Omron NT31 NT31C manual Usable Communication, Connection via a convertor unit, 1N connection

Method for Connection to the Host

Section 2-1

Usable Communication

Communica-

Communica-

Method

tion Type at

tion Type at

Usable Connection Method

Details

Host

NT

NT

PT

Host

Link

Link

Memory

link

link

(1:1)

(1:N)

1:1 connection via a convertor unit

PT

Convertor unit

Host

(NT-AL001)

f

88

RS-485

RS-232C

(max. 500 m)

(max. 2 m)

RS-232C

1:N connection via a convertor unit

PT

Convertor unit

Host

(NT-AL001)

f

92

RS-485

RS232C

(total length 500 m)

(max. 2 m)

RS-485

Direct 1:1 connection

PT

Host

f

121

RS-485 (max. 500 m)

1:N connection

RS-485

PT

Host

RS-485 (total length 500 m)

f

125

f: Connection possible : Connection not possible

•The RS-232C/RS-422A convertor unit (NT-AL001) requires +5 V, 150 mA at pin 6 of the RS-232C connector. Check the signals of the RS-232C connector at the host.

•+5 V is not output from serial port B of the NT31/NT31C. When connecting an NT-AL001 at serial port B, a separate power supply is required for the NT- AL001.

•The cable of an NT-AL001 cannot be connected or disconnected while the power is ON. Always connect or disconnect the cable while the power supply from the RS-232C cable is OFF (while the host power supply is OFF).

•NT link (1:N) connection is possible even when RS-232C is used at the NT31/NT31C side for communication with the host, but in this case one NT- AL001 unit is required for each NT31/NT31C. In this case, it is convenient to use serial port A of the NT31/NT31C. +5 V is not output from serial port B.

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