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Typical interfaces

Parallel

Parallel
A communication system using parallel signal lines which transmits ASCII or JIS codes using data lines (4 to 8 bits).

Serial

Serial
A communication system to transmit data bit by bit.  There are two types; a synchronous and an asynchronous type.  Communication speed (baud rate) can be set.

CPU Bus

CPU Bus
A system to transmit data using the CPU,s address-bus, data-bus and R/W control line.
Like the case of memory access, parallel communication is available.

RS-232C

RS-232C
The industry standard for an asynchronous serial communication for general use.  Display is controlled by transmitting JIS code, etc.  Good noise protection.
Communication speed (baud rate) can be set.

Universal Serial Bus

Universal Serial Bus
The PC industry standard for high speed serial communication.  USB typically connects peripheral devices of a computer.

IrDA

IrDA
Infrared data communication (a communication system using the output of the infrared data communication of a cell phone). 
It is necessary to confirm the availability of this feature on any particular cell phone.