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Serial Communications Section 6-1
6-1-6 1:N NT Links
In the CP Series, communications are possible with PTs (Programmable Ter-
minals) using NT Links in 1:N mode.
Note Communications are not possible using the 1:1-mode NT Link protocol.
High-speed NT Links are possible in addition to the previous standard NT
Links by using the PT system menu and the following PLC Setup. High-speed
NT Links are possible, however, only with NS-series PTs or with the NT31(C)-
V2 or NT631(C)-V2 PTs.
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.
CP1H CPU Unit
NS-series or NT31/NT631(C)-V2 PT
RS-232C
1:N NT Link
NS-series or NT31/NT631(C)-V2 PT
RS-422A/485
1:N NT Links
CP1H CPU Unit
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 ---
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