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The GPIO (General Purpose Input Output) connector located on the input panel provides a
flexible method of interfacing a wide range of external I/O devices to the projector. There are
seven GIO pins available on the nine-pin D-Sub GPIO connector, which are configurable via
RS232 commands. The other two pins are reserved for ground and power – see table below for
pin identification.
gPIo Pins
gPIo
Pin #
signal
1
+ 12V (1200mA)
2
GPIO 1
3
GPIO 2
4
GPIO 3
5
Ground
6
GPIO 4
7
GPIO 5
8
GPIO 6
9
GPIO 7
ConfIgURIng The gPIo
The GPIO connector can be configured to automate any number of events using the serial
command code GIO. Each pin is defined as either an input or output depending on the
desired outcome. In general, configure the pin as an input if you want the projector to
respond to something the external device does and as an output if you want the external
device to respond to an action taken by the projector. For example, configure the pin as an
output if you want the lighting in a room to automatically dim when the projector is turned
on.
By using the GIO command, you can also set the state of each pin as high or low. By default,
the state of each pin is high. The voltage applied to pins in the high state is + 3.3V.
example 1.
Turn room lighting on when the projector is turned off.
(Assumes a control/
automation unit is configured to turn the lights on when pin 2 of its input goes high.)
(GIO C2 O)
Set pin #2 configuration to output
(GIO 2 H)
Set pin #2 to high (state)
Query Command
(GIO?)
Request the state and configuration of all pins
(GIO! “HHLLHLH” “OOIOOOI”)
Reply of pin state and configuration
(GIO? C2)
Request configuration for pin #2
(GIO! C2 O)
Reply with pin #2 configuration as output
(GIO? 2)
Request the state of pin #2
(GIO! H)
Reply with pin #2 state as high
The serial cable required for connecting
the external device to the projector’s GPIO
connector, whether it’s a standard serial cable
or a custom one, must be compatible with the
external device.
