I have a pair of 16c65B, one as a xmtr using serout and the other as a rcvr using serin.

When I hardwire the output pin to input, everything works great. I normally have an optoisolator in there and it works fine either way...with or without.

I bought a LINX ES 916mhz xmtr and rcvr module and was hoping that it would be a simple plug and play but so far, no luck.

I have a scope connected to the data output on the rcvr module....the data is there and looks fine but when I connect to the rcvr pic (or the opto), I lose the waveform and get nothing.

I tried some series resistance, which gets the waveform back but still no action on my rcvr.

Could someone tell me what I'm doing wrong?

It has to be something simple.

I even inverted the data for the heck of it but obviously this is an interface problem as I'm losing signal completely.

--thanks