Hi,
Please check the what are the inputs are captured by your attendance machine like swipe card number, date & time, In/Out mode (toggle switch or F1/F2 keys etc). Our terminals were using fingerprint to identify the emp-id in combination with smart card and was using F1-key for In-mode and F2 key for out-mode (and even F3 & F4 for break-in/break-out modes).
Here the role of BASIS, ABAP, Functional & IT team are very essential to integrate this process.
regards,
Bala.