Lexmark Printer manual Ieee 1284-C Ieee 1284-A

8-13

Interfaces

•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.

141

1836

Computer

PrinterSide

Side

IEEE 1284-C

IEEE 1284-A

	36-Pin	25-Pin
	D-Shell	D-Shell
	Connector	Connector
	(Male)	(Male)
1	19	25	13

Note: For best results, use the Lexmark 1.83 m (6 ft) parallel cable, part number 11K4078.