RS232 autotest

[Vicky]

Hello,

I'm developing a diagnostic system which shall control
correction of installation RS232 circuit on a board.

I made a socket which has connected pins with pairs:
TxD-RxD, RTS-CTS, DSR-DTR.
If everything where installed correctly, when I set RTS,
I should see CTS set in my program too.
When I set DSR, I should see DTR set too.
When I send a character, I should receive it, thanks
to TxD connected to RxD.

The problem is with DCD and RI.
I think that these lines should have external circuit
connected to them, to make them change state from
0 to 1.
What kinds of external units should be connected to
DCD and RI ?

Thanks in advance,
Vicky.

 

[Joe Soap]

In response to what Vicky <vickyBADMAIL@hotmail.com> posted in news:cfb49a
$sv1$1@atlantis.news.tpi.pl:

Hello,

I'm developing a diagnostic system which shall control
correction of installation RS232 circuit on a board.

I made a socket which has connected pins with pairs:
TxD-RxD, RTS-CTS, DSR-DTR.
If everything where installed correctly, when I set RTS,
I should see CTS set in my program too.
When I set DSR, I should see DTR set too.
When I send a character, I should receive it, thanks
to TxD connected to RxD.

The problem is with DCD and RI.
I think that these lines should have external circuit
connected to them, to make them change state from
0 to 1.
What kinds of external units should be connected to
DCD and RI ?

DCD and RI are generated by modems. Why not connect RTS to these as well?

--
Joe Soap.
JUNK is stuff that you keep for 20 years,
then throw away a week before you need it.