The Serial Interface - Epson LQ-2500 User Manual

The Serial Interface

The LQ-2500 standard serial interface is an RS-232C interface with
the following characteristics:
Synchronization
Asynchronous
Data format
1 start bit
data
word length: 8 bits
odd, even or no parity
1 stop bit
Baud rate
300, 600, 1200,4800,9600, 19,200 bps
Signal level
mark (1) -3 V to -27 V
space(O) +3 V to +27 V
Handshaking
Handshaking by DTR signal or X-on/X-off. The DTR signal changes
to "mark"-meaning the printer is not ready to receive data-when
the number of bytes free in the input buffer goes down to 256. The
signal changes to 'space"- meaning that the printer is now
ready-when the number of bytes free in the input buffer rises to
528.
The arrangement of pins is shown in the figure below:
Figure H-2.
Senal intetface
Interface Specifications
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H - 3