Disclosed is a method in which a computer and a personal digital assistant easily and stably transmit commands and data through a serial interface and process them. To this end, the method for transmitting a command comprises: generating a command packet including a command frame, a length frame, a command data frame, an error check fame and an end character frame; and transmitting the command packet.

 
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> Personal digital assistant incorporating a print roll cartridge storing ink and print media

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