190-01499-10
GTX 35R/45R Installation Manual (Non-Certified Aircraft)
Rev. 1
Page 5-7
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.
Table 5-6 Discrete Inputs and Outputs
Pin Name
Connector
Pin
I/O
EXTERNAL STANDBY SELECT*
P3251
14
I
XPDR FAIL 1*
P3251
17
O
EXTERNAL IDENT SELECT*
P3251
36
I
TIS-A SELECT (GTX 35R only)*
P3251
15
I/O
