What do you mean by "single device is connected full duplex"? That does not
make sense. Full duplex means that it can transmit and receive at the same
time, which means it has separate transmit and receive connections. RS-485 uses
the same differential pair for both transmit and receive, in half duplex, doing
one at a time. It is not possible to connect an RS-485 device to an RS-485 port
full duplex.
Usually you can set up an RS-485 port so that it defaults to receive mode, and
automatically switches to transmit mode only while it is transmitting, then
switches back to receive mode when it is done transmitting. But I have never
used an RS-485 port on a TS-7260, so I cannot say how it works there.
Most often, RS-485 communication problems are due to incorrect wiring, since
everyone seems to use different pinouts.
--- In Jim Jackson <> wrote:
>
>
>
> I'm trying to speak to a single RS485 device connected to the second port
> of a TS7260 with the RS485 option.
>
> I've never dealt with rs485 before. Am I right in thinking that, if a
> single device is connected full duplex, then I should just treat,
> programming-wise, the interface as if it was an rs232 port?
> 'cos I've done that and am getting nothing. I'm getting the guys that did
> the hardware to double check their wiring to the COM2 header.
>
> If any RS485 expert could give any hints/advice it would be much
> appreciated.
>
> Jim
> p.s. the rs232 code works fine on /dev/ttyTS0 (com3) and on the serial port
> of my development machine.
>
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