FARGO electronic Maestro 900 - Manual (Page 19)

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5. I/O TRIGGERED AT COMMAND
This feature making use of the Fargo Maestro Input/Output port as a sensor. If the signal to the port
match the pre-defined condition a stored AT command will be executed.
User can use AT+IOAT command to set the condition and store AT command to be executed.
5.1 Description of the operation
Wiring Diagram :
1. When the I/O port is connected to high 3V signal,
Switch closed : logic level high
Switch opened : logic level low.
2. The switch can be placed as a triggering device, e.g. to detect door opening.
3. According to the setting of AT+IOAT command, the stored AT command will be executed either
I/O signal from high to low, or from low to high :
When set as low-to-high triggering:
I/O port
I/O port volatge
time = T
Start counting time when
a low to high signal
changed detected when period of high signal
reach the Threshold value
the AT command will be
executed