Omron NT20S Operation Manual page 281

Method for Making the Cable for Connection to the Host
Connecting an NT20S to an RS-232C/422A Converter Unit (NT-AL001)
Connecting an RS-232C/422A converter unit enables the transmission distance to be made greater than 15 m (up
to 500 m).
Reference: When connecting the C200HX/HG/HE and an RS-232C/RS-422A converter unit, use a converter unit
whose lot number is 15Y5 or later. Converter units of lot numbers previous to 15Y5 cannot be con-
nected.
NT-AL001 RS-232C connector specifications (9-pin type)
Electrical characteristics: Comply with EIA RS-232C
Signal direction:
1
5
NT-AL001 RS-422A terminal block specifications
Connected terminal block: RS-422A terminal block (M3 screws)
Electrical characteristics: Comply with EIA RS-422A
Signal direction:
8
7
6
5
4
3
2
1
262
NT20S
RS-232C
Max. 2 m
Signal input and output is relative to the NT-AL001
6
Connector Connector
Pin No.
Connector cover
2
3
4
5
9
6
9
Signal input and output direction is relative to the NT-AL001
Terminal No Terminal No.
1
2
3
4
5
6
7
8
NT-AL001
RS-422A
Max. 500 m
Signal Name Signal Name
Frame ground
Send data
Receive data
Request to send
Clear to send
+5 V input
Signal ground
Signal Name Signal Name
Frame ground
Signal ground
Send data (+)
Send data (–)
Receive data (+)
Receive data (–)
Request to send (+)
Request to send (–)
Appendix G
Host
Signal Direction
Abbreviation Abbreviation
Input
FG –
SD (TXD)
f
RD (RXD)
RS (RTS)
f
CS (CTS)
f
+5V
SG (GND) –
Signal Direction
Abbreviation Abbreviation
Input
FG –
SG –
SDB
SDA
f
RDB
f
RDA
CSB
CSA
Output
–
f
f
–
Output
–
–
f
f
f
f