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USB to null modem RS232 adapter

A cd with drivers is included with this adapter cable, but if you are unable to use that you can get the driver at this link:

USB to null modem RS232 adapter
Fluke Part Number: 2675479
Description: (884X-USB) USB TO RS232 CABLE ADAPTER (Null modem)
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    Kiriakos Triantafillou

    Is there any explanation of why all 884X they can not operate at any Boud Rate higher than 9600, even with direct RC-232 cable ?
    I have test Fluke software, Tektronix software, and all failed.

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