ICP DAS USA GW-7228 User manual

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 1
User’s Manual
www.icpdas.com
GW-7228
J1939/Modbus RTU Slave Gateway

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 2
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
1.2
T.H.
2011-05-16
Add Parameter Download
Function
1.3
Alan
2015-04-29
Embellish wire connection and
pin assignment graphs

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 3
Table of Contents
1. Introduction.......................................................................................5
1.1 Mode of operation.............................................................................. 6
1.2 Features............................................................................................. 6
1.3 Specifications..................................................................................... 6
2. Hardware ...........................................................................................8
2.1 Block Diagram.................................................................................... 8
2.2 Pin Assignment.................................................................................. 9
2.3 Hardware Connection ...................................................................... 10
2.3.1 CAN port connection...................................................................... 10
2.3.2 Serial port connection......................................................................11
2.4 Terminator Resistor Settings............................................................ 12
2.5 Watchdog Timer Settings................................................................. 13
2.6 Init / Normal Dip-switch.................................................................... 13
2.6.1 Firmware Update Mode.................................................................. 13
2.6.2 Firmware Operation Mode.............................................................. 16
2.7 LED Indication.................................................................................. 17
2.8 Cable Selection................................................................................ 18
3. Software...........................................................................................20
3.1 Configuration Tool –GW-7228 Utility............................................... 20
3.2 GW-7228 Utility................................................................................ 21
3.2.1 Connection Screen......................................................................... 21
3.2.2 Main Screen................................................................................... 23
4. Communication Network................................................................30
4.1 Modbus Network.............................................................................. 30
4.1.1 Supported Modbus Functions ........................................................ 30
4.1.2 Modbus Address ............................................................................ 30
4.2 J1939 Network................................................................................. 32
4.2.1 Communication Methods................................................................ 32
4.2.2 Parameter Groups.......................................................................... 32
4.2.3 Suspect Parameter Number (SPN)................................................ 33
4.2.4 J1939 Message Transmission........................................................ 34
4.2.5 J1939 Receiving Messages ........................................................... 35
4.2.6 Transport Protocol for Large Messages ......................................... 35
5. Application ......................................................................................36
5.1 Hardware Installation ....................................................................... 36
5.2 GW-7228 Utility Configuration.......................................................... 40
5.2.1 Modbus Network Configuration...................................................... 40

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 4
5.2.2 J1939 Network Configuration......................................................... 40
5.2.3 J1939 I/O Configuration ................................................................. 41
5.2.4 Upload Parameter to the GW-7228................................................ 43
5.3 Modbus Communication .................................................................. 44
6. Troubleshooting..............................................................................47

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 5
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 :
Figure 1-1:Application of the GW-7228

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 6
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 other network interface.
1.2 Features
RoHS Design
Provide PWR / J1939 / MODBUS indication LEDs
The built-in jumper to select 120 ohm terminal resister of CAN bus
Watchdog inside
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.
Support Function Code 03 / 04 / 06 / 16 of Modbus functions for
reading and writing J1939 Messages.
1.3 Specifications
[ UART specs: ]
Connector : 14-pin screw terminal connector
COM1 : RS-232(TXD, RXD, GND)
RS-422(Tx+, Tx-, Rx+, Rx-)
RS-485(D+, D-)
Baud Rate (bps) : 2400, 4800, 9600, 19200, 38400, 57600, 115200

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 7
[ 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 120Ω terminator resistor by jumper
Specification; ISO-11898-2, CAN 2.0A and CAN 2.0B
[ Module specs: ]
Dimensions :117mm x 72mm x 35mm (H x W x D)
Operating temperature :-25 to 75ºC (-13 to 167ºF)
Storage temperature :-40 to 80ºC (-40 to 176ºF)
Humidity :5 to 95%, non-condensing
LEDs :PWR LED 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 1.3, Apr/2011) ------------- 8
2. Hardware
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.
Figure 2-2:Block diagram of the GW-7228

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 9
2.2 Pin Assignment
Table 2-1:CAN DB9 Male Connector
Pin
Description
1
Not Connect
2
CAN Low
3
CAN Ground
4
Not Connect
5
6
CAN Ground
7
CAN High
8
Not Connect
9
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 1.3, Apr/2011) ------------- 10
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.
Figure 2-4:CAN Hardware Wire Connection

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 11
2.3.2 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
terminalconnector 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.
Figure 2-5:RS-232 Wire Connection
Figure 2-6:RS-422 Wire Connection
Figure 2-7:RS-485 Wire Connection

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 12
2.4 Terminator Resistor Settings
According to the ISO 11898 specifications, the CAN Bus network
must be terminated by two terminal resistors (120Ω) for proper operation,
as shown in the below figure.
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 cover and use the JP3 to activate the 120Ω
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 1.3, Apr/2011) ------------- 13
Enable (default) Disable
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
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’s Manual (Ver 1.3, Apr/2011) ------------- 14
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.
Figure 2-12:Init Position of Dip-Switch
Figure 2-13:CA-0910 Cable
Figure 2-14:Firmware downloads connection

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 15
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.
Figure 2-15:GW-7228 firmware update process
The GW-7228 firmware can be downloaded from
http://ftp.icpdas.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/gw-
7228/software/tool.
1
2
3
4
6
5

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 16
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.
Figure 2-16:Normal Position of Dip-Switch

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 17
2.7 LED 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 show whether the GW-7228 is transmitting/receiving
Modbus messages. The MODBUS LED will blink whenever a Modbus
message is sending or receiving.
Figure 2-17:LED position of the GW-7228

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 18
Table 2-3:LED indication of the GW-7228
LED Name
GW-7228 Status
LED Status
ALL LEDs
Firmware Updating Mode
All LED always turned on
Hardware WDT Fail
All LED blink per 1 second
Contact to ICP DAS
All LED blink per 100 ms
PWR LED
No Error
Always turned on
CAN Bus Transmission Fail
Blink per 100 ms
CAN Bus-Off
Blink per 500 ms
Can’t Claim Address in
J1939 Network
Blink per 1000 ms
Power Failure
Off
J1939 LED
Transmission
Blink
Bus Idle
Off
MODBUS
LED
Transmission
Blink
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 120Ω(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.
Figure 2-18:Un-shielded Twisted Pair (UTP)

GW-7228 J1939/Modbus RTU Slave Gateway User’s Manual (Ver 1.3, Apr/2011) ------------- 19
Table 2-4:Cable selection
Bus speed
Cable type
Cable
Resistance/m
Terminator
Bus Length
50k bit/s
at 1000m
0.75~0.8mm2
18AWG
70 mOhm
150~300
Ohm
600~1000m
100k bit/s
at 500m
0.5~0.6 mm2
20AWG
< 60 mOhm
150~300
Ohm
300~600m
500k bit/s
at 100m
0.34~0.6mm2
22AWG, 20AWG
< 40 mOhm
127 Ohm
40~300m
1000k bit/s
at 40m
0.25~0.34mm2
23AWG, 22AWG
< 40 mOhm
124 Ohm
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 1.3, Apr/2011) ------------- 20
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.icpdas.com/pub/cd/fieldbus_cd/J1939/gateway/gw-
7228/software/utility.