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Ithaca Series 70 Impact Printer
Centronics Parallel Interface
This section describes the implementation of the Centronics Parallel Interface for the IPI Series 70 printer. The following sections show the pin assignments, the communications sequence, and the timing diagram.
Pin Assignments
Data bit 8 is optional. It is connected to pin 16 through a jumper. The /ACK signal is also optional. It is coupled to pin 23 through a jumper.
Protocol
This section describes the implementation of the RS-232 Interface for the IPI Series 70 printer.
The following sections provide information for these topics:
o Features
o Pin Assignments
o Switch Settings
o Protocol
o Diagnostic Tests
Features:
o Up to 19.2K Baud
o 2K Buffer
o READY/BUSY or XON/XOFF Protocol
o Communications Diagnostic Mode
o Optional Firmware to Send Data From Printer
Switch Settings
Factory Settings
o 9600 Baud
o 8 Data Bits
o No Parity
o READY/BUSY Protocol
o DTR (Pin 20)
Protocol
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