Printronix PrintNet Enterprise - Manual (Page 210)

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Chapter 6 Events and Actions
Events and Actions
GPIO operation is based on Events and Actions. Events can be either printer
internal such as paper out or print complete, or they can be printer external
such as opto-coupler 1 active. Actions are the result of an event and can be
printer internal such as paper feed or printer external such as relay 1 active or
reply to host where data is transmitted over the serial, parallel, or network
interface. You can also define a number of events to be acted upon without
the GPIO card installed in the printer and allow the printer to be adapted for
the application in use.
The Hardware
The GPIO hardware (Figure 180) consists of 16 opto-couplers, 4 SPDT
relays, and the logic required to connect this hardware into the printing
system.
Eight of the 16 opto-couplers are used as isolated inputs; these are the
connections on which the external events happen. The remaining eight
opto-couplers and the four SPDT relays are used as isolated outputs. Each of
these outputs can be designated as an action in response to some event. The
board is connected into the printing system through the printer’s PCI bus.
None of the inputs or outputs is connected to any voltage source; it is the
user’s responsibility to make those connections. A separately fused 5 volt and
a separately fused 24 volt are available on the 50 pin connector in which all
inputs and outputs are terminated.
Figure 180. GPIO Hardware
GPIO
Logic
Outputs 1 . . 8
System Interface
Relay 1 . . 4
Inputs 1 . . 8