System Description

System Description and Installation Manual for MXS ICD10004-01
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2. Acknowledge Message: Type 0x80
The Acknowledge Message (ACK) is sent by the MXS to indicate that a message was received in the correct format and
with valid data. The MXS performs range checking on all incoming data. If any data is invalid the message is ignored and
the MXS does not ACK. This message:
 Is sent after every receipt of a valid message.
 Contains MXS status information.
 Contains the current altitude being used by the MXS
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.
Note: When a data reply is required, the ACK is sent first followed by the data reply.
An overview of the Acknowledge Message is shown in Table 0-26Table 6-28. Table 0-27Table 6-29 provides the
detailed message definition. An example of the Acknowledge Message is found in Table 0-28Table 6-30.
Table 0-2628 Acknowledge Message Payload Structure Overview
Payload Index Message Field Number bytes
00
ACK’d Message Type
1
01
ACK’d Message ID
1
02
System State Byte
1
03
Pressure Altitude
3
Table 0-2729 Acknowledge Message Payload Structure Overview
ACK’d Message Type
Byte Offset
Byte
Name
Field Description
00
AMT0
AMT0 ACK’d Message Type
0x01
0x02
0x03
0x04
0x05
0x06-0A
0x0B
0x0C
0x0D
Installation Message
Flight ID Message
Operating Message
GPS Navigation Data Message
Data Request Message
Reserved
Target Request Message
Mode Message
Reserved for future use: Air-Initiated Comm-B Message
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The MXS can be configured to either (a) use the integrated altitude encoder or (b) use an external altitude source at
the user’s discretion (Sagetech recommends use of the integrated altitude encoder). The MXS always provides the data
from the current altitude source as part of the ACK message.