190-01115-01
G3X/G3X Touch Installation Manual - LRU Pinouts
Rev. AC
Page 25-76
25.16.11 TX Interlock
TX Interlock Out is an active low output that indicates that this radio’s (GTR 20) COM is transmitting.
Connect to another COM’s TX Interlock input. TX INTERLOCK OUT will sink 20mA of current and
will output a voltage of 1V or less.
TX Interlock In is an active low input that desenses (protects) the COM receiver when another COM is
transmitting.
TX Interlock In is considered active if either the voltage to ground is
≤
3.5 VDC or the resistance to ground
is
≤
375
.
TX Interlock In is considered inactive if the voltage to ground is 6.5-33 VDC or the resistance to ground is
>100 k
.
25.16.12 Discrete Inputs
These discrete inputs are active low and are configurable.
See
when configuring the GTR 20 as the intercom, the configuration options are: None,
Frequency Swap, Pilot Intercom Key, and Copilot Intercom Key. When configuring the GTR 20, but not
as the intercom, the options are: None and Frequency Swap (
).
Active-Low discrete inputs are considered active if either the voltage to ground is
≤
3.5 VDC or the
resistance to ground is
≤
375 W.
These inputs are considered inactive if the voltage to ground is 6.5-33 VDC or the resistance to ground is
>100 kW.
Pin Name
Pin
I/O
TX INTERLOCK OUT
4
Out
TX INTERLOCK IN*
5
In
*Indicates Active Low
Pin Name
Pin
I/O
DISC 1*
2
In
DISC 2*
22
In
*Indicates Active Low