Table 5-3 Gtx 33/330 Discrete Outputs; Table 5-4 Gtx 33/330 Discrete Inputs; Table 5-5 Gtx 33/330 Rs-232 Connections; Discrete Functions - Garmin GTX 330D Maintenance Manual

5.3.3

Discrete Functions

Discrete Outputs
Pin Name
ALTITUDE ALERT ANNUNCIATE*
EXTERNAL SUPPRESSION I/O
*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.
Discrete Inputs
Pin Name
AVIONICS MASTER ON SELECT
EXTERNAL IDENT SELECT*
EXTERNAL STANDBY SELECT*
SQUAT SWITCH IN
TIS CONNECT SELECT*
AUDIO MUTE SELECT*
* INACTIVE: 10 ≤ Vin ≤ 33 VDC or Rin ≥ 100 kΩ (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.
5.3.4 RS-232 Input/Output
Pin Name
RS-232 OUT 1
RS-232 IN 1
RS-232 OUT 2
RS-232 IN 2
190-00734-11
Rev. 6

Table 5-3 GTX 33/330 Discrete Outputs

Pin Number

Table 5-4 GTX 33/330 Discrete Inputs

Pin Number
1
12
13
17
46
47

Table 5-5 GTX 33/330 RS-232 Connections

Pin Number
23
22
25
24
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
I/O
19 Out
31 In/Out
I/O Unit (33X)
In 330 Only
In Both
In Both
In Both
In Both
In Both
I/O
Out
In
Out
In
Unit (33X)
Both
Both
Connector
P3301
P3301
P3301
P3301
P3301
P3301
Unit (33X)
Both
Both
Both
Both
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