Setting RS232 control lines programmatically

[smercurio_fc]

I'm also confused as to what TCP/IP has to do with the serial port.

[RJ_15]

Ok lets get started now.

1. I am having a server PC where Virtual MODEMs have been configured using Virtual COM ports.

2. I am the client where I am simulating another MODEM.

3. I am sending some AT Commands to initialize the MODEM on the server side to start my actual communication.

------- This all is done using TCP/IP as there is no hardware present.

4. Now I am making a call to Server MODEM for that I am sending 'RING'...'RING'.... commands.

5. Now for server MODEM to accept the incoming call first it should know some call is coming to it.

   So when I set the RING INDICATOR high only then it will accpet the incoming call.

See the control lines of the Server MODEM: