Unable to read data from Analog Devices 6b11 module - error code 1240

[nranranra]

Hi everyone,

I'm trying to read data from a thermocouple with an AD 6B11 module in an AD 6BP16-1 backplane using RS232 serial. I've been following this guide:

http://digital.ni.com/public.nsf/allkb/8C77E5E52B4A27968625611600559421

Everything seems to work out well until step 13, where I call the "AD6B Input Module - Read Data.VI". I get an error code 1240 stating something like "invalid parameter or unable to read instrument".

Has anyone got any experience with this error or suggestions to fixing it?

Thanks in advance!

[Dennis_Knutson]

That user guide is 20+ years old. The serial functions from that day used 0 for com 1, 1 for com 2, etc. Make sure you have the correct one selected. Please provide the exact error message instead of 'something like'.