Omron NT20S Operation Manual page 83

Host Connections by RS-232C
Connecting to the Host Computer
Caution:
64
Connector Connector
pin #
2
3
4
5
6
9

Unlisted pins are not used.
Note: For cable parts and the wiring method, refer to APPENDIX G Method for Making
the Cable for Connection to the Host (page 256).
Use a cable that is compatible with the RS-232C connector of the host to connect
the NT20S and the host (see the example in the figure below).
In the example shown here, the cable connects the 9-pin connector of the NT20S
and 25-pin connector of the host. If the host has a 9-pin RS-232C connector, use
an RS-232C cable with 9-pin connectors at both ends.
NT20S
9-pin connector
S When making the connection, switch off the power to the NT20S and PC before
disconnecting or connecting any connector.
S After connecting the communication cable, always secure it with the screws.
Otherwise the cable may disconnect, causing operation to fail.
Note: If using the +5 V supply of pin No.6, check first that the equipment that is to receive
the supply has a current capacity no greater than 150 mA. The +5 V output of the
NT20S is +5 V DC "5%, max. 150 mA.
Signal name Signal name
Send data
Receive data
Request to send
Clear to send
+5 V output, max. 150 mA
Signal ground
Host Interface connector
(RS-232C, 9-pin type)
RS-232C cable
Section 2-8
Signal direction
Abbreviation Abbreviation
NT20S ← → Host
SD (TXD)
RD (RXD)
RS (RTS)
CS (CTS)
+5V
SG (GND)
25-pin connector
→
←
→
←
→
—