"How to control ring indicator in RS232 Protocol"

[Badri.S]

Dear All,

I'm trying to simulate the properties of a modem using a virtual com port, so I need to control the ring indicator from labview application for simualting the modem properties.Kindly provide us idea for controlling the ring indicator signal from labview.

Thank you.................

[ejkaiser]

Hi,

you can use a property node on the VISA Resource Name and select the property VISA Serial > Modem line > RI status. You also have all the other status lines available this way.

Cheers

Edgar

[Badri.S]

Hi Edgar,

That property node is only for reading the status of the RI signal. If we try to assert the line using that property node you will get error.

Thank you.

[ejkaiser]

In RS232 all signals are unidirectional with different directions in DCEs (modems) and DTEs (computers). RI is an output line in a modem and an input in a computer.

You will need to use one of the DTE output status lines, that is either RTS or DTR. I don't think there is a way to use RI as output from a computer.

Cheers

Edgar

[Dennis_Knutson]

---

---

edit - removed