Citizen CT-S251 Mode D'emploi page 32

Enabling and disabling auto reconnect
During self test, open the cover, press the FEED button 3 times and close the cover
-> Auto reconnect = Valid
During self test, open the cover, press the FEED button 4 times and close the cover
-> Auto reconnect = Invalid
At the end of self test, new setting will be printed as Auto reconnect [Valid] or [Invalid].
Panel button operation
Use the panel button on the rear of the Bluetooth board to operate this board.
 BT device search (MSW13-5) settings
1. Press and hold the panel button to turn on printer power.
2. Press the panel button within one second after starting the printer.
The setting changes in accordance with the number of times you press the panel
button.
Two presses: Discovery possible
Three presses: No response
After these operations the printer restarts.
Panel button USB port
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Refer to 4.3 Self Test