Citizen Systems CMP-10 - Manual (Page 28)

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4.5 Reading Mag Stripe Card (Only Model with Built-in Mag Stripe Card Reader)
To read the mag stripe card, it is necessary to send a special command
to the printer.
For the command, refer to Command Reference supplied separately.
If mag stripe card command is entered, Power LED lights red.
While the Power LED continues to light for 10 seconds, swipe the card
be read during that time.
If 10 seconds has passed or reading is completed, the printer returns to
normal mode.
Slide the card with the magstriped surface down to pass the magstripe
over the reader part.
When reading has completed, buzzer sounds momentarily and Power
LED changes to green.