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Card time-clock speed/per machine applies to how many
attendants?
 Reaction
speed is 0.1 second. Generally, one machine can work for
300-500 people.
Can the card clock send message?
As
the info flow is very limited, so whether the info can
be received is not guaranteed, meaning it's not the best
way to send info for now.
What
are the reasons for the data lose of the card clock?
 Communication
method
No
record for the swiping due to current interference
Data
save lost due to power cut
Sudden
line disconnection during communication
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