Au Group Electronics J1708 Gateway Able to 24 Signals User Manual

: June 5, 2024
: Au Group Electronics

Table of Contents

Au Group Electronics J1708 Gateway Able to 24 Signals
Introduction
Features
Hardware Connection
Optional Accessories
References
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Au Group Electronics J1708 Gateway Able to 24 Signals

Introduction

Au SAE J1708 to J1939 gateway (GW2) is able to 24 signals from SAE J1708/1587 network to J1939 network. It is designed for trucks with SAE J1708/J1587 network only. It will add a J1939 network to those trucks.

Features

Power Supply: +12V – + 24V DC, 65mA typical, 250mA max
Operating Temperature: -40˚F to 185˚F (-40˚C to 85˚C)
TVS (Transient Voltage Suppressor) protection on J1939
Size: 3-1/8”L X 1-11/16”W X 13/16” H (78mm X 42mm X 21mm)
1 LED (Bus Communication)
1 RS232 interface (DB9 female connector): can be connected to PC or any device with RS232 serial port for device running status monitoring and in-field programming ( default RS232 baud rate: 115.2K).
1 BUS interface (DB9 male connector): can be connected to J1939/CAN, J1708/J1587 network, and a power supply (+14.2V DC nominal). The pin-out of the DB9 male “BUS” interface is illustrated in Figure 2.

Factory Reprogrammable Default Settings

	MID on J1708 / J1587 network	SA on J1939 network
GW2 device (Off Board Diagnostic Service Tool 1)	172	249
GW2 device shipped after June 9, 2017	164 (multiplexer)	37 (Off Vehicle

Gateway)

MID for Relevant PID (to be received by GW2)

PID	MID (with priority from high to low)
84 (0X54) – Road Speed	136, 128, all other MID
245 (0XF5) – Total Vehicle Distance	128, all other MID
247 (0XF7) – Total Engine Hours	128, all other MID

Supported Parameters Cross Reference

Parameters	SAE J1708 / J1587	SAE J1939

1

2

3

| Reference #| PID: 247| PGN: 65253 SPN: 247
---|---|---|---
Description| Total Engine Hours| Engine Hour
Transmission rate| On request *| On request
Data Range| 0.0 to 214,748,364.8 hr| 0 to 210,554,060.75 hr
Bit Resolution| 0.05 h| 0.05 hr/bit, 0 offset

4

5

| Reference #| PID: 110| PGN: 65262 SPN: 110
Description| Engine Coolant Temperature| Engine Coolant Temperature
Transmission rate| 1.0 s| 1s
Data Range| 0.0 to 255.0 °F| – 40 to 210 ° C
Bit Resolution| 1.0 °F| 1.0 °C

6

7

8

9

| Reference #| PID: 91| PGN: 61443 SPN: 91
Description| Percent Accelerator Pedal Position| Accelerator Pedal Position 1
Transmission rate| 0.1s| 100ms
Data Range| 0.0 to 102.0%| 0 to 100 %
Bit Resolution| 0.40%| 0.40%

10

| Reference #| PID: 92| PGN: 61443 SPN: 92
Description| Percent Engine Load| Engine Percent Load At Current Speed
Transmission rate| 0.1s| 50ms
Data Range| 0.0 to 127.5%| 0 to 250 %
Bit Resolution| 0.50%| 1%

11

| Reference #| PID: 105| PGN: 65270 SPN: 105
Description| Intake Manifold Temperature| Engine Intake Manifold 1 Temperature
Transmission rate| 1s| 0.5s
Data Range| 0.0 to 255.0 °F| – 40 to 210° C
Bit Resolution| 1.0 °F| 1 ° C

12

| Reference #| PID: 108| PGN: 65269 SPN: 108
---|---|---|---
Description| Barometric Pressure| Barometric Pressure
Transmission rate| 1s| 1s
Data Range| 0.0 to 109.9 kPa (0.0 to 15.9375 lbf/in2)| 0 to 125 kPa
Bit Resolution| 0.431 kPa (0.0625 lbf/in2)| 0.5 kPa

13

| Reference #| PID: 168| PGN: 65271 SPN: 168
Description| Battery Potential(Voltage))| Battery Potential / Power Input 1
Transmission rate| 1s| 1s
Data Range| 0.0 to 3276.75 V| 0 to 3212.75 V
Bit Resolution| 0.05 V| 0.05 V

14

| Reference #| PID: 174| PGN: 65262 SPN: 174
Description| Fuel Temperature| Engine Fuel Temperature
Transmission rate| 1s| 1s
Data Range| –8192.00 to +8191.75 °F| – 40 to 210 ° C
Bit Resolution| 0.25 °F| 1 ° C

15

16

| Reference #| PID: 183| PGN: 65266 SPN: 183
Description| Fuel Rate (Instantaneous)| Engine Fuel Rate
Transmission rate| 0.2s| 100ms

Data Range

| 0.0 to 1.07665 L/s

(0.0 to 0.28442190 gal/s or 0.0 to 1023.98 gal/h)

|

0 to 3,212.75 L/h

Bit Resolution| 16.428 x 10–6 L/s (4.34 x 10–6 gal/s or 1/64 gal/h)| 0.05 L/h

17

18

19

20

21

| Reference #| PID: 85| PGN: 65265 SPN: 595
---|---|---|---
Description| Cruise Control Status| Cruise Control Status
Transmission rate| 0.2s| 100ms
Data Range| 1=active /0=not active| 00 – Cruise control switched off /01 – on
Bit Resolution| Binary|

22

23

24

Per SAE J1708 definition, Total Vehicle Distance (PID: 245) on J1708 network is broadcasted every 10 seconds, however, per SAE J1939 definition, transmission rate for Total Vehicle Distance on J1939 network is 100 milliseconds, so every time after GW2-1708-1939 device is powered up, there will be a period up to 10 seconds the “Total Vehicle Distance ” on J1939 network will displays as 0xFF FF FF FF (255 255 255 255) as there are no “Total Vehicle Distance” data available from J1708 network during at that time frame.

