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3.5
S
erial communication portS
Port1 (local bus): Modbus serial interface – connectors S1, S2.
Figure 23
Table 19
Connector J8/J9
Nr. Pin
RJ10 4-4 pin
4
3
2
1
Cable type: flat telephone cable for pin 4-4 conductor 28AWG
24
Name
1
GND1 (**)
2
Tx/Rx+
Data reception/transmission (A+)
3
Tx/Rx-
Data reception/transmission (B-)
4
+V (reserved)
Decription
-
(*) (*) Insert the RS485 line termination in the last
device on the Modbus line, see dipswitches.
(**) Connect the GND signal between Modbus
-
80999D_MHW_GFW 400-600A_07-2020_ENG
Note
devices with a line distance > 100 m.
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