Product Manual

Product Manual for Tornado Radio Unit
47
• Where Vmax is the maximum voltage that will be measured, 109k is the input impedance, and Rext is an
external series resister between the voltage being measured and the tornado GPIO pin. Remember to
round the resister value up to the nearest resistor value above the calculated value.
• Next use the GPIO input calibration process to calibrate the system through the external resistor. This
process will be based on a known voltage before the resistor.
GPIO Input Circuit
GPIO as digital output:
• The GPIO pins provide an open collector output, which can be used to drive a relay or generate a level.
The current can be up to 100 mA.
GPIO Output Circuit
Signal Name
Pin number
Colour on Mimomax cable
Not Connected
1
n/a
Ext Ref n
2
Brown
Ext Ref p
3
Red
GPIO Ground (Radio Ground)
4
Orange
GPIO_4
5
Yellow
GPIO_3
6
Green
GPIO_2
7
Blue
GPIO_1
8
Violet
Open in Alarm
9
Grey
Alarm Comm
10
White
Closed in Alarm
11
Black
Not Connected
12
n/a