Xerox 4213 - Manual (Page 29)

INTERFACES
Table 1-3 describes Centronics interface voltage and current
requirements
Table 1-3. Centronics interface voltage and current
requirements
Voltage levels 0 (zero) and +5 VDC (nominal), TTl (SN
74LS00 series
Logic levels Positive logic is assumed. A logic one
(high) signal is defined as a voltage in the
range of +2.4V to +5V, not to exceed a
peak of +5.5V.
A logic zero (low) signal is defined as a
voltage in the range of 0.0V to 0.4V, not to
exceed a peak negative voltage of -0.5V.
However for received signals a voltage of up
to +0.8V is recognised as a logic zero.
Current
requirements The printer interface sources up to -15 ma at
+2.4V for a high output signal and sinks up
to 14 ma for a low output.
74LS374 ICs are used for data receivers with
1K ohm pull-up resistors, and 74LS244 ICs
are used as drivers for Acknowledge, Busy,
Select, etc.
Data rates The 4213 supports burst data rates of up to
50 Kbytes per second for at least 512 bytes.
Dataproducts 2260
Select the Dataproducts parallel interface
The Dataproducts parallel interface is selected through the User
Interface.
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