190-00734-11
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Rev. 6
Page 5-19
5.4.4 Discrete Functions
Discrete Outputs
Table 5-9 GTX 3X5/3X5R Discrete Outputs
Pin Name
Pin Number
I/O
Unit (335/345/
335R/345R)
Connector
TRANSPONDER FAIL 1
17
Out
All
J3251
EXTERNAL SUPPRESSION
18
In/Out
All
J3251
REPLY ACTIVE
X
Out
All
J3251/J3252
TRANSPONDER FAIL #2
X
Out
All
J3251/J3252
ALTITUDE ALERT*
X
Out
All
J3251/J3252
EQUIPMENT STATUS
X
Out
All
J3251/J3252
TRAFFIC ALERT
X
Out
345/345R
J3251/J3252
TRAFFIC STANDBY
X
Out
345/345R
J3251
TRAFFIC TEST
X
Out
345/345R
J3251
TCAD SENSITIVITY
X
Out
345/345R
J3251/J3252
* 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.
X Denotes that this discrete output can be configured to any available discrete output pin on either the
J3251 or J3252 connectors. Refer to table 5-10 for a list of configurable output pins.