I need to interface a PIC-based circuit to a few devices (PID=20
temperature controllers) via RS485/modbus, and looking for suggestions=20
on a simple way to do this.  This is a one-off project for my reflow=20
oven, so I'm looking for an off-the-shelf interface.

Signal-wise, RS-232 to RS-485 is fine, and I can find interfaces from $5=20
to >$100, so not sure what features I should be looking for.  I don't=20
mind getting something on the higher end of that range if I can trust it=20
will be reliable and work properly.  An open (ie: non-enclosed) PCB=20
would be ideal, as I'll add this inside the enclosure with my own=20
circuit board.  TTL-level serial would also be preferred rather than=20
RS-232 level... if that choice exists.

Any recommendations?

Thanks,
-Neil.

--=20
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