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See also http://wiki.wws5.com/doku.php?id=pos_devices_-_pin_pads
Ensure you are not using a USB to Serial connector. PINpad and USB voltages do not match.
Ensure your a not running your PINPAD over wireless. We support Terminal Services via wireless, because there is not data being transmitted, just screen and keyboard, however PINPADs transmit data. Wireless networks will drop or delay data much more often than wired networks.