Interfaces
8-13
• 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.
Optional Parallel Connector (1284-C) on RS-232C Serial/Parallel 1284-C
Interface Card
The cabling in the following illustration supports Standard and Fastbytes protocols and
IEEE 1284 Nibble, Byte, and ECP protocols.
Note: For best results, use the Lexmark 1.83 m (6 ft) parallel cable, part number
11K4078.
18
36
1
19
14
1
25
13
Printer
Side
36-Pin
D-Shell
Connector
(Male)
Computer
Side
25-Pin
D-Shell
Connector
(Male)
IEEE 1284-A
IEEE 1284-C
