First off, I searched for this question and while I found other similar questions, none had an answer for this.
I've got a serial cable from a (Linux) PC supplying data to a PCB (AVR XMEGA). I'm trying to monitor the data sent across this serial cable using a Bitscope.
I've got CHA connected to pin 3 of the serial port DB9 (FWIW, this is a UART-backed serial port, not a USB "serial port")and GND connected to pin 5 of the DB9.
No matter how I change the Bitscope settings, I can't get anything resembling a square wave, whether data is being transmitted across the serial port or not. The attached image is all I can see.
Sorry to be such a n00b, but if anyone can tell me what I'm doing wrong, I'd appreciate it.