Lexmark Printer User Manual page 347

Table 8-1: Parallel Connector Pin Assignments (Continued)
Pin
Signal
18 N/A VCC
N/A 18 HOST LOGIC HIGH
19–30 19–35 GND
31 14 INIT*
signal is active when
low
32 4 ERROR*
Inverted logic: signal
is active when low
33–35 N/A LOGIC GROUND
36 16 SLCTIN*
signal is active when
low
N/A 36 PERIPHERAL
LOGIC HIGH
N/A means non-applicable.
Direction Description
300 mA of 5 V +/ - 5%
In Driven by the host.
Return These pins are grounded signals used as twisted pairs with the data and
control signals. GND is often called a logic ground, and a fusible link
isolates it from chassis ground to offset any large ground shifts when the
printer and computer are on different circuits.
In The rising edge of a negative pulse on this line causes the printer to
initialize. The printer synchronizes this function with the received data.
On the falling edge of INIT*, the printer drives the BUSY interface signal
active. On the rising edge of INIT*, the printer:
• Prints all received data
• Displays RESET
• Initializes
• Deactivates the BUSY signal
To disable INIT* processing, set
operator panel or through MarkVision Professional. Refer to your printer
user documentation for more information.
Out This signal indicates a printer error condition. The signal level becomes
low when the printer is:
• In paper exception status
• Not ready because of an operator panel command to stop
• Not ready because of a software command to stop
• Not ready because of a software command for manual feed
This signal is activated approximately 5 seconds after one of the above
conditions sets BUSY.
Not used.
In Set low by host computer to select printer.
Out Driven by the printer.
8-10
Interfaces
Honor Init Off
to from the printer