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  1. 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 what the input voltage is I don't get any response at all from the UPS. In fact it doesn't matter what command I send, I get the same results. The config vi runs with no error, Open and write also run without errors, when I use bytes at port it returns 0, above I just ask for 1024 but the results are always the same, the read function times out with an empty read buffer. I think next week I'll go into the lab and try using the PXI-8430 and a straight through serial cable. I just really think this should be working... Does anyone see anything I'm missing? Thanks, Bob
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