User Guide

16 HDV100A3 Command & Response Manual-1306cr
B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350
PH [phone] -- FAX [phone]
J1708 Message Filter
The J1708 message filter will operate on 4 different MID’s. Only messages
with the same MID as set in the filter will be sent to the PC. The filters will
be OR’ed together so that multiple MID’s can be filtered, MID1 or MID2 or
MID3. The format for the setting of J1708 filtering is as follows:
Set Filter Active
Byte
Number
Byte
Value
Function
1 01 Start of frame
2 03 Control bytes
3 01 ID byte 1 = J1708 message
4 X9 Set filter 9 = Set filter active X = filter number 1 to 4
5 XX Value of MID to filter On
6 00 Data bytes
7 CS Checksum
Set Filter Off
Byte
Number
Byte
Value
Function
1 01 Start of frame
2 02 Control bytes
3 01 ID byte 1 = J1708 message
4 X8 Set filter 8 = Set filter inactive X = filter number 1 to 4
6 00 Data bytes
7 CS Checksum
Setting all filters off will stop all data from the J1708 bus. When all filters
are set off you must send the receive J1708 command to start receiving all
bus messages.