Hi Ken,
The 7200 doesn't use an isolated RS485 port, therefore the signals are
referenced to the system 0V. An isolated RS485 port would need a 0V reference,
which could be connected to the 7200 0V.
Regards,
PJE
--- In "kenbiss" <> wrote:
>
> I have been using the 7200 for a while now connecting to various 485 modbus
> devices and have had no problem just using the +tx/rx (pin 1) and -tx/rx (pin
> 6). I am now looking at other 485 devices that refer to a 485 signal common
> in addition to the +tx/rx and -tx/rx. I've noticed on the COM2 Serial Port
> Pin Configuration of Connectors that there is no "common" pin labeled, only
> the +tx/rx (pin 1) and -tx/rx (pin 6), this particular manufacturer is
> adamant that we have to use the common pin to make the communications work, I
> am confused because the ts7200 does not provide a common, only a +,-, and
> ground.
>
> Thanks
> Ken
>
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