190-00734-11
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Rev. 6
Page 5-13
5.3.3 Discrete Functions
Discrete Outputs
Table 5-3 GTX 33/330 Discrete Outputs
Discrete Inputs
Table 5-4 GTX 33/330 Discrete Inputs
5.3.4 RS-232 Input/Output
Table 5-5 GTX 33/330 RS-232 Connections
Pin Name
Pin Number
I/O
Unit (33X)
ALTITUDE ALERT ANNUNCIATE*
19
Out
Both
EXTERNAL SUPPRESSION I/O
31
In/Out
Both
*This output is considered active if either the voltage to ground is < 1.9 V or the resistance to ground is
< 375
Ω
. This output is considered inactive if the voltage to ground is 11-33 Vdc.
Pin Name
Pin Number
I/O
Unit (33X)
Connector
AVIONICS MASTER ON SELECT
1
In
330 Only
P3301
EXTERNAL IDENT SELECT*
12
In
Both
P3301
EXTERNAL STANDBY SELECT*
13
In
Both
P3301
SQUAT SWITCH IN
17
In
Both
P3301
TIS CONNECT SELECT*
46
In
Both
P3301
AUDIO MUTE SELECT*
47
In
Both
P3301
* INACTIVE: 10
≤
Vin
≤
33 VDC or Rin
≥
100 k
Ω
(Open)
ACTIVE: Vin
≤
1.9 VDC with
≥
75 uA sink current, or Rin
≤
375
Ω
(GND)
Sink current is internally limited to 200 uA max for a grounded input.
Pin Name
Pin Number
I/O
Unit (33X)
RS-232 OUT 1
23
Out
Both
RS-232 IN 1
22
In
Both
RS-232 OUT 2
25
Out
Both
RS-232 IN 2
24
In
Both
