Citizen CLP-621 User Manual page 16

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Setup
Part Names and Functions
Serial Interface (p.52)
Parallel Interface (p.54)
USB Interface (p.57)
Power ON/OFF (p.19)
Connection to Power (p.17)
Rear View
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5
1 Serial interface (RS232C)
This receives serial transmission of data from a host computer.
2 Parallel interface (Centronics parallel or IEEE1284)
This receives parallel transmission of data from a host computer.
3 USB interface
This receives USB transmission of data from a host computer.
4 Power switch
The is the power switch for the printer.
5 Power cord inlet
The connector of the enclosed power cord is connected here.
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