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DATA
I/BAUD
START
BIT
Serial interface signals
Signal name Input/Output
DATA
Input
STATUS
Output
GND
Data format
One (1) Start bit
Eight (8) Data bits
No parity
Two (2) stop bits
Description
Receiving eight bits of serial data from the host
computer.
This signal indicates to the computer whether or not the
printer can accept data.
The "off" condition (Low) indicates that the printer is
BUSY and cannot accept any more data.
The "on" condition (High) indicates the printer is NOT
BUSY, and can accept more data from the computer.
This signal wire establishes a common ground between
the printer and the computer.
Timing diagram
LSB
BITl
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
MSB
BITS
STOP
BITS
READY
(SP ACE)
STATUS
SPACE=Logical 0
MARK=Logical l
BUSY
(MARK)
+ lSV>SPACElevel>
+3V
-3V > MARK level >-lSV
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