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3. Emerson EC20 series PLC COM1（RS485）:
EMERSON-EC20 series CPU
OP COM1 RS485
9-pin D-type female port 5-wire terminal
（Diagram 3— fit for OP320-S, OP320-A-S, OP325-S, OP33-S）
Note: Emerson EC20 series PLC COM1 has RS232 and RS485. Only one of them can be used at
the same time. Do not connect unused com to avoid interference.
3-15．IDEC Micro Smart series PLC
1. IDEC CPU（Micro3 series）RS485:
Idec PLC Micro3 CPU
OP RS485 programming port
9-pin D-type female port 8-pin round male port
（fit for OP320-A-S, OP320-S, OP330-S, OP325-S）
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