Omron NT-series Programmable Terminal V022-E3-1 - Manual (Page 286)

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Appendix E
Connecting an NT600S to an RS-232C/RS-422 Converter Unit (NT-AL001)
Connecting to an RS-232C/RS-422 converter unit allows transmissions over distances greater than 15 m (maxi-
mum of 500 m).
Max. 2 m Max. 500 m
NT-AL001
Host NT600S
RS-422A RS-232C
When connecting a C200HX/HG/HE and an RS-232C/RS-422 converter unit, use
a converter unit whose lot number is 15Y5 or later. Converter units of lot numbers
previous to 15Y5 cannot be connected.

NT-AL001 RS-232C Connector Specifications (9-pin Type)
Electrical characteristics: Conform to EIA RS-232C
Signal direction: Signal input and output is relative to the NT-AL001.
Connector
Signal Name Abbreviation
Signal Direction
Connector
Pin No.
Signal Name Abbreviation
Input Output
Connector cover
Grounding or earth for safety
purposes
FG -- --
2 Send data SD (TxD)

3 Receive data RD (RxD)

4 Request to send RS (RTS)

5 Clear to send CS (CTS)

6 +5V input +5V 
9 Signal ground SG (GND) -- --