Tait TM9300 DMR Installation Manual page 21

Table 3.1 Configuration of hardware links and GPI lines for power-sense options
Power-sense option
13.8V battery power
sense
auxiliary power sense
(ignition sense)
internal power sense
no power sense
a. If LK2M is out and AUX GPIO is not used, R775 (33k) should be placed to ensure that AUX GPI3 does not float
(R775 is not placed by factory default).
b. If LK1M is out and R775 is placed, AUX GPI3 should be driven low as well.
c. If LK 4 is in and R723 is placed, IOP GPIO7 should be driven low as well. (R723 is placed by factory default.)
Table 3.2 Configuration of hardware link LK3M and AUX GPI2 for 'emergency power sense'
External push-button
or toggle switch
required to enter
emergency mode
Yes
No
TM9300/TM9400 Installation Guide
© Tait Limited December 2015
Links Configuration of remaining links and
required use of AUX GPI3 and IOP GPIO7
LK1M in LK2M in:
AUX GPI3 must be left floating.
LK2M out:
AUX GPI3 can be used as GPI
LK4M out IOP GPIO7 can be used as GPIO.
LK2M in LK1M in:
Input line must sink >1mA from
AUX GPI3 (which is pulled to 13.8V by a
Ω
33k resistor). The impedance
between the vehicle ignition signal and
ground must be ≤1k
LK1M out:
Input line must be active high
LK4M out IOP GPIO7 can be used as GPIO.
LK1M out
LK2M out AUX GPI3 can be used as GPI.
LK4M in With LK4M in, the input line must be
c
active high .
LK1M out
LK2M out AUX GPI3 can be used as GPI.
LK4M out IOP GPIO7 can be used as GPIO.
Table 3.2 shows the configuration of 'emergency power sense'.
'Emergency power sense' can be configured with any of the above power
sense options.
Links
Implications on AUX GPI2
required
LK3M in AUX GPI2 must be connected to an
external (hidden) push-button or toggle
switch, which connects it to ground.
LK3M in AUX GPI2 must be left floating
LK3M out AUX GPI2 can be used as GPI.
Power Sense and Connector Power Supply Options
Voltages required
10.8V
a
.
AUX GPI3
AUX GPI3
(active)
ignition-sense tolerant to
3.3V, 5V and 12V
Ω
.
b
.
IOP GPIO7
IOP GPIO7
(active)
ignition-sense tolerant to
3.3V and 5V only
10.8V
Voltages required
0.7V active,
≤
floating inactive
supply 16V
≤ ≤
0.7V off
≤
2.6V high
≥
0.7V off
≤
2.6V high
≥
supply 16V
≤ ≤
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