B&B Electronics Command Response Protocol HVD100A3 Manuale Utente Scaricare il pdf (Pagina 28)

24 HDV100A3 Command & Response Manual

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

Start of Frame

Control bytes

ID byte = J1708 message

Function byte (18 or 19) (28 or 29) (38 or 39) (48 or 49)

MSB of arbitration field (J1939 priority bits)

MSB-1

MSB-2

LSB of arbitration field (J1939 source address)

Number of data bytes

Checksum

To use the HDV100A3, the filter for a particular J1939 PGN the following

procedure must be followed.

1 2 ... 23 24 25 26 27 28 29 30 31

Nessun commento

B&B Electronics Command Response Protocol HVD100A3 Manuale Utente Pagina 28