REVUE THOMMEN AG
CH-4437 Waldenburg
AD20 Standby Altimeter
Page 48 of 72
07-Sep-2009 Document No: AD-INSOP-800 Revision: 1.6
4.1.6 Digital Data Interface
4.1.6.1 ARINC 429 (optional)
4.1.6.1.1 ARINC 429 Data bus Interface
Digital Data Standards are acc. to ARINC 429 Mark 33 DITS and ARINC 706 ADS
Label Signal Name Unit Resolution Update Rate Transfer
203 Altitude (1013.25 hPa) feet 1 16 Output
204 Baro Corrected Altitude #1 feet 1 16 Output
212 Altitude Rate ft/min. 16 16 Output
217 Static Pressure inHg 0.0009765 8 Output
234 Baro Correction mb #1 hPa 0.1 8 Output
235 Baro Correction inHg #1 inHg 0.001 8 Output
270 Discrete Word #1 -- -- 2 Output
350 Maintenance Word #1 -- -- 2 Output
Table 4-3 ARINC 429 Data Bus Interface
Operational ranges are defined to meet customer requirements.
4.1.6.1.2 ARINC 429 BIT Rate
The ARINC 429 data bus is designed for:
• High Speed: 100 kbits/s, half load (max. 16 receivers) for both transmit channels
Optionally it can be configured for:
• Low Speed : 12.5 kbits/s, full load (max. 32 receivers) for both transmit channels
4.1.6.1.3 ARINC Label Formats
Format according to ARINC 429 Mark 33 DITS, equipment ID 006 (Air Data System)
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