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This TC instruction allows to re-enable the command encoder after the « Locked-out » flag has been set in the
TCU monitoring table. It is the case when:
3.5.1.7. "NOP" Instruction
This TC instruction may be used for checking the link connectivity with the CORTEX CRT Quantum.
3.5.1.8. "Stop Idling" Instruction
This TC instruction allows to stop idling (idle pattern modulation). Idling will automatically restart upon
transmission of the next TC message or preamble. The « Idle ON/OFF » command, received on the Control port,
is strictly equivalent to the « Stop Idling » instruction.
3.5.1.9. "Group" Instruction
This TC instruction allows to force a deterministic behavior of the CORTEX CRT Quantum timing in the case
where TC flow is received via a WAN with unpredictable transmission delays. The group operation specifies the
number of satellite TC requests or/and TC instructions that the CORTEX CRT Quantum should wait for before
beginning the execution of the first one.
Upon receiving a « Group » instruction, the CORTEX CRT Quantum checks (flow ID, Op. Code, Check-sum,...)
and stores in memory all following satellite TC requests or/and TC instructions, up to the specified number. Then,
it acknowledges the « Group » instruction.
If all checks are successful, the satellite TC requests or/and TC instructions in the group are successively
executed and then acknowledged.
Should any satellite TC request or/and TC instruction in the group be corrupted, the TC encoder will return the
Telecommand Client a negative acknowledgement message for the « Group » instruction as well as for each
elementary satellite TC request or/and TC instruction, and then discard all of the satellite TC requests or/and TC
instructions stored in memory.
Should a new « Group » instruction be issued by the Telecommand Client before all satellite TC requests or/and
TC instructions associated to the current « Group » instruction have been received, the current « Group »
instruction is aborted (satellite TC requests or/and TC instructions already stored in memory are discarded and a
negative acknowledgement message is returned to the Telecommand Client for each of them) while the new «
Group » instruction is accepted and restarts the storage process.
3.5.1.10."Data + Execute" Instruction
The « Data+Execute » Satellite TC request is a high-level TC request for sending data and Execute pulses to the
spacecraft.
Satellite TC Requests and Instructions Sequencing
3.5.2.
Next figure shows how the TC requests and instructions are processed (reception over the LAN, modulation by
the TCU and acknowledgement message transmission over the LAN).
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
An « Abort all Pending TC Operations » command is received on the Control port,
A « Wait & Verify » instruction fails,
This document is the property of
It cannot be duplicated or distributed without expressed written consent.
Safran Data Systems
.
Ref.
DTU 100042
Is.Rev.
5.17
Date:
Dec.
03, 2021Sept. 30, 2021
Page 135
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