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2.3 Wiring
It is recommended to use only one serial port interface (RS232, RS422 or RS485) of the
HRT(3)-710 module at a time. The following section describes the necessary steps to connect
one of the three COM port types to a Modbus network.
2.3.1 RS-232 Wiring
The RS-232 port of the HRT-7(3)10 has only three pins. The wiring of the RS-232 device
with the RS-232 port of the HRT-7(3)10 is shown as Figure 4.
Figure 4: RS-232 wiring diagram
2.3.2 RS-485 Wiring
The RS-485 wiring is shown as Figure 5.
Figure 5: RS-485 wiring diagram
HRT-710 / HRT-310 User Manual
Version 1.31
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