B&B Electronics Command Response Protocol HVD100A3 Uživatelský manuál stáhnout pdf (Strana 19)

HDV100A3 Command & Response Manual 15 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

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 30 31

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B&B Electronics Command Response Protocol HVD100A3 Uživatelský manuál Strana 19