Citizen Systems Citizen CMP-10BT - Manual (Page 26)

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4.4 Communication Via Serial Port (Cable)
For communication via serial (RS-232C) interface, use Citizen CA10-01
serial cable.
When the printer is OFF, open the serial port rubber cover and while
holding the connector with the “PUSH” sign facing upward, gently
insert the connector into the serial port.
Connect the other end of the cable to the device to be connected.
To disconnect serial cable from the printer firmly press “PUSH” sign
on the connector and remove it from the serial port.
Push serial port rubber cover back into the serial port till it fits in firmly.
CAUTION!
If the cable is connected with Power ON, turn the Power OFF once and then
turn the Power ON again to activate the connection with serial cable.
Set the flow control setting of the device to be connected to Xon/Xoff. In
case of hardware control (DTR/DSR control), the Power switch may become
disabled.