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Process Instrumentation / Analyzer Systems / Weighing Technology / Valve Positioner / MI Digital Solution: Siwatool "interface error" Including siwarex Ftc

Hello,
We are in the process of commissioning a Siwarex FTC card (7MH4900-3AA01) on a test bench before installing it in the field. However, we are currently unable to establish a connection to the card using both Siwatool V2 and V4.
The test bench is equipped with the IM-153-1, and we are trying to connect with a Field PG.
Siwatool V4 
displays the error: "The connected module cannot be accessed by this application."
Siwatool V2 
shows: "Communication failure."
We are using an ATEN USB-Serial converter (UC-232A) + new driver, and there is no MMC inserted into the FTC card.
We have not encountered any issues when using Siwatool V4 with a Siwarex-U card and the "7MH4607-8CA SIWAREX U CONNECTING CABLE."
Any ideas for what could be wrong?
Going to test communication with another PC today, will keep this updated.
edit: Same errors with another PC.
edit 2: Problem was a faulty null-modem cable..

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