Installation
2-3
© 2012 HMS Industrial Networks AB
Doc.Id. HMSI-168-25
Modbus Network Connection
The RS-485 signals for the Modbus network are connected to pins 11 and 12 of
the 15-pin D-Sub connector. The “A” signal should be connected pin 11, the “B”
to pin 12.
The A and B signal lines should be connected to the A and B connections respec-
tively on all devices on the network. The signal lines should not be swapped on
any device connection.
Note:
Some RS-485 equipment uses “+” and “-” descriptors to label the signal
lines. The “-” corresponds to “A”. The “+” corresponds to “B”.
J1939 Network Connection
The J1939 CAN lines are connected to pins 14 and 15, with the CAN shield con-
nected to pin 13 of the 15-pin D-Sub connector. CAN Low is connected to pin 14,
CAN High to pin 15.
The CAN High and Low signal lines should be connected to the CAN High and
Low connections respectively on all devices on the network. The signal lines
should not be swapped on any device connections.