Honeywell MK VI - Manual (Page 292)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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6.2.59 Latitude Fine (120) - GPS
Latitude Fine - GPS Source: ARINC 743(A) GPSSU
LABEL (Octal) 120 Units: Degrees Max. Range: +/-0.000172 Deg Approx. LSB: 8.38E -8 Deg
Data Bits: 18 to 28 = 11 + = N/A Sign Bit: 29 Pad Bits: 11 to 17
Transmit Interval (mSec): 1000 Maximum Data Type: 2’s Complement Binary SDI Bits: 9, 10
6.2.60 Longitude Fine (121) - GPS
Longitude Fine - GPS Source: ARINC 743(A) GPSSU
LABEL (Octal) 121 Units: Degrees Max. Range: +/-0.000172 Deg Approx. LSB: 8.38E -8 Deg
Data Bits: 18 to 28 = 11 + = N/A Sign Bit: 29 Pad Bits: 11 to 17
Transmit Interval (mSec): 1000 Maximum Data Type: 2’s Complement Binary SDI Bits: 9, 10
6.2.61 Selected Course (100) - IOC
Selected Course (BNR) Source: IOC
LABEL (Octal) 100 Units: Degrees/180 Max. Range: +/-180 Degrees Approx. LSB: 0.8789 Degrees
Data Bits: 18 to 28 = 11 + = Clockwise from North Sign Bit: 29 Pad Bits: 11 to 17
Transmit Interval (mSec): 100 to 500 Data Type: 2’s Complement Binary SDI Bits: 9, 10
6.2.62 DH/MDA Selected (170) – DAU Scaling
DH/MDA Selected Source: DAU
LABEL (Octal) 170 Units: Feet Max. Range (for DH):
+/-4096 feet Max. Range (for MDA):
+/-16384 feet Approx. LSB: 1 foot
Data Bits (for DH):
17 to 28 = 12 Data Bits (for MDA):
15 to 28 = 14 + = Above Ground Level (ASL) Sign Bit: 29 Pad Bits: 11
Transmit Interval (mSec): 1000 Data Type: 2’s Complement Binary / Discrete SDI Bits: 9, 10
Note: If Signal Displayed bit 13=1, MDA Selected is mapped to bit 14. SSM for this word uses the discrete word format.
6.3 Digital Data, ARINC 575
ARINC 575 data is very similar to the low speed ARINC 429 data described in the previous sections, but is one
generation earlier in the aircraft serial data definition. As such, there is NO SDI Field, and the SIGN/STATUS Matrix for
2’s Complement Binary data is different, and is given below for reference.
SIGN/STATUS Matrix: The number of BITS, and the meaning of these BITS, varies depending on the type of data in
the ARINC 575 word.
ARINC 575 BINARY (BNR) DATA
BIT 31 BIT 30 DEFINITION
0 0 Plus, North, East, Right, To, Above
0 1 Failure Warning
1 0 No Computed Data (NCD)
1 1 Minus, South, West, Left, From, Below
6.3.1 Static Air Temperature (213)
STATIC AIR TEMPERATURE Source: ARINC 575 ADC
LABEL (Octal) 213 Units: Degrees Celsius Max. Range: 512 Degrees C. Approx. LSB: 0.5 Degree
Data Bits: 20 to 29 = 10 + = Above ZERO Sign Bit: Part of SSM Pad Bits: 9 to 19
Transmit Interval (mSec): 500 Maximum Data Type: 2’s Complement Binary SDI Bits: N/A