Contents hide
1 Au Group Electronics J1708 Gateway Able to 24 Signals
2 Introduction
3 Features
4 Hardware Connection
5 Optional Accessories
6 Documents / Resources
6.1 References
7 Related Posts

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Au Group Electronics J1708 Gateway Able to 24 Signals

Au-Group-Electronic-J1708-Gateway-Able-to-24-Signals-fig-1

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.

Au-Group-Electronic-J1708-Gateway-Able-to-24-Signals-fig-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

 Reference # PID: 84 PGN: 65265           SPN: 84
Description Road Speed Wheel-Based Vehicle Speed
Transmission rate 100 ms 100 ms
Data Range 0.0 to 205.2 km/h (0.0 to 127.5 mph) 0 to 250.996 km/h (0.0 to 155.96 mph)
Bit Resolution 0.805 km/h (0.5 mph) 1/256 km/h per bit, 0 offset
 

 

2

 Reference # PID: 245 PGN: 65248            SPN: 245
Description Total Vehicle Distance Total Vehicle Distance
Transmission rate 10.0 s * 100 ms
Data Range 0.0 to 691,207,984.6 km (0.0 to 429496729.5 mil) 0 to 526,385,151.9 km (327080569.41 mil)
Bit Resolution 0.161 km (0.1 mi) 0.125 km/bit, 0 offset
 

 

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

 Reference # PID: 190 PGN: 61444    SPN: 190
Description Engine Speed Engine Speed
Transmission rate 100 ms 20ms
Data Range 0.0 to 16383.75 rpm 0 to 8,031.875 rpm
Bit Resolution 0.25 rpm 0.125 rpm
 

 

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

 Reference # PID: 100 PGN: 65263    SPN: 100
Description Engine Oil Pressure Engine Oil Pressure
Transmission rate 1.0 s 0.5s
Data Range 0.0 to 879.0 kPa (0.0 to 127.5 lbf/in2) 0 to 1000 kPa
Bit Resolution 3.45 kPa (0.5 lbf/in2)) 4 kPa
 

 

7

 Reference # PID: 102 PGN: 65270    SPN: 102
Description Boost Pressure Engine Turbocharger Boost Pressure
Transmission rate 1s 0.5s
Data Range 0.0 to 219.8 kPa (0.0 to 31.875 lbf/in2) 0 to 500 kPa
Bit Resolution 0.862 kPa (0.125 lbf/in2) 2 kPa
 

 

8

 Reference # PID: 86 PGN: 65265    SPN: 86
Description Cruise Control Set Speed Cruise Control Set Speed
Transmission rate 10s 100ms
Data Range 0.0 to 205.2 km/h (0.0 to 127.5 mph) 0 to 250 km/h
Bit Resolution 0.805 km/h (0.5 mph) 1 km/h
 

 

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

 Reference # PID: 175 PGN: 65262    SPN: 175
Description Engine Oil Temperature Engine Oil Temperature 1
Transmission rate 1s 1s
Data Range –8192.00 to +8191.75 °F – 273 to 1735 deg C
Bit Resolution 0.25 °F 0.03125 deg C
 

 

 

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

 Reference # PID: 184 PGN: 65266    SPN: 184
Description Instantaneous Fuel Economy Engine Instantaneous Fuel Economy
Transmission rate 0.2s 100ms
Data Range 0.0 to 108.835 km/L (0.0 to 255.996 mpg) 0 to 125.5 km/L
Bit Resolution 1.66072 x 10–3 km/L (1/256 mpg) 1/512 km/L per bit, 0 offset
 

 

18

 Reference # PID: 185 PGN: 65266    SPN: 185
Description Average Fuel Economy Engine Average Fuel Economy
Transmission rate 10s 100ms
Data Range 108.835 km/L (0.0 to 255.996 mpg) 0 to 125.498046875 km/L
Bit Resolution 1.66072 x 10–3 km/L (1/256 mpg) 1/512 km/L
 

 

19

 Reference # PID: 187 PGN: 65264    SPN: 187
Description Power Takeoff Set Speed Power Takeoff Set Speed
Transmission rate 10s 100ms
Data Range 0.0 to 16383.75 rpm 0 to 8,031.875 rpm
Bit Resolution 0.25 rpm 0.125 rpm
 

 

20

 Reference # PID: 83 PGN: 61443    SPN: 1437
Description Road Speed Limit Status Road Speed Limit Status
Transmission rate 1s 50ms
Data Range 1=active / 0=not active 00 – Active      /  01 – Not Active
Bit Resolution Binary 4 states/2 bit, 0 offset
 

 

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

 Reference # PID: 89 PGN: 65264    SPN: 981
Description Power Takeoff Status Engine PTO Governor Accelerate Switch
Transmission rate 1s 100 ms
Data Range 1=active / 0=not active 00 – Off / 01 – On
Bit Resolution Binary 4 states/2 bit, 0 offset
 

 

23

 Reference # PID: 71 PGN: 65252    SPN: 590
Description Idle Shutdown Timer Status Engine Idle Shutdown Timer State
Transmission rate 1s 1s
Data Range 1=active / 0=not active 00 – Inactive /01 – Active
Bit Resolution Binary 4 states/2 bit, 0 offset
 

 

 

24

 Reference # PID: 121 PGN: 61440    SPN: 571
Description Engine Retarder Status Retarder Enable – Brake Assist Switch
Transmission rate 0.2 s 100 ms
Data Range 1=on / 0=off 00 Retarder – brake assist disabled /01 – enabled
Bit Resolution Binary 4 states/2 bit, 0 offset

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

  1. 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.
  2. 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:
    1. convert J1587 “Road Speed” to J1939 “wheel based road speed” and transmit PGN 65265 on J1939 / CAN
    2. convert J1587 “Total Vehicle Distance” to J1939 “Total Vehicle Distance” and transmit PGN 65248 on J1939 / CAN network.
  3. 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 commandAu-Group-Electronic-J1708-Gateway-Able-to-24-Signals-fig-3
  4. 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 4Au-Group-Electronic-J1708-Gateway-Able-to-24-Signals-fig-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

Au-Group-Electronic-J1708-Gateway-Able-to-24-Signals-fig-5 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-
Au-Group-Electronic-J1708-Gateway-Able-to-24-Signals-fig-6  

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)
AT J1939_BUS=OFF J1939 Network Status is off Broadcast every 1 second
AT J1939_SADDRESS=NOTCLAIMED Device Source Address Clamed Status – not claimed Broadcast every 1 second
AT J1939_SA=37 Device Source Address is set at 37 AT SA=249\r\n

(change device’s default SA to 249)

Documents / Resources

Au Group Electronics J1708 Gateway Able to 24 Signals [pdf] User Manual
J1708, J1939, Gateway Able to 24 Signals

References

Related Posts

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