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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.
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.