I am trying to get my Fluke 45 working with serial communication. I have one of these cheap USB-to-serial adapters. When I plug it in to the Fluke, the display shows all segments and freezes. I did a search on this forum and found that someone solved the problem by using a null-modem cable, although using a hardware serial port to connect to the PC. I have made up a null-mode cable but have so far been unsuccessful in making this work. Baud rate and parity are set correctly on the meter to match my terminal client. Using a logic analyzer I can see data being transmitted, but nothing being received back from the meter.
Unfortunately, Fluke does not document the pinout but does refer to RS232, so standard 9 pin RS232 is assumed at the moment. Only pins 2,3,4 and 5 are present which narrows down the possible permutations. Has Fluke used a non standard pinout on these?