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3.11
s
erial communication Ports
Port1 (local bus): Modbus serial interface – connectors S1, S2�
Figure 28
Table 24
Connector S1/S2
RJ10 4-4 pin
4
3
2
1
Cable type: flat telephone cable for pin 4-4 conductor 28AWG
80993B_MHW_GFW-Xtra_06-2018_ENG
Nr� Pin
Name
1
GND1 (**)
2
Tx/Rx+
3
Tx/Rx-
4
+V (reserved)
Description
-
Data reception/transmission (A+)
Data reception/transmission (B-)
-
Note
(*) Insert the RS485 line
termination in the last device
on the Modbus line, see dip-
switches.
(**) Connect the GND signal
between Modbus devices with
a line distance > 100 m.
23
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