Configuration
4.9 Serial interface
CP 1243-8 IRC
84 Operating Instructions, 02/2018, C79000-G8976-C385-03
Dedicated line
Settings dedicated line
Only the configurable parameters are explained.
Settings serial interface
●
Standard of the serial interface: RS-232 / RS-485
Select the following value:
– RS-232
When a modem with an RS-232 interface is connected to the interface of the CP
– RS-485
When a modem with an RS-485 interface is connected
With parallel connection of several modems to the interface (star-shaped network).
Not relevant for the CP with the Network node type "Station".
●
Enable the option when connecting a terminating resistor for the RS-485 bus when a star-
shaped network is connected.
Number of spontaneous frames
●
Number of spontaneous frames
Only for interfaces with the Network node type "Station" / "Node station".
The parameter decides after how many frames the master station has the opportunity of
transferring its pending frames to the station. As maximum, the configured number of
spontaneous frames that are pending at the time of the first call frame are transferred.
Default setting: 200. Permitted range: 0...255
If 0 (zero) is set, all spontaneous frames are sent at the call.
●
Time offset (s) with slow networks to prevent premature stopping of connection
establishment.
Default setting: 10. Permitted range: 0...65535. If 0 (zero) is set, the function is disabled.
Usually in dedicated line networks the value is 0:
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