Set filter active – B&B Electronics HDV100A3 - Manual User Manual

Page 19

HDV100A3 Command & Response Manual

Cover Page

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5104

After sending a transmit message to the HDV100A3 you will get the

confirmation message if the checksum is correct. A transmit complete
message is sent to the PC after the device successfully transmits the message
to the J1708 bus. A second message should not be sent to the device before
confirming that the first message has been sent. The transmit confirmation is
formatted as follows:

Byte Number

Byte Value
(hex)

Byte Function

Start of frame

Number of control bytes

ID bytes 9 = transmit OK

Number of data bytes

Checksum

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

Start of frame

Control bytes

ID byte 1 = J1708 message

Set filter 9 = Set filter active X = filter number 1 to 4

Value of MID to filter On

Data bytes

Checksum