INTERFACESTable 1-3 describes Centronics interface voltage and currentrequirementsTable 1-3. Centronics interface voltage and currentrequirementsVoltage levels 0 (zero) and +5 VDC (nominal), TTl (SN74LS00 seriesLogic levels Positive logic is assumed. A logic one(high) signal is defined as a voltage in therange of +2.4V to +5V, not to exceed apeak of +5.5V.A logic zero (low) signal is defined as avoltage in the range of 0.0V to 0.4V, not toexceed a peak negative voltage of -0.5V.However for received signals a voltage of upto +0.8V is recognised as a logic zero.CurrentrequirementsThe printer interface sources up to -15 ma at+2.4V for a high output signal and sinks upto 14 ma for a low output.74LS374 ICs are used for data receivers with1K ohm pull-up resistors, and 74LS244 ICsare used as drivers for Acknowledge, Busy,Select, etc.Data rates The 4213 supports burst data rates of up to50 Kbytes per second for at least 512 bytes.Dataproducts 2260Select the Dataproducts parallel interfaceThe Dataproducts parallel interface is selected through the UserInterface.1. Press the Online H button.2. Press the Menu A button.3. Press the Last Page C button until HOST INTERFACE appears.XEROX 4213 LASER PRINTER PROGRAMMER REFERENCE 1-7
