Value 1 Stop the transmission of output J1939 message The following register address is defined the error status in the GW 7228 It can use the Modbus functions code 4 04 Hex to read the register Table 4 5 Registry Error Code of the GW 7228 Register Description 00 No Error 31807 Dec 01 Can t Claim Address in J1939 Network 70E Hex 02 CAN Bus Off 04 CAN Bus Transmission Fail GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 31 4 2 J1939 Network
33. uest PGN to the Source Address If the Update Rate is set to zero the Update PGN will never be requested 0 65535 Rate In the output table the associated message will be transmitted on the network with this rate If the Update Rate is set to zero the message will only be transmitted when received a request PGN for the configured PGN This is the J1939 message buffer location where data will be transferred input and output of the message buffer 0 1784 bytes Message Offset GW 7228 J1939 Modbus RTU Slave Gateway User s Manual Ver 1 2 May 2011 29 4 Communication Network 4 1 Modbus Network The GW 7228 J1939 to Modbus Interface supports the Modbus RTU serial protocol It plays a Modbus slave on the network 4 1 1 Supported Modbus Functions The Modbus function codes supported by the Modbus interface are shown as the table below Table 4 1 Supported Modbus Function Codes Function E Gode Function Name Description 3 03 Hex Reading Holding Read multiple registers 4xxxx for Register AO 4 04 Hex Reading Input Read multiple input registers 3xxxx Register for Al Preset Single ae 6 06 Hex Ragister Write single register 4xxxx for AO Preset Multiple Write multiple registers 4xxxx for TATER Registers AO 4 1 2 Modbus Address Only the areas of the Modbus UO tables that are configured with J1939 I O data are addressable Modbus functions that u
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