B&B Electronics HVD100A3 Benutzerhandbuch

HDV100A3 Command & Response Manual-1306cr

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

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

Transmit Data to J1939 Bus

Byte
Number

Byte
Value

Function

Start of frame

2 06

Control

bytes

ID byte 1 = J1708 message

Function byte 02 transmit message

MSB of arbitration field (J1939 priority bits)

6 XX

MSB-1

7 XX

MSB-2

LSB of arbitration field (J1939 source address)

Number of data bytes

DATA

From 0 to 8 bytes

Checksum

Set Mask

Function code 04 set mask. The mask is applied to ALL filters. The mask is
32 bits long. The last 3 bits are not used and must be set to zero. This mask
covers the 29-bit arbitration field. To use the filter function, the mask must
be set. The mask determines what position(s) will be tested and matched to
the incoming message. If a 1 is set in a particular position, that position will
be tested. It will be “and” with any active filters to determine if the message
will be passed to the PC side. Any position marked with a 0 is a “don’t care”
position and will pass all data in that position. There is a form on page 33
that helps set up the mask for the arbitration field.