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3 Wiring
H2U-232-CAB (Order No.: 15042148)
Cable connector and
pin
DB9 female
8-pin DIN round port
Signal level
RS232, wiht built in RS232
-RS422 transfer circuit
RS422
Internal connection
between the cables
Pin No. Signal Pin No. Signal
1 4 TX-
2 RXD 7 TX+
3 TXD 1 RX-
4 2 RX+
5 GND 3 GND
Model and port using
the cable
IT5*** HMI COM2[RS232]
IT6***E HMI COM2[RS232]
Inovance H1U/H2U/H3U
RS422 communication port
Mitsubishi FX1N/2N/3U/3G
RS422 communication port
HMI user program
setting when using this
cable
•
Set COM2 to RS232.
•
Select the same communication protocol and data
format for the HMI and the PLC.
3.2.4 Precautions on Communication Connection
Cable requirements: Use different cables for connection of different external
devices. Do not lay the communication cable together with the AC power cables
or near sources of electrical noise. Do not plug/remove the communication cable
during communication.
To avoid communication problems, ensure:
Communication cable ≤ 150 m when connecting RS485/422 devices
Communication cable ≤ 15 m when connecting RS232 devices
If a communication problem exists, “Out time” will display on the screen and
disappears only after the communication becomes normal.
Use a shielded cable as the communication cable if the cable is too long or needs to
run through the electrical noise environment.
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