On Sun, 9 Apr 2000, Shourya Sarcar wrote:
>
> is it possible to design some kind of a loopback on the serial port so
> that i can send out a message and read _that_ back using the serial port ?
> i want to write a communicating s/w for a 8085 microprocessor but since i do
> not have a 8085 with me now , i want to simulate that.
For DB25:
TxD 2 --\
RxD 3 --/
RTS 4 --\
CTS 5 --/
DSR 6 --\
DCD 8 --|
DTR 20 --/
For DB9:
DCD 1 --\
DTR 4 --|
DSR 6 --/
RxD 2 --\
TxD 3 --/
RTS 7 --\
CTS 8 --/
NOTES:
1. If you don't need control signals, just the TxD / RxD connection will
work fine.
2. Almost all UARTs are configurable to local (internal) loopback mode. I
just don't know whether all drivers provide this functionality to a
userspace app. Therefore, you might be better off doing the external
loopback connector, as it's hardware-independent.
Hope this helps.
Regards,
Ivan
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