J1708

Overview

Some of our platforms feature J1708 operating over UART or SPI via a coprocessor. The supported baud rate is 9600 (faster might be possible has not yet been tested).

To be able to use the J1708 interface you will need to include /usr/lib/libj1708.so in your application.

For for a quick test you can use j1708-test.

root@mx4-ct-29009999:~# j1708-test

j1708-test
Usage: "j1708-test" l:n:p:b:m:csrqwBNR [j1708 frame]

Options:
-p,             Priority for sending (default =  8)
-m,             MID (default = 128)
-b,             Baud-rate ([9600], 19200, 115200)
-B,             Bad checksum send
-s,             Send mode. Only one mode can be active
-r,             Receive mode. Only one mode can be active
-R,             Synchronous receive mode. Only one mode can be active
-N,             Non blocking read. Mean to be used together with -R
-l,             Number of loops in send mode.
-q,             Send sequenced data
-w,             Raw data mode, user will get messages with bad CRC
-c,             Crazy send mode. A more sporadic send then -s cmd
-n,             Number of frames to receive before terminating app

Examples:

Send 10 frames with the data provided:
j1708 -s -l 10 1 2 3 4 5 6 7 8 9 10
Read
j1708 -r

MX-V

This platform uses SPI to communicate with the J1708 bus trough a coprocessor.

The compiled library is from the hm-commercial repository.

CT and CT GL

This platform uses UART to communicate with the J1708 bus via a coprocessor. The compiled library is from our mx4-commercial or mx4 repositories.

C61

No current product has populated this alternative but it could be done, and J1708 should work the same as for CT and CT GL.