simulating a modem

[Laurent Boizet]

I want to simulate a modem with Labview. there are some data transfer whch
are made with RX/TX: no problem. But I can't command the DCD line (pin 1 on
DB9, 8 on DB25).
The modem hold the line around -8V at the begining. When he dials the
telephone number and get an answer, the DCD line goes to 0.

Any hint to command this line ?

Laurent

[Helmut Hullen]

Hallo, Laurent,

Du meintest am 29.10.99 zum Thema simulating a modem:

> I want to simulate a modem with Labview. there are some data
> transfer whch are made with RX/TX: no problem. But I can't command
> the DCD line (pin 1 on DB9, 8 on DB25).

That's right - you can only read this register.

> The modem hold the line around -8V at the begining. When he dials
> the telephone number and get an answer, the DCD line goes to 0.

That's ok - the DCD flag is "active low". It is set to 0 when the UART
detects a carrier.

Viele Gruesse!
Helmut