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Serial Communications Section 6-3
PLC Setup
PT System Menu Set the PT as follows:
1,2,3...
1. Select NT Link (1:N) from Comm. A Method or Comm. B Method on the
Memory Switch Menu under the System Menu on the PT Unit.
2. Press the SET Touch Switch to set the Comm. Speed to High Speed.
6-3-8 1:1 NT Links
The NT Link communications protocol was developed to enable high-speed
communications between PLC and Programmable Terminals (PTs). There are
two communications modes supported by the NT Link protocol: 1:1 NT Links,
in which one PLC is connected to one PT, and 1:N NT Links, in which one
PLC is connected to more than one PT.
Connections With the NT Link protocol, the PLC auto-
matically responds to commands sent
from the PT, so no communications pro-
gramming is required in the CP1L.
Port Name Settings contents Default values Other conditions
Serial port
1 or 2
Mode: Communications mode NT Link (1:N): 1:N NT Links Host Link Turn OFF pin 4 on the CPU
Unit DIP switch hen using
serial port 1 and turn OFF pin
5 when using serial port 2.
Baud: Baud rate 38,400 (standard)
115,200 (high speed)
9,600
(disabled)
NT/PC Link Max:
Highest unit number
0 to 7 0 ---
OMRON PT
NT Link
RS-232C
CP1L
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