Lexmark E323 Technical Reference - Page 351
Optional Parallel Connector (1284-C) on RS-232C Serial/Parallel 1284-C Interface Card
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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. 18 IEEE 1284-C 36 Printer Side 14 Computer Side 1 IEEE 1284-A 36-Pin D-Shell Connector (Male) 25-Pin D-Shell Connector (Male) 1 19 25 13 Note: For best results, use the Lexmark 1.83 m (6 ft) parallel cable, part number 11K4078.