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3.4.2.
PORT1 (local bus): Modbus serial interface - connectors J8 and J9
Port fitted as standard on all GPC family.
RS-485 Modbus RTU serial interface, J8 and J9 connectors and DIP switch for line termination.
J8/J9 connector
RJ10 4-4 plug
4
3
2
1
Notes
*) It is recommended to also connect the GND signal between Modbus devices with a line distance > 100 m.
It is recommended to insert the RS-485 line termination in the last device on the Modbus line via the appropriate DIP
switch.
3.4.3.
PORT2 (optional Fieldbus) type M: Modbus RTU / Modbus RTU - connectors S4, S5
Port only present on GPC controllers with Fieldbus option Port 2 = M.
RS-485 Modbus RTU / Modbus RTU serial interface, S4 and S5 connectors and DIP switch for line termination.
Cable connector for
S4/S5 port
RJ10 4-4 plug
4
3
2
1
NB:
*)
It is recommended to insert the RS-485 line termination in the last device on the Modbus line via the appropriate DIP
switch.
**) It is recommended to also connect the GND signal between Modbus devices with a line distance > 100 m.
Pin
Name
1
GND1 *
2
Tx/Rx+
3
Tx/Rx-
4
+V (reserved)
Pin
Name
1
GND1 **
Tx/Rx+
2
3
Tx/Rx-
+V (reserved)
4
81900A "MHW_GPC-40/600A"_03-2021_ENG_page 27
Description
Data reception/transmission (A+)
Data reception/transmission (B-)
Description
Data reception/transmission (A+)
Data reception/transmission (B-)
Cable type
Flat telephone cable for 28AWG
4-4 conductor plug
Line termination *
S5 Connector
S4 Connector
Cable type
Flat telephone cable for 28AWG
4-4 conductor plug
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