Pair of PICs, Xbee's and rs232

[Michael]

you beat me to it -- funny because i tried a chip inversion to try and fix it but no go -- then I tried T1200 (was using N1200).

the xbee must need true? changed both the rcvr and xmtr to T1200 and they work fine -- which tells me the sn75176 must invert as well.

[amgen]

ok, why the 2 485 chips each and don't you want to go to higher baud like 38k or more ?

[Michael]

Simple I/O Industrial control -- opto isolated and 1200 baud for reliability -- the rs485 chips are there because the PCB will retrofit into another product.