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-18-
2.1.1.2 Serial interface connection example
Printer Side DB-25
POS RS-232 Connection Db9
2.1.1.3 Interface connector terminal assignments and
signal
functions
NOTES: Set the handshaking so that the transmit
data can
be received. Transmit data to the printer after
turning on the power and initializing the printer.
2.1.2) IEEE 1284 Bidirectional Parallel Interface
(Parallel Interface Specifications)
2.1.2.1) Parallel Specifications
Data transmission Parallel
Synchronization:
Externally supplied nStrobe signals
Handshaking:
nAck and Busy signals
Signal levels:
TTL compatible
Data word length: 8 bits
Connector:
36 pins Centronics connector
(printer side)
Pin
Signal
Signal
Description
Number name
Source
2
TXD
Printer
When using XON/XOFF
handshake protocol, printer
transmits control code
XON/XOFF
3
RXD
Host
Printer receives data from host
4
RTS
Printer
Indicates printer current status,
whether the printer is Busy or
Ready to receive data
7
GND
Signal ground
20
DTR
Printer
Same as RTS (pin 4)
Page Index [1] [2]
[3] [4] [5]
[6] [7] [8]
[9] [10]
[11]
[12] [13] [14]
[15] [16]
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