Omron NT20S-ST121B-EV3 User Manual page 101

Host Connections by RS-232C (NT20-ST128)
Note
Connecting to the Host
Computer
!Caution When making the connection, turn OFF the power to the NT20 and PLC
!Caution After connecting the communications cable, always secure it with the screws.
Note
80
Connector Signal name
pin #
6 +5 V output, 150 mA
max.
9 Signal ground
Note Unlisted pins are not used.
For cable parts and the wiring method, refer to Appendix C Transporting and
Storing PTs on page 263.
Use a cable that is compatible with the RS-232C connector of the host to con-
nect the NT20 and the host (see the example in the figure below).
In the example shown here, the cable connects the 9-pin connector of the
NT20 and 25-pin connector of the host. If the host has a 9-pin RS-232C con-
nector, use an RS-232C cable with 9-pin connectors at both ends.
NT20
9-pin connector
before disconnecting or connecting any connector.
Otherwise the cable may disconnect, causing operation to fail.
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 NT20 is +5 V DC ± 5%, 150 mA max.
Do not use both port's +5 V output at the same time.
Abbreviation
+5 V
SG (GND)
Host Interface connector
(RS-232C, 9-pin type)
RS-232C cable
Section 2-8
Signal direction
NT20 ← → Host
→
---
25-pin connector