I have an instrument, an Heise Model 170A pressure transducer with output described on page 6 of the manual as follows:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

4.1 SERIAL OUTPUT

ASCII encoded 8-bit data pluse one start and one stop bit.
Data rate: 1200 baud
Interface: Two wire hookup, EIA RS-232-C Standard.
See page 8 for barrier strip identifications.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

And sure enough page 8 shows a pair of screw terminals beneath a "Serial Out" lable, marked as "Common" and "Signal".

I have only gotten as far as installing on my WinXP box the modules, Win32::API, Win32::SerialPort, Win32API::SerialComm, but not any further.

I had thought RS-232C took more than two wires...that two wires was RS-422. And I can't find any more info on either the device or on two-wire RS-232.

Any and all clues will be welcome.

2006-10-09 Retitled by g0n, as per Monastery guidelines
Original title: 'How to read a 2-Wire RS-232-C line?'

In reply to (OT) How to read a 2-Wire RS-232-C line? by aplonis

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