B&B Electronics Command Response Protocol HVD100A3 User Manual
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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
The mask can be used to look at a group of messages:
To set the mask to filter on the J1939 priority field, the mask would be
loaded with:
(01, 06, 02, 04, E0, 00, 00, 00, 00, ED)
To set the mask to filter on the J1939 PGN field, the mask would be loaded
with:
(01, 06, 02, 04, 07, FF, F8, 00, 00, 0B)
To set mask to filter on both the priority field and the PGN field the mask
would be loaded with:
(01, 06, 02, 04, B7, FF, F8, 00, 00, BB)
Set Filter 1 to 4
Function codes 18 and 19, 28 and 29, 38 and 39, 48 and 49 are filter pairs.
These filters are set by sending the desired arbitration code to each filter, 1
to 4. The filters work with the mask function. If the mask is set to zero in a
position (don’t care) the value of the filter in that position doesn’t matter.
The filter arbitration field is set to match the aberration code of the incoming
message. A match of the filter “and” the mask will pass the message to the
PC. The X9 sets the filter On; X8 sets the filter Off, where X=1 through 4.
Important: the receiver and each filter must have a different arbitration
code. If the receiver and a filter are given the same arbitration code the
controller may become erratic. It will need to be powered-off reset to
recover from this error.
Byte
Number
Byte
Value
Function
1
01
Start of Frame
2 06
Control
bytes
3
02
ID byte = J1708 message
4
YY
Function byte (18 or 19) (28 or 29) (38 or 39) (48 or 49)
5
XX
MSB of arbitration field (J1939 priority bits)
6 XX
MSB-1
7 XX
MSB-2
8
XX
LSB of arbitration field (J1939 source address)
9
00
Number of data bytes
10 CS
Checksum
To use the HDV100A3, the filter for a particular J1939 PGN the following
procedure must be followed.
1. Turn off the “Receive” function by sending (01, 02, 02, 00, 00, 05).