I'm having difficulty communicating with a Tripp-Lite UPS via serial RS-232.
One variable I need to rule out is the USB to RS-232 adapter cables I'm using. I seem to remember there being some chip sets that didn't work well so I thought I'd ask the group.
I've tried two different cables. The SABRENT Model CB-FTDI using the FTDI chipset and the UGreen using the Prolific PL2303 chipset.
Does anyone have any experience with these cables? Any cables/chipsets you have used before without problems?
I'm heading down this path because when I send a command that should ask the unit