I have a scope connected to my canH line and ground and noticed there is some distortion on the waveform in my setup.
- PCAN-USB device (https://www.peak-system.com/produktcd/Pdf/English/PCAN-USB_UserMan_eng.pdf)
- a DB9 breakout box (https://www.amazon.com/dp/B01C2WDU78)
- 2M of CAN cable (https://www.amazon.com/dp/B078VPWPKL).
I have spliced the CAN cable to connect the PCAN-USB device via the breakout box. I measure 60 ohms across the canL and canH pins (pins 2 and 7 of the breakout, respectively).
The PCAN device has two pins marked as GND (3 and 7). I connected these to the power supply ground...is that OK? The PCAN device itself is connected via USB to my laptop so I wasn't sure where to connect this.
Any idea what can cause the distortion ? Do I need to tie the cable shielding to my power supply ground as well?