Crystal Vision
Hardware installation
FTX HD User Manual R1.0
7
13/08/2007
2.2 General purpose interface
The external GPI control lines 'a' to 'f' at the frame remote connectors are provided to
allow remote control and/or remote status indication. The FTX HD has six GPI output
lines assigned for status reporting.
GPI Connections
High (+5V )
Low (less than 1V)
‘a’
Serial digital input present on Input A
No serial digital input present on Input A
‘b’
Serial digital input present on Input B
No serial digital input present on Input A
‘c’
Channel A laser functioning within normal
tolerances
Channel A laser has reached its near end of
life point
‘d’
Channel B laser functioning within normal
tolerances
Channel B laser has reached its near end of
life point
‘e’
Channel A laser operating
Channel A laser shut down
‘f’
Channel B laser operating
Channel B laser shut down
Each GPI output line is pulled up to the frame +5V with a 6k8 Ohm resistor; they are also
protected by a 270 Ohm current limiting series resistor.
