Work with RS232 interface

Hi all!
I want to sent commands on specific RS232 devices (on local machine, NOT WITH SERVER devices).
While searching , find some discussion about it, here says - you can communicate it with Cirrus for example. So, im never worked with Cirrus.
Please tell me, how I can communicate with local machine COM ports .
So if its possible, show me instructions for start work with Cirrus ( inital knowledge)
Thank.

If it has an RS-232 interface, you should be able to do it..
It may simply send an id-tag when it is in proximity..  The proximity simply sends enery to a coil (transformer) which activates the chip to transmit a small RF signal containing the badge id. 

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