Re: [ts-7000] Re: serial port woes

[Onur T <>]

Hi Mike,

On my end I have had to build a small RS232 line driver circuit to talk to an embedded module which had CMOS outputs.

I could be mistaken but if the device you want to connect to is at CMOS or low power TTL and does not have a driver circuit build, you may have to build one( 1 chip, plexiboard, 1 week TV time ). A lot of times the embedded modules do not necessarly have the line driver interface built in, and may just give the TTL/CMOS outputs right from the chip.

Also as a quick try, try a power supply with more amperage. For me it got rid of a whole lot of problems just changing the power supply ( I suspect my embedded module and TS-2000 were drawing peak power at the same time and causing a reset on the TS-2000).

m g <> wrote:

On Wed! , Jan 18, 2006 at 07:28:05PM -0000, PeterElliot wrote:
> Another issue is that some low power devices used a scavenging
> technique to pull power from the unused lines to generate the voltage
> used for their serial output.
>
> Have you tried putting a scope on the output from the PDA to see if
> you are getting valid RS232 voltages?

Interesting. I had planned on hooking up a scope, just haven't had the
time lately to work on this problem. I'll post what I discover with the
scope.

I haven't worked with RS232 in a long time but I'm sure it is supposed
to work at TTL levels. But, how about 3.3-V? Is 3.3-V all that is
available on the TS? Time to do some research. If this indeed is the
problem, does anyone know of a solution? Am I the only one trying to
connect a low power device to the TS?

Thanks,
Mike

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