Lexmark C762 Manuel D’Utilisation
Interfaces
8-10
The parallel interface consists of an 8-bit parallel data bus with the following
characteristics:
characteristics:
•
Uses 17 of the 36 positions on the printer connector, as follows:
— The host system controls 12 lines, which it uses to send data and com-
mands to the printer.
— The printer controls five lines. The printer uses two lines to notify the com-
puter when data is transferred successfully and three lines to report printer
status.
status.
•
Controls synchronization with an externally supplied STROBE* pulse.
•
Controls data flow control with BUSY and ACKNLG* signals. Does not carry
out data transfer by ignoring the BUSY or ACKNLG* signal. (The system can
carry out data transfer to the printer only when the level of the BUSY signal is
low and after confirming the ACKNLG* signal is high.)
out data transfer by ignoring the BUSY or ACKNLG* signal. (The system can
carry out data transfer to the printer only when the level of the BUSY signal is
low and after confirming the ACKNLG* signal is high.)
•
Uses standard transistor-transistor logic (TTL) levels for all interface control
signals and input data. Interface conditions are based on TTL levels. All
printer outputs are totem-pole TTL devices. All printer input/output (I/O) are
devices with an internal pull-up resistor to 5 V. Rise and fall times of each
signal must be less than 1,500 nanoseconds (ns) without slope reversal.
signals and input data. Interface conditions are based on TTL levels. All
printer outputs are totem-pole TTL devices. All printer input/output (I/O) are
devices with an internal pull-up resistor to 5 V. Rise and fall times of each
signal must be less than 1,500 nanoseconds (ns) without slope reversal.
Note:
For best results, use the Lexmark 1.83 m (6 ft) parallel cable, part number
11K4078.
11K4078.
The following illustration shows the pin assignments for connecting the 25-pin
connector to the 36-pin connector. The symbol * indicates an active low signal.
connector to the 36-pin connector. The symbol * indicates an active low signal.
The parallel interface consists of an 8-bit parallel data bus with the following
characteristics:
characteristics:
•
Uses 17 of the 36 positions on the printer connector, as follows:
— The host system controls 12 lines, which it uses to send data and com-
mands to the printer.
— The printer controls five lines. The printer uses two lines to notify the com-
puter when data is transferred successfully and three lines to report printer
status.
status.
•
Controls synchronization with an externally supplied STROBE* pulse.