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4
4. Interface
4.1 Specifications
Data transmission: Serial
Synchronization: Asynchronous
Handshaking: DTR / DSR
Signal level:
MARK = -3 to –15 V (logic “1”)
SPACE = +3 to +15 V (logic “0”)
Baud rates: 4800,9600,19200,38400 bps
Parity: None, even
Bit length: 8 bits
Stop bits: 1 or more
4.2 The communication flow
Data flow :
PC/host to display, Display to printer, Printer to
PC/host
Handshaking flow :
Display to PC/host, printer to display,
PC/host to printer
Note: There are 200 bytes resident buffer in the display for pass data to printer. If PC/host keep
transmitting the data to printer when the display inactive DTR or RTS , data will be lost.
Customer
display
Host
computer
Receipt
printer
C
ontrol connecting direction
Data connecting direction