Lexmark XS795 Printer Languages and Interfaces Technical Reference - Page 135

Lexmark XS795 Manual

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Printer interfaces 135 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. Printer Side Computer Side 36-Pin Connector 1284-B 25-Pin Connector Note: Lexmark IEEE 1284 compliant cables are supported up to 20 feet. Cable lengths greater than 20 feet are not supported. The cable drawing to the left is a functional representation of the Lexmark cables; it does not reflect correct pairing of leads or unused pairs. The parallel interface consists of an 8-bit parallel data bus with the following 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 commands to the printer. - The printer controls five lines. The printer uses two lines to notify the computer of successful data transfer, and three lines to report printer 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.) • 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.

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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.
Computer
Side
25-Pin
Connector
Printer
Side
36-Pin
Connector
Note
: Lexmark IEEE 1284 compliant cables
are supported up to 20 feet. Cable lengths
greater than 20 feet are not supported. The
cable drawing to the left is a functional
representation of the Lexmark cables; it does
not reflect correct pairing of leads or unused
pairs.
1284-B
The parallel interface consists of an 8-bit parallel data bus with the following 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 commands to the printer.
–
The printer controls five lines. The printer uses two lines to notify the computer of successful data transfer,
and three lines to report printer 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.)
•
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.
Printer interfaces
135