Install Manual Part 2

SKY497
Installation Manual
2-20
Rev. C
2.6.5 ARINC 429 Data Cables
ARINC 429 Data Input Cable. The two ARINC 429 receivers can be used to input data from other avionics
systems. The following labels are supported:
LABEL FUNCTION
164 Radio Altimeter (see note)
203 Barometric Altitude (Uncorrected)
320 Magnetic Heading
NOTE
The radio altimeter must provide full range output between 0 and 2500 feet. Not all
altimeters provide this full range output. The full range output can sometimes be
obtained as a mod to the radio altimeter. Check with the specific altimeter
manufacturer for compatibility and availability of modification, if necessary.
Data can be input at either low speed (12.5 kHz) or high speed (100 kHz). Both transmitters (data sources)
must be set to the same speed. The TRC will automatically adjust both receivers to the speed of the first
detected incoming data.
The TRC can only accept Radio Altimeter input from ARINC 429 source. The Barometric Altitude can be
ARINC 429 or Gilham Code. The Magnetic Heading can be ARINC 429, Synchro (XYZ) or Stepper
depending on the configuration pins and interconnect wiring. (See figure 2-2 or 2-3.)
NOTE
If 429 barometric altitude is used, it should be from the same source that is interfaced
with the transponder or it must be at least as accurate as that source, i.e., ± 125 ft.
Once the TRC detects valid ARINC 429 barometric altitude (Label 203) input, it will only use 429 data as a
source. ARINC 429 data cables are #22 AWG (minimum) twisted, shielded cables. Cable runs should be as
short as practicable.
Receiver “1” connection:
ARINC-429 RX 1A -to- P1-45
ARINC-429 RX 1B -to- P1-44
Receiver “2” connection:
ARINC-429 RX 2A -to- P1-43
ARINC-429 RX 2B -to- P1-42
Refer to figure 2-2 or 2-3 for detailed interconnect wiring information. Ground overall shields to the
airframe at the processor end only.
ARINC 429 Output Cable. The ARINC 429 transmitter can be used to output data to an external alternate
display (e.g., weather radar via BFGoodrich Avionics Systems RGC250). The output speed is 100 kHz.
ARINC 429 data cables are #22 AWG (minimum) twisted, shielded cables. Cable runs should be as short as
practicable.
Transmitter connection:
ARINC-429 TX 1A -to- P1-34
ARINC-429 TX 1B -to- P1-33
Refer to figure 2-2 for detailed interconnect wiring information.