USB Diagnostic Adapter: Access Engine Control Unit

Hello,

Unfortunately, due to a recent purchase, my laptop no longer has an RS232 interface. Therefore, I acquired a USB adapter that currently emulates the COM4 port.

Unfortunately, I can only currently log in to the engine control unit; I can't find the others anymore.

Does anyone have a solution for me?

Best regards,

Toby.

This has been discussed in several threads here, with the note that it might work, but it doesn't have to. Ross-Tech discourages the use of such adapters.

As I said: it might work, but it doesn't have to. It seems you belong to the latter group...

Hello,

Yes, buy a reasonable USB diagnostic adapter .

The reason is as follows: When a diagnostic interface without its own intelligence (microprocessor) is used with VAG-COM, the Windows PC must control the entire timing of the diagnostic protocol.
Windows is not a real-time operating system, and there are no corresponding kernel drivers. Therefore, no programs that may temporarily halt the system (such as antivirus software) should be running while using VAG-COM.

When a COM port is emulated via USB, an additional, undefined timing behavior is introduced.
Emulated COM port, driver -> USB driver -> USB controller on the motherboard -> USB to COM interface converter -> serial level converter -> K-Line -> microcontroller in the gateway/control unit. This is not going to work properly.

The KKL+CAN (USB) diagnostic system looks like this:
USB Driver -> USB Controller on the Mainboard -> Microcontroller in the Diagnostic Adapter -> K-Line/CAN -> Microcontroller in the Gateway/ECU. Due to the built-in microprocessor, timing problems are almost eliminated.

Best regards, Rainer.

or:

Use a reliable USB-to-serial adapter.

'In their professional roles, our field technicians need to operate a wide range of devices with COM interfaces. However, the new laptops only have USB ports.'
There are huge differences between various adapters.
'When he's back, I'll ask him what exactly he has.'

CU Gremlin.

...or search within this forum...

There is experience in this regard.