Re: [ts-7000] Re: Using libmodbus on a TS-7800

[Jaime Alberto Silva <>]

If you check the schematic (http://www.embeddedarm.com/documentation/ts-7800-schematic.pdf) on page 6 you'll notice that the receiver is always on.

When you write on picocom can you see on the sender side what you're writing ? I've tested it with minicom running on the TS-7800 and when local echo is off I can see what I write, when I turn echo on, every letter I type is printed twice. This happens even when the port is unwired (nothing connected to it) therefore transmitted bytes are echoed (at least on my board).

Jaime Alberto Silva Colorado
Director de Proyectos de Ingeniería
S.G. Automatización Ltda.
http://sgautomatizacion.com

On 10/24/2011 01:19 PM, Harold wrote:

 

--- In , Jaime Alberto Silva m("...","jaime");"><> wrote:
>
> Hello everyone.
>
> I'm using libmodbus.org on a project and found that the RS485 ports on
> the TS-7800 are wired in such a way that everything you write to the
> port gets echoed to the receive buffer so the library fails because it
> takes the sent frame as the response frame :s
>

Are you sure that the TS-7800 does this? I have not seen this when I have used RS-485 on the TS-7800. Furthermore, I just now tried writing to a TS-7800 RS-485 port, using picocom, and I did not get anything echoed back. This sounds like something in your wiring is reflecting the transmitted data back to the TS-7800, and by the time it gets back, the transmitter has been turned off and the receiver turned back on.

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