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Interconnections
All connections to the AT240 are provided by a single 30 way cable assembly.
AT240 Pin Applications and Colour Code
Pin Number
1
supply voltage 7-36 VDC
2
Digital input 5 (pull-down)
3
GND
4
Digital input 3
5
Digital output 4
6
Digital input 1 – Ignition
7
Digital input 2 – Panic
8
ADC1 (0-5V)
9
Digital input 4
10
GND
11
Digital input 6 (pull-down) – Private mode
12
Digital output 2
13
ADC2 (0-15V)
14
GND
15
GND
16
Digital output 1
17
GND
18
Digital output 5
19
iButton / temperature probe (1-wire)
20
5.0V output (unregulated), 150mA fused
21
SWDIO (SDK users only)
22
SWCLK (SDK users only)
23
Digital output 3
24
3.3V output (regulated), 150mA fused
25
RS232-TX1
26
RS232-TX2
27
RS232-RX1
28
RS232-RX2
29
CANH
30
CANL
Digital Inputs
Digital inputs 1 to 4 are normally low inputs and can be connected directly to 12/24V vehicle
circuits.
Digital inputs 5 and 6 are normally high, for use in pull-down applications. Simply switch to GND
to activate these inputs.
Note: damage may be caused to the AT240 device if a voltage source is applied to digital inputs
5 and 6.
Digital Outputs
The AT240 is capable of switching 5 different loads using digital outputs 1–5, implemented with
MOSFET low-side switches. These must be used to switch the GND side of the load.
Digital outputs 1-5 are capable of handling loads of up to 30V, 0.5A maximum. The digital
output switches are protected by internal fuses, rated at 0.63A. The fuses are not user-
replaceable, and are not covered by warranty, hence any replacements are chargeable. An
external fuse, rated at 0.5A will avoid internal damage to the AT240 device.
Application
Wire Colour
black
brown
red
orange
yellow
green
blue
purple
grey
white
pink
light green
black / white stripe
brown / white stripe
red / white stripe
orange / white stripe
green /white stripe
blue / white stripe
purple / white stripe
red / black stripe
orange / black stripe
yellow / black stripe
green / black stripe
grey / black stripe
pink / black stripe
pink / red stripe
pink / blue stripe
pink / green stripe
light blue
light blue / black stripe