‑22‑
Cable Connector
and pin
DB9 (female) 8‑pin DIN round connector
Signal level
RS232, built‑in RS232‑RS422
converter circuit
RS422
— Pin No.
Signal Pin No. Signal
Cable connection
1 — 4 TX‑
2 RXD 7 TX+
3 TXD 1 RX‑
4 — 2 RX+
5 GND 3 GND
Compatible HMI
and Port
IT5xxx HMI COM2[RS232]
IT6xxxE HMI COM2[RS232]
IT7xxxT/E HMI COM2[RS232]
Inovance H1U/H2U/H3U RS422
communication port
Mitsubishi FX1N/2N/3U/3G RS422
communication port
HMI user program
setting for use of
the cable
In the HMI user project, set the COM2 port as "RS232";
The HMI and PLC must have the same communication protocol and
data format settings.
■ Precautions on Communication Connection
1. Cable requirements: Different cables are required for the connection of different
external devices. Do not lay the communication cables together with the AC power
cables or near electrical noise sources. Do not plug/remove the communication
cables during communication.
2. To prevent communication faults, ensure that the communication cables for
connecting the RS485/RS422 device and RS232 device do not exceed 150 m and 15
m respectively.
3. In case of communication failure, the screen displays “Connection failed:
connection_1, station 1. err:10001” until the communication is established.
4. If the communication cable is long or passes through an environment with
electrical noise, use a shielded cable.
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