190-00906-01
GTX 23 Installation Manual
Rev. C
Page 4-4
4.2.2 Discrete Inputs
Sink current is internally limited to 200 uA max for a grounded input
EXTERNAL IDENT SELECT (remote IDENT) is a momentary input. When grounded, it activates the
IDENT pulse for 18 seconds in Mode A replies.
EXTERNAL STANDBY SELECT (remote STANDBY) is not a momentary input. When EXTERNAL
STANDBY SELECT is grounded, the GTX 23 operates in standby mode. In this mode, the transponder
will not squitter or reply to interrogations.
TIS CONNECT SELECT is a momentary input. When grounded, it toggles whether TIS is in standby or
operating.
Table 4-4 Discrete Inputs
Pin Name
Connector
Pin
I/O
EXTERNAL IDENT SELECT*
P2301
12
In
EXTERNAL STANDBY SELECT*
P2301
13
In
TIS CONNECT SELECT
P2301
46
In
*Inactive State: 10
Vin
33Vdc or Rin
100k
Ω
, Active State: Vin
1.9Vdc with
75 uA sink current,
or Rin
375
Ω
