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User Manual
J1939 / Modbus Slave
Document code: MN67432_ENG Revision 1.100 Page 20 of 32
DEFINE J1939:
By pressing the “
Define J1939
” button near “Transmit J1939” from the main window for SW67432 (Fig. 2) the window “Define Modbus
Registers for Transmit J1939 Frames” appears (Fig. 7):
In the field “
List of Transmit J1939 Frames
” there
is the list of J1939 frames that you inserted in
“Transmit J1939” Section.
In the field “
List of Modbus Registers Relative to
the PGN Selected
” there are the Modbus words.
In the field “
Create/Modify a Modbus Register
”
you can define the index of the Modbus register and
the bytes of the J1939 frame where you write it.
With the field “
Send J1939 frame on Modbus
Write
” it is possible to decide when to send the
J1939 frame. If a Modbus word has written “False ”in
this field, the J1939 frame is not sent immediately
but it is sent when another word that have this field
“True” is written.
For example:
Click on the frame, insert the valid address in the field “Index of
Modbus Register”, select the byte position (Byte 1 in High
Modbus byte and Byte 2 in Low Modbus byte), click the “Create”
button, in the field “List of Modbus Registers” appears the new
Modbus register created.
Figure 7: “Define Modbus Registers for Transmit J1939 Frames” window
