How to read the voltage difference between 2 pins of an RS232?

[bratidiana]

Hi, I'm new in this field and I'm having a problem in acquiring data from a RS232 port. Actually, I'm not sure if it is possible to do it.

What I would like to do, is to read the voltage difference between two pins of the port. This is because I want to measure temperature (and save the data) in a very simple way. I have 6 thermocouples and I was thinking of welding them to different pins of the RS232 and acquiring the analog signals in mV with the computer. Then, I would use a thermometer to calibrate the values.

Is it possible to do this? How? I've been looking a lot but I cannot find any tutorial or example similar to this...

[Dennis_Knutson · Accepted solution]

No, it is not possible to do this with the serial port. The port is not an A/D converter. A simple RS-232 tutorial will tell you that port is binary in nature.

[bratidiana]

Thanks Dennis