Honeywell MK VI - Manual (Page 296)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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DISPLAY RANGE BIT ASSIGNMENTS DISPLAY MODE BIT ASSIGNMENTS 1
Bits 4 - 7 Range Bits 4 - 7 Range Bits 1-3 Display Mode Displayable
0100 0.5 NM 0110 150 NM 000 STBY NO
0010 1.0 NM 1100 200 NM 001 WX YES
1111 2.5 NM 1010 300 NM 010 MAP NO
1011 5.0 NM 0001 500 NM 011 FLIGHT PLAN NO
1101 10 NM 0101 1000 NM 100 TEST NO
1001 25 NM 0011 2000 NM 101 WX/T YES
1110 50 NM 0000 spare 110 CYC NO
1000 100 NM 0111 spare 111 TRB NO
1 Display Mode used for “bolt-on” EDZ displays only.
6.5.1.2 Serial Control Interface (SCI) Status Word 1 (FF)
Status Word 1 Source: Map Electronics Unit (MEU)
LABEL (Hex) FF Units: N/A Max. Range: N/A Approx. LSB: N/A
Data Bit: 1 – 8 + = N/A Sign Bit: N/A Pad Bits: N/A
Transmit Interval (mSec): See above Data Type: Discrete SDI Bits: N/A
STATUS WORD BIT ASSIGNMENTS
BIT DEFINITION
1 SECTOR SCAN *
2 TARGET ENABLE
3 P-450
4 ERASE
5 VAR GAIN
6 SLAVE
7 RIGHT
8 0
(Always zero in data word)
* Sector Scan used for “bolt-on” EDZ displays only.
6.5.2 Honeywell RS-232 Serial Control Interface for DC811 Up/Down Range
The DC811 controller transmits a 6 byte data packet with spacing between bytes of 16.67 mSec. Each byte consists of one
start bit (low), 8 data bits with least significant bit (LSB) first; an EVEN parity bit and one stop bit (high). The LSB of the
first packet byte is set to 1 to indicate the start of the packet (the other 5 bytes will have the LSB set to 0). The data rate for
this bus is 7.8125 KBS
± 0.01%. Depressing the Up or Down Range button will cause an Up or Down Range bit to be set
for 1 packet period (approximately 100 mSec). After an Up or Down transition no additional changes will be allowed for
approximately ½ second.
DC811 Data Packet
EGPWS Up/Down Ranges Supported
in Nautical Miles
BYTE BIT DESCRIPTION 2.5
1 0 1=Start of packet flag 5
2 10
3 25*
4 6 1=Range increment 50
5 1 1=Range decrement 100
6 * (default on power up)