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C. Modbus RTU/RS485, CANopen Interface
Connector S4
RJ10 4-4 Pin Pin Name Description Note
1 GND1 (**) -
(**) Connect the GND signal
among Modbus devices with a
line distance > 300 ft. (100 m)
2 Rx/Tx+ Data reception/transmission (A+)
3 Rx/Tx- Data reception/transmission (B-)
4 +V Reserved -
Cable Type: Flat telephone cable for pin 4-4 conductor 28 AWG
Connector S5
D-Sub 9 Pins
Female Pin Name Description Note
1 - Reserved Connect the terminal resis-
tances as shown in the figure.
2 CAN_L CAN_L bus line (domination low)
3 CAN_GND CAN Ground
4 - Reserved
5 (CAN_SHLD) Optional CAN Shield
6 (GND) Optional Ground
7 CAN_H
CAN_H bus line (domination High)
8 - Reserved
9 (CAN_V+)
Optional CAN external positive sup-
ply (dedicated for supply of trans-
ceiver and optocouplers, if galvanic
isolation of the bus node applies)
Cable Type: Shielded 2 pairs 22/24 AWG conforming to CANopen.
S5 Male DB9 Connector
S4 Fema
Red LED
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