System Description
System Description and Installation Manual for MXS ICD10004-01
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6. Data Request Message: Type 0x05
This message is a request for the MXS to send data in a response message. The type of data being requested is specified in
the payload of this message, which consists of a single byte that specifies the response message type. In response to a
valid Data Request Message, the MXS sends an Acknowledge Message immediately followed by a response message.
The structure of the response message depends on the requested message type. See the sections for the specific “Request
Message Type” for details.
An overview of the Data Request Message is shown in Table 0-16Table 6-16. Table 0-17Table 6-17 provides the detailed
message definition. An example of the GPS Navigation Data Message is found in Table 0-18Table 6-18.
Table 0-16 Data Request Message Payload Structure Overview
Payload Index Message Field Number bytes
00
Request Message Type
1
01
Reserved
3
]
Latitude
12129.1248 Degrees [34 35 34 33 2E 36 36 33 32 30 ]
Speed Over Ground
99.00 knots [30 39 39 2E 30 30 ]
Ground Track
180.0000 Degrees [31 38 30 2E 30 30 30 30 ]
Hemisphere/Data
Status
East West Indicator: Longitude is West and latitude is North [01 ]
Time of Fix
12:34:56.789 [31 32 33 34 35 36 2E 37 38 39 ]
Height
2000 meters [00 00 FA 44 ]
HPL
100 meters [00 00 C8 42 ]
HFOM
2 [00 00 00 40 ]
VFOM
3 [00 00 40 40 ]
NAC
V
Unknown or >= 10 m/s [ 00 ]
Checksum
8-bit arithmetic sum of message from Start Byte to last byte of the Payload Data. [F5]