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which of these cable is working with hipro serial?

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Does your computer have a serial port? It must be very old?

c3

Most ppl who use this (old-obsolete-junk serial Hi Pro) use use a USB cable with the correct USB-to-serial adapter for connecting the serial Hi Pro to a modern computer (with USB ports, and no Serial ports).

Only 4-pins are used on the mini-Din cable output to hearing aids. A Standard CS44 cable has the following pinout (Except CS44A Phonak/Unitron) cables have Pins 3&4 rever4sed;

c1
c2

Hi pvc, is price reason to choose serial hipro and I did have old computer with serial port but also I will find usb 2 serial later but not urgent.
But I still need to know which of the 3 serial cables on picture can work with serial hipro. I believe it should be no.2 or no.3.

Edited

Well we didn’t pay much attention to the serial cable connection from a PC with a serial port to the serial port on the serial Hi Pro because everyone was using newer computers without serial ports. Thus the efforts were trying to find connections using USB.

HMm; I am not even sure if the older computers and OS will support newer versions of Fitting software. Before we spend too much effort on getting serial ports working, which OS and which version of fitting software are you planning to use? Maybe we should look at the requirements for that version of fitting software? For example;

c1

https://madsen.hu/pdf/tajekoztato/Hi-Pro_COM_Technical_Specifications.pdf30

The Serial Hi Pro specs (posted above) say RS 232C. There are many pinouts for RS 232 but not for RS 232C. so I found this description of the difference;
The RS-232 Standard has gone through several revisions over the years. In the original RS-232, the signal would flip between positive and negative 25 volts. Since that point there have been three revisions, RS-232A, RS-232B, and RS-232C; these revisions lowered the acceptable voltage from 25 to 12 to 5 volts respectively. In 1969, the Electronic Industries Association Standards Committee adopted RS-232C as a standard for computer manufacturers. Because this adoption date was so long ago, most manufacturers, including National Instruments, have dropped the “C” from the name and simply refer to the protocol as RS-232. In common, modern usage, there is no difference between RS-232 and RS-232C, protocol.

and here’s a link; rs232 - What is the difference between RS-232 and RS-232-C? - Electrical Engineering Stack Exchange5

Edited

it seems all the three on the picture are rs232c. fitting software should be target. I downloaded the 8.0.2 version, but I want to try an older version like 6 or 7

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