/dev/dsp

[Nicholas Wourms]

Jacek Trzcinski wrote:

>Hi Corinna,
>the best way would be to connect any device on serial port which
>utilizes both one of output lines(DTR and RTS) and one of input lines
>(DSR, CTS, RI,CD) and test it. I do a lot of work with smart card
>readers. One of models utilize RTS and CTS line. I tested my patch this
>way ( converting my existing Windows reader driver to Cygwin driver)
>seting in needed moments RTS line and reading CTS line. All of course by
>ioctl() function. I realize You may not have such device but if You have
>in Your company any person who is able to prepare D-SUB9 or D-SUB25
>female connector( making loops between inputs and outputs) and connect
>it to Your male PC serial connector, You will be able to set requested
>output lines states and read them by input lines.
>
In other words, a serial loopback plug, which should be the part of any 
respectable computer technician's toolkit [very useful for verifying the 
integrity of serial ports].  I'm sure the one who works for your RedHat 
branch should have one.  Jacek, shouldn't it also be possible to port 
minicom and use that in conjunction with a modem to see if the signals 
are being sent and recieved?

Cheers,
Nicholas