Lexmark Optra T Reference page 317

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Optional Parallel Connector
The cabling in the following illustration supports Standard and Fastbytes protocols and
IEEE 1284 Nibble, Byte, and ECP protocols.
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.
18
Printer
Side
IEEE 1284-C
36-Pin
D-Shell
Connector
(Male)
19
1
8-14
14
36
Computer
Side
25-Pin
D-Shell
Connector
(Male)
25
Interfaces
1
IEEE 1284-A
13