Omron NT620S Operation Manual page 295

Specifications
* When NT-AL001 used
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Item
Communications standard
Communication settings
Connector
Number of units connected
Transmission distance
* An RS232C/RS422 converter unit is required.
286
EIA RS-232C
Start-stop synchronization
Baud rate : 2400, 4800, 9600, 19200 bps
Data length : 7, 8 bits
Stop bit : 1, 2 bits
Parity : None, even, odd
Flow control : None, RS/CS, XON/XOFF
(RS-CS can only be selected with RS-232C.)
9-pin D-SUB connector (female)
1:1
Max. 15 m
Specification
RS-422A*
9-pin D-SUB connector (female)
(NT620S/NT620C)
RS-232C cable: Max. 15 m
RS-422A cable: Total length 500 m
Appendix A