Discrete I/O - Garmin GTX 45R Installation Manual

5.5

Discrete I/O

Active-Low discrete inputs are considered active if either the voltage to ground is <3.5 VDC or the
resistance to ground is <375 ohms. These inputs are considered inactive if the voltage to ground is 6.5-33
VDC or the resistance to ground is >100 kilohm.
Each is an open drain output capable of sinking 250 milliamp when active.
EXTERNAL STANDBY SELECT*
XPDR FAIL 1*
EXTERNAL IDENT SELECT*
TIS-A SELECT (GTX 35R only)*
190-01499-10
Rev. 1
Table 5-6 Discrete Inputs and Outputs
Pin Name
GTX 35R/45R Installation Manual (Non-Certified Aircraft)
Connector Pin
P3251 14
P3251 17
P3251 36
P3251 15
I/O
I
O
I
I/O
Page 5-7