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The tell command LNSTAT OPEN/CLOSE stops communication (CLOSE) and disconnects the communication port. Communication resumes after the LNSTAT OPEN command or when the communication process is restarted.
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The /DBSH startup parameter for Serial, Serial Line Redundant, and Modem communication lines causes the serial port to be closed if the D2000 KOM process is connected to an SBS Server or if the D2000 KOM process becomes a passive instance. This makes it possible for a redundant D2000 application (or an application with multiple redundant D2000 KOM processes) to use virtual serial ports that can only be opened from one computer. An example of such a serial server is Moxa OnCell. On the other hand, for example, Moxa NPort serial servers allow configuring up to 4 connections per serial port. The following screenshot of the NPort Administrator program shows the configuration of the Moxa NPort serial port in "Real COM Mode" (virtuálny sériový port) with a maximum of 4 connections.
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