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User Manual
J1939 / Modbus Slave
Document code: MN67432_ENG Revision 1.100 Page 17 of 32
RECEIVE J1939:
By pressing the “
Receive J1939
” button from the main window for SW67432 (Fig. 2) the window “Receive J1939 Frames” appears (Fig. 4).
This section is used to define the J1939 messages accepted by the converter.
The means of the fields of the table are:
In the field “
Data Page
” the data page of the J1939 messages is defined, the value is 0 or 1 (usually it is 0);
In the field “
PGN
” the PGN of the J1939 message to receive is defined (in the J1939 protocol, the PGN is an identifier);
In the field “
Source Address
” the address of the device that sends the frame is defined.
If the field “
Transport Protocol
” is checked, the frame can use transport protocol functions;
In the field “
Start Byte
” the starting byte to save on Modbus side is defined. This field is enabled only when the field “Transport
Protocol” is checked;
In the field “
Num Bytes
” the number of consecutive byte from the starting one is defined. For example, if the Start Byte is ‘20’ and
Num Bytes is ‘10’, it is possible to read the byte from 20 to 30;
If the field “
Cancel Data
” is checked, the converter, when the data is oldest of the time inserted in the “TimeOut Data”, sets “0xFF”
in the Modbus registers reserved for the PGN;
In the field “
Mnemonic
” the description for the frame is defined.
Figure 4: “Receive J1939 Frames” window
