isolating RS-485 suggestions

[jibberjabber]

I've found a few basic ways to do this:

1) Use a standard non-isolated RS-485 transceiver, and isolate the
data/control lines going to it with 6N137 optoisolators.
2) Use an isolated transceiver.

With either of these methods you have to provide isolated power to the
transciever chip:
a) use a small isolated DC-DC converter
b) use a small transformer (P/N ??)

9600 baud, 300' distance

Any suggestions or alternate methods? thx

 

[Deefoo]

I've found a few basic ways to do this:

1) Use a standard non-isolated RS-485 transceiver, and isolate the
data/control lines going to it with 6N137 optoisolators.
2) Use an isolated transceiver.

With either of these methods you have to provide isolated power to the
transciever chip:
a) use a small isolated DC-DC converter
b) use a small transformer (P/N ??)

9600 baud, 300' distance

Any suggestions or alternate methods? thx

Go wireless with those small 400-something MHz modems.

or

- Ethernet.
- Current loop.
- Power the isolated transmitter by the receiver (i.e. use more wires)

--DF

 

[jibberjabber]

We're commited to 485 and I need to isolate a leg. Is there a "best" way
to do it?