I have been playing around with a Laipac TLP-434 RX TX pair the last day or two and been receiving nothing but garbage. I have connected the UART TX from a M32 to the TX data in, and the UART RX to the digital data out of a M8. While doing a sanity check (jumper from the TX data input to RX digital data output and jumping the grounds of the two boards together), I accidently connected the UART RX pin to the linear output of the RX, and the thing works. The RX is on a breadboard (which I expected to be a low level problem) and there is wire and cables running over the work bench, fluorescent lamp and all.
I spent an hour or so this morning reading previous post about TLP-434 and inexpensive ASK TX RX in general, so I was expecting poor performance, but I wasn’t getting anything using the digital output. Checked the datasheet from Laipac for pin outs and compared it against several schematics posted on the web to confirm it was wired correctly, BUT when I wire it wrong, it works.
Any suggestions what is going on?
Has anyone else experienced this? Shouldn’t it work better using the digital output?