CONFIGURATION
001-9193-001 Version 1
Page 42 of 48
Sentry 4G 900
TM
User Manual
5.9
I/O Settings
The Sentry 4G router supports the following I/Os:
Ignition Sense
One external digital alarm
See Table 5 for pinout.
J4
Pin
Signal
I/O
Description / specification
1
Ignition
Sense
Input to
Sentry4G
Standard ignition-on signal 1. Pin 1 is the left most pin when looking
directly at the front panel.
Maximum voltage above which Ignition Sense will be detected as
ignition asserted = 9.0V;
Minimum voltage below which Ignition Sense will be detected as
ignition de-asserted = 5.7V.
4
External
Alarm
Input to
Sentry4G
Active low signal. To trigger an alarm, short this signal to V
IN-
using
a low impedance path (100-Ohm max)
For 200ms minimum. Otherwise, leave open or connect to V
IN+.
This
signal can also be driven from a 5V/3.3V TTL/LVTTL or CMOS circuit.
Table 5 - I/O Signal Pinout
