Oct 082015
 

USB-RS-232 adapter cable:

You will see that many people have hit and miss luck with various manufactures of these devices. The difference is usually the chipset used by the device.

You can short circuit pin 2 with 3 on DB9 and see weather do you receive the same data you have sent over COM. If you do so it means that your USB-RS-232 adapter cable working properly.

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