Tait TM8100 Installation Manual page 24

The radio provides four hardware links (LK1 to LK4) on the top-side of the
Hardware Links and
Power-Sense
main board which can be configured to attain different power-sense options.
Options
Table 3.4
for the individual power-sense options. It also lists the dependence of the
power-sense options with respect to the GPI lines, which can or cannot be
used.
Hardware link LK3 is used for 'emergency power sense'.
Table 3.4 Configuration of hardware links for power-sense options
Links
Power-sense option
required
13.8V battery power LK1 in
sense
LK4 out
auxiliary power sense LK2 in
(ignition sense)
LK4 out
internal power sense LK1 out
LK2 out
LK4 in
no power sense LK1 out
LK2 out
LK4 out
1. If LK2 is out and AUX GPIO is not used, R775 (33kΩ) should be placed to ensure that AUX GPI3 does not float
(R775 is not placed by factory default).
2. If LK1 is out and R775 is placed, AUX GPI3 should be driven low as well.
3. If LK 4 is in and R723 is placed, IOP GPIO7 should be driven low as well. (R723 is placed by factory default.)
For more information on hardware links and power-sense options refer to
the service manual.
24 Installing the Radio
shows the configuration of the hardware links LK1, LK2 and LK4
Configuration of remaining links and
use of AUX GPI3 and IOP GPIO7
LK2 in:
AUX GPI3 must be left floating.
LK2 out:
AUX GPI3 can be used as GPI
IOP GPIO7 can be used as GPIO.
LK1 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
Ω
must be ≤1k
.
LK1 out:
Input line must be active high
IOP GPIO7 can be used as GPIO.
AUX GPI3 can be used as GPI.
With LK4 in, the input line must be active
3
high .
AUX GPI3 can be used as GPI.
IOP GPIO7 can be used as GPIO.
Voltages
required
10.8V ≤ supply
1
.
AUX GPI3 ≤ 0.7V off
AUX GPI3 ≥ 2.6V high (active)
ignition-sense tolerant to
3.3V, 5V and 12V
2
.
IOP GPIO7 0.7V off
≤
IOP GPIO7 ≥ 2.6V high
(active)
ignition-sense tolerant to
3.3V and 5V only
10.8V ≤ supply
TM8100/TM8200 Installation Guide
© Tait Limited November 2012
≤ 16V
≤ 16V