Omron Programmable Terminals NT631 Setup Manual page 269

Specifications
For an NT Link, 1:N, RS-422A/485
Item
Communications standard
Connector
Number of Units connected
Transmission distance
For a High-speed NT Link, 1:N, RS-232C
Item
Communications standard
Connector
Number of Units connected
Transmission distance
* To connect two or more PTs, NT-AL001 Adapters are required. When using an NT-AL001, the specifications
are as follows.
• RS-232C cable: Max. 2 m
• RS-422A/485 cable: Total length 500 m max.
For a High-speed NT Link, 1:N, RS-422A/485
Item
Communications standard
Connector
Number of Units connected
Transmission distance
For a Memory Link, RS-232C
Item
Communications standard
Communications settings
Connector
Number of Units connected
Transmission distance
Communications protocol
* When using NT-AL001, specification is as follows:
• RS-232C:
• RS-422A:
252
EIA RS-422A/485
Terminal block
1:1 to 8
Max. 500 m
EIA RS-232C
9-pin D-SUB connector (female) (serial port A, B)
1:1 to 8
*
Max. 15 m
EIA RS-422A/485
Terminal block (serial port B)
1:1 to 8
Max. 500 m
EIA RS-232C
Start-stop synchronization
Communications speed:
Data length:
Stop bit:
Parity:
Flow control:
Response:
9-pin D-SUB connector (female) (serial port A, B)
1:1
Max. 15 m*
Memory link
Max. 2 m
Max. total length 500 m
Specification
Specification
Specification
Specification
1200, 2400, 4800, 9600, 19200, 38400bps
7, 8 bits
1, 2 bits
None, even, odd
None, RS/CS, XON/XOFF
Presence/absence
Appendix A