Lexmark Dot Matrix Technical Reference - Page 91
Using the Printer Interface, Parallel Interface, Parallel Interface Voltage Levels
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Using the Printer Interface Section 6 The printer interface is the physical connection point between the printer and other devices, such as a computer. The 2400 series printer offers a choice of three printer interfaces: parallel, Universal Serial Bus (USB), or serial. Use the parallel interface and parallel cable if you are attaching the printer to a personal computer's parallel port. Use the USB interface and USB cable when you are attaching the printer to a personal computer's USB port. Use the serial interface and serial cable when you: • share the printer using a printer sharing device. • need to connect the printer to a computer that does not have a parallel port, or to a computer that does not have an available parallel port. Parallel Interface Use Lexmark parallel cable 1329605 (3 m or 10 ft.) or 1427498 (6.1 m or 20 ft.). The parallel cable must be IEEE 1284-compliant and must support two-way (bidirectional) communications printing The parallel interface sends 8 bits (one byte) of data at one time and is transistor-transistor logic (TTL) compatible. Parallel Interface Voltage Levels The maximum voltage level for control or data lines is +5.2 volts. A control or data line is: • High, if the voltage is greater than +2.4 volts. • Low, if the voltage is less than +0.8 volts. 91 Section 6: Using the Printer Interface