Interface Signals - Printronix L5535 Maintenance Manual

Appendix A
Unit Interface

Interface Signals

The following signals are sent and received between the MC board and the
flash power supply:
Charge
The Charge signal causes the flash capacitor to charge. Charging begins
when this signal is asserted and ends when it is de-asserted.
Flash
The Flash signal lights the flash lamp. The flash lamp lights when this signal is
asserted.
Reset
The Reset signal resets the alarm. The alarm is reset when this signal is
asserted.
Alarm
The Alarm signal indicates that an abnormality has occurred.
When an abnormality occurs within the flash power supply, the supply asserts
the Alarm signal. (The voltage goes high between the collector and the
emitter of the interface circuit driver transistor for the Alarm signal.)
Any of the following abnormalities will cause the alarm signal to be asserted:
•
Abnormality in charge voltage
•
Abnormality in temperature/temperature of resistor for discharge
•
Flash error
•
Charge time late (the required charge voltage was not reached within the
required time)
Charge Status
The Charge status signal indicates that the flash capacitor has finished charging.
When the flash capacitor finishes charging, the flash power supply asserts the
Charge status signal. (The voltage goes high between the collector and the
emitter of the interface circuit driver transistor for the Charge status signal.)
II–226
MC board ⇔ Flash power supply
Signal
Charge (*CHON)
Flash (TRG)
Reset (*RESET)
Alarm (ALARM)
Charge status (*CHOK)
Logic power supply + (V
CC)
Logic power supply – (V
SS)
Drive power supply + (+24V)
Drive power supply – (PG)
Flash voltage control (FLPC)
⇒
⇒
⇒
⇐
⇐
⇒
⇒
⇒
⇒
⇒