Re: [opendiag] DCD/DTR/DSR signals, loopback test, connector layout, component choice

On Wed, Aug 30, 2000 at 07:37:56AM -0000, arnold.neugebauer@... wrote:
> Jeff described a way to test the adapter with a terminal program
> (loopback over the K-section, it does not test the L-section). I had
> no success with this method (I tried three different notebooks). RTS
> was always high and therefore reception disabled regardless of the
> flow control used. Perhaps there are serial interface chips or drivers
> where RTS defaults to low, when the flow control is disabled and it
> works. In general it does not. Nevertheless it's a good way to test
> the adapter.

RTS is set by software. My trick was to use a comm program that would
let me force RTS low. Actually, I modified the Linux version of Minicom
to do that. I might have forgotten to mention that to a few people. :-)

Another solution I used (under Windows) was to grab RTS from the second
serial port. As long as it is not open by an application, it will be low.

Thanks for your comments!

Regards,

Jeff

 
Received on Wed Aug 30 08:33:46 2000