AdvancedHMI Software

General Category => Support Questions => Topic started by: scott.clark on April 08, 2021, 12:14:15 PM

Title: ModbusTCPCom1 Unknown error code -34
Post by: scott.clark on April 08, 2021, 12:14:15 PM

I am receiving this

Title: Re: ModbusTCPCom1 Unknown error code -34
Post by: Archie on April 08, 2021, 12:18:43 PM

The -34 is typically a "could not connect" error in the ethernet drivers.

Title: Re: ModbusTCPCom1 Unknown error code -34
Post by: scott.clark on April 08, 2021, 05:34:14 PM

That is interesting.  I will test more on some different machines and see if the same connection issues exist.  Maybe it is my development PC.

Thank You!

Title: Re: ModbusTCPCom1 Unknown error code -34
Post by: scott.clark on April 14, 2021, 05:26:47 PM

The cause of the -34 was an unreliable USB - Ethernet adapter.  It would drop in and out of connection.  When I switched over to the built in ethernet port on the PC, I never saw the issue again.   Confirmed the adapter issue by using the command prompt and issuing ping command with -t option.

Thanks