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17
Interface connector terminal assignments and signal functions
Pin number
Signal name
Signal Source
Description
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)
。
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 (printer side): 36 pins Centronics connector