EFD1000 E5 Dual Electronic Flight Instrument (EFI) Install Manual
DOCUMENT # 900-00041-001 PAGE 93-226 REVISION D
© Copyright 2019 Aspen Avionics Inc.
8.2.5.11 GPS Selected Output
Active low discrete output indicating GPS1 or GPS2 is the current coupled sensor on the
HSI.
GPS coupled: ................. Sinks to ground
GPS not coupled: ........... Open
Load Current: ................ 100ma maximum
8.2.5.12 ARINC 429 Output
The ACU transmits the following labels on P3 pins 4 and 5 for GPS receivers and
systems that require ARINC 429 magnetic heading and selected course.
Note- Except as shown in the wiring diagrams (Section 9) no ARINC 429 interface is
approved under the Aspen STC, and must be approved separately.
Table 8-8: ACU A429 Output
8.3 ACU2 Electrical Specifications (910-00004-10x only)
The ACU2 has the same interfaces as the ACU above on connectors J1/J2/J3 plus it adds the
following interfaces on connector J4.
8.3.1 Heading Synchro Out
The ACU2 will output a heading synchro (bootstrap) signal per ARINC 407 to external
equipment.
Heading Reference In:
Input Range: ...................... 17Vac to 30Vac
Frequency Range: .............. 300Hz to 5500Hz
Load: ................................. at least 68100 ohm
Heading Reference Out:
Output Voltage: ................. 17Vac to 30Vac (26Vrms nominal) into a 10000 ohm load
Frequency Range: .............. 350Hz to 450Hz
Load: ................................. 10000 ohm
Synchro Output:
Output Format: .................. V
X-z
= V
Ref
sin(Ө - 120⁰)
V
Y-Z
= V
Ref
sin(Ө + 120⁰)
Output Range: ................... 0 to 11.8Vrms
The ACU2 will disable the heading reference output when an external reference of greater
than 18Vac is applied across pins 26V-REF-H and 26V-REF-C.
Heading Valid:
Open Collector output to the heading valid flag. It can sink up to 100mA to ground at
28Vdc.
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