Omron NT20S Operation Manual page 266

Specifications
[For RS-232C] (NT20S-ST128)
Item
Communication standard
Communication settings
Connector
Number of units connected
Transmission distance
EIA RS-232C
Start-stop synchronization
Baud rate: 2400/4800/9600/19200 (bps)
Data length: 7, 8 bits
Stop bit: 1, 2 bits
Parity: Even/Odd/None
Flow control:RS/CS control
XON/XOFF control
None
9-pin D-SUB female
1-to-1
Max. 15 m
Specification
Appendix A
247