Omron Programmable Terminals NT31 NT31C - Manual (Page 262)

Appendix A Specifications
252
For an NT Link , 1:1, RS-422A Type
Item Specification
Communications standard EIA RS-422A
Connector 25-pin D-SUB connector (female) (serial port B)
Number of units connected 1:1
Transmission distance Max. 500 m
For an NT Link , 1:N, RS-232C Type
Item Specification
Communications standard EIA RS-232C
Connector
9-pin D-SUB connector (female) (serial port A)
25-pin D-SUB connector (female) (serial port B)
Number of units connected 1:1 to 8
Transmission distance Max. 15 m *
* To connect two or more PTs, NT-AL001 units 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 an NT Link , 1:N, RS-422A/485 Type
Item Specification
Communications standard EIA RS-422A/485
Connector 25-pin D-SUB connector (female) (serial port B)
Number of units connected 1:1 to 8
Transmission distance Max. 500 m
For a High-speed NT Link , 1:N, RS-232C Type
Item Specification
Communications standard EIA RS-232C
Connector
9-pin D-SUB connector (female) (serial port A)
25-pin D-SUB connector (female) (serial port B)
Number of units connected 1:1 to 8
Transmission distance Max. 15 m *
* To connect two or more PTs, NT-AL001 units 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 Type
Item Specification
Communications standard EIA RS-422A/485
Connector 25-pin D-SUB connector (female) (serial port B)
Number of units connected 1:1 to 8
Transmission distance Max. 500 m