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