System Description
System Description and Installation Manual for MXS ICD10004-01
© Sagetech Corporation 2018 Confidential Proprietary Export-Controlled Page 143 of 160
15. Use Case Scenarios
Users interfacing with the MXS can follow these Use Cases to perform common operations.
1. Power On
Upon power-up, the power-on Built-in-Test is executed and the Status Response message is sent. The Host Computer uses the status message to assess the state
of the MXS to determine the next operational state. The following steps outline a typical Power-On process and command sequence.
1. The Wake-up Built-in-Test (BIT) is executed once when the MXS is powered on and power is stable.
2. After the power-on BIT is executed, the Host should send the Data Request Message to request the Status Response Message. The Host should then review
the results of the BITs provided in the Status Response Message to confirm that the MXS is Operational.
3. If MXS is Operational, jump to the Operational Use Case (Section 36.5.3).
4. If the Status Message indicates an ICAO Address failure but is otherwise functional, jump to the Installation Use Case (Section 26.5.2).
5. If the Status Message indicates a failure, Host Computer should log the failure and take appropriate remedial action.
Step Message Msg
Direction
FieldName DataValues
(Hex)
Data/FunctionalDescription SDIM
Section
1
Construct and send a Data Request Message requesting MXS Status to determine health of MXS.
DataRequest
Sentfrom
Host
StartByte [AA] 13.66.3.6
MessageType [05]
MessageID [00]
PacketLength [04]
RequestMessageType [83] MessageType=StatusResponseMessage.TheACKMessagewillbereturnedfirst
followedbytheStatusResponseMessage.
Reserved [000000]
Checksum [36]
2
Receive and decode Acknowledge Message (ACK)
Acknowledge Receivedby
Host
StartByte [AA] 14.26.4.2
MessType [80]
MessID [00]
PacketLen [05]
Ack’dMessType [05] AcknowledgementofDataRequestMessage
SystemState [28] MXSisinSTBYmode,hasdetectedasystemfailureduetolackofGPSdata,ICAO
addressisallzerosorallones,andExtendedSquittersarenotbeinggenerated.GPS
DataandExtendedSquitterfailuresaretobeexpecteduntilMXSisinitializedwith
OperatingandGPSDataMessages.LikelycauseoftheICAOaddressfailureislackof