Omron NT31 Operation Manuals page 661

Specifications
S For a Memory Link (RS-422A Type)
Item
Communications standard
Communications settings
Connector
Number of units connected
Transmission distance
Communications protocol
S For a Bar Code Reader
Item
Communications standard
Communications settings
Connector
Number of units connected
Transmission distance
Communications protocol
Data format
650
EIA RS-422A
Start-stop synchronization
Communications speed:
Data length:
Stop bit:
Parity:
Flow control:
Response:
25-pin D-SUB connector (female) (serial port B)
1:1
Max. 500 m*
Memory link
EIA RS-232C
Start-stop synchronization
Communications speed:
Data length:
Stop bit:
Parity:
Flow control:
9-pin D-SUB connector (female) (serial port A)
1:1
Max. 15 m
Non-protocol mode
[STX] Data (0 to 40 bytes)
Specification
1200, 2400, 4800, 9600, 19200, 38400bps
7, 8 bits
1, 2 bits
None, even, odd
None, XON/XOFF
Presence/absence
Specification
4,800, 9600, 19200 bps
7, 8 bits
1, 2 bits
None, even, odd
RS/CS
[ETX]
APPENDIX A