Timestam p (ms)| P| R| DP| Srr| exid| PF| PS| SA| PGN| DLC| data1| data2| data3| data4| data5| data6| data7| data8
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
70627| 6| 0| 0| 0| 1| 254| 224| 37| 65248| 8| 255| 255| 255| 255| 255| 255| 255| 255
…| 6| 0| 0| 0| 1| 254| 224| 37| 65248| 8| 255| 255| 255| 255| 255| 255| 255| 255
80478| 6| 0| 0| 0| 1| 254| 224| 37| 65248| 8| 255| 255| 255| 255| 21| 83| 98| 0

Hardware Connection

Following is an example of how GW2 (Au J1708 to J1939 gateway) was used in the lab environment, Au J1939 Data center captured the PGN 65265, 65248, 65253 on J1939 / CAN network, the result is displayed on Au J1939 Data Center PC optional PC was used for demonstration purpose (Figure 3). Two 120-ohm terminal resistor must present on each end of the J1939 network backbone.
On Figure 3, the J1708 ECU broadcasts “road speed” and “total vehicle distance” signals on J1708 network. Au GW2 receive these two parameters (road speed, odometer signals) on J1708 network . Then it will perform the following:
convert J1587 “Road Speed” to J1939 “wheel based road speed” and transmit PGN 65265 on J1939 / CAN
convert J1587 “Total Vehicle Distance” to J1939 “Total Vehicle Distance” and transmit PGN 65248 on J1939 / CAN network.
In the mean time, it also output ASCII string on RS232, which can be displayed on PC screen using Tera Term (open source serial communication software) for monitoring purpose, please see details at the next paragraph for AT command
On Figure 3, A J1939 device (Au J1939 Interpreter) was used to send out Engine Hour request command to J1939 network (using PGN 59904), once GW2 receive the request, it will send the request to J1708 ECU, then J1708 ECU will reply with the current Total Engine Hours and send it over to J1708 network (PID 247). GW2 then convert Total Engine Hour to SAE J1939 Engine Hour and transmit SPN 247 (PGN 65243) on J1939 / CAN network. Engine Hour data flow is illustrated in Figure 4

Optional Accessories

On the Bus side, use CBL-CAN-485-01 or CBL-CAN-485-03 to connect Au J1708 to J1939 Gateway to power supply, J1708 network, and J1939 network: connect black wire to GND, red wire to +12V/24V DC Power Supply , Yellow wire to CAN-L, Green wire to CAN-H), Brown wire to J1708 B -, Violet wire to- J1708 A

| CBL-CAN-485-01: A 6-wire color coded cable which can be used for Au J1939 devices, Au J1708 devices. One end of the cable is DB9 female connector; it is designed to mate with Au devices on BUS side.

The other side of the cable is a pig tail with 3 pairs of twisted color coded wires: Red wire: Power supply, e.g. +12V DC Black wire: Ground

Yellow wire: CAN High Green wire: CAN Low

Violet: J1708A+ Brown: J1708B-

---|---
|

CBL-CAN-485- 03

CBL-CAN-485-03 is a 0.33 meter CAN/J1939/J1708 cable with DB9 female connector and 9-way round threaded plug (HD16-9-1939S).

This cable can be used to connect Au J1939 / J1708 products to trucks and school buses equipped with 9 pin diagnostic connectors.

AT Command	Description
AT J1708_BUS=ON	J1708 Network is ON
AT J1708_MID=164	Device MID is setting at 164
AT J1939_BUS=ON	J1939 Network is ON
AT J1939_SADDRESS=CLAIMED	Device Source Address Clamed Status – Claimed
AT J1939_SA=37	Device Source Address is setting at 37
AT ROAD_SPEED=126.5MPH	Road Speed is 126.5 mile per hour
AT HR=950049.0HR	Engine Hour is 950049.0 hours
AT TVD_ODO=950050.0MILE	Total vehicle distance is 950050.0 mile
AT DV=14.239V	Device voltage is 14.239 volts

AT Command

AT Command| Description| Command to request information or change default setting
---|---|---
AT ID=GW2-1708-1939-001| Device ID is:

GW2-1708-1939-001

| display once at power up, can be requested using: AT ID=?\r\n
AT FW=0.1B(32K-BUILD06172017-01)| Device Firmware| display once at power up, can be requested using: AT FW=?\r\n
AT SN=1612| Device Serial Number| display once at power up, can be requested using: AT SN=?\r\n
AT DV=14.677V| Device Voltage| Broadcast every 1 second
AT J1708_BUS=OFF| J1708 Network Status is off| Broadcast every 1 second
AT J1708_MID=164| Device Message ID – Default setting at 164 (Multiplex)| AT MID=165\r\n

(change device default MID to 165)

(change device’s default SA to 249)