TM / TC Interface Module - Terma
TM / TC Interface Module - Terma
TM / TC Interface Module - Terma
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<strong>TM</strong> / <strong>TC</strong> <strong>Interface</strong> <strong>Module</strong><br />
SPACE<br />
The <strong>TM</strong>/<strong>TC</strong> <strong>Interface</strong> module provides the<br />
communication interface to the spacecraft Data<br />
Management Subsystem (DMS). The module interfaces<br />
to the unit power modules via a local Command &<br />
Monitoring (CM) bus distributed by a backplane module<br />
and can set remote commandable functions and read<br />
the telemetry of system power modules.<br />
Redundant access can be obtained by applying two identical<br />
modules in a power system unit.<br />
The <strong>TM</strong>/<strong>TC</strong> interface module is able to perform the following<br />
tasks:<br />
1. Communicate with DMS, via the ESA Spacecraft Data<br />
Handling <strong>Interface</strong> Standard T<strong>TC</strong>-B-01, issue1.<br />
2. Set or reset of selected functions, when dedicated<br />
commands are received from the DMS via the <strong>TM</strong>/<strong>TC</strong><br />
communication interface.<br />
3. Read and temporarily store telemetry data from power<br />
modules in a predefined format, when requested by<br />
the DMS.<br />
4. Send the acquired <strong>TM</strong> data via the communication<br />
interface when requested by the DMS.<br />
The module forms an autonomy function having its own<br />
internal auxiliary supply that generates its supply voltages<br />
from the present power bus voltage.<br />
<strong>Module</strong> logic functions are implemented in an Actel radiation<br />
tolerant FPGA with Triple Modular Redundancy (<strong>TM</strong>R)<br />
technique applied for all flip-flops in SEU critical functions.<br />
References:<br />
• 4 modules onboard Mars Express and Rosetta, flying<br />
since June 2003 and March 2004.<br />
• 2 modules onboard Venus Express, flying since<br />
November 2005.<br />
Telemetry / Telecommand <strong>Interface</strong> <strong>Module</strong><br />
Space Engineering and Knowledge
Specifications<br />
Dimensions (L x W x H)<br />
Mass<br />
Bus voltage<br />
Power consumption<br />
Communication <strong>Interface</strong><br />
193 x 150 x 24 mm3<br />
350 gram<br />
28 volt<br />
1.1 Watt<br />
ESA <strong>TM</strong>/<strong>TC</strong> I/F T<strong>TC</strong>-B-01<br />
<strong>TM</strong> A/D conversion inaccuracy < 1 %<br />
<strong>TM</strong> A/D resolution<br />
Failure rate<br />
12 bit<br />
< 812 FITS<br />
Instruction PROM<br />
16-bit Instruction<br />
8-bit<br />
Address<br />
<strong>TM</strong> format<br />
select<br />
<strong>TM</strong> bit<br />
placement<br />
select<br />
<strong>TM</strong> Machine<br />
<strong>TM</strong> Format / Go<br />
Command<br />
Interpreter<br />
Write<br />
8-bit<br />
Address<br />
Position<br />
Command ID<br />
DATA<br />
Ready<br />
ESA<br />
ML / <strong>TM</strong><br />
<strong>Interface</strong><br />
DMS<br />
Read<br />
Backplane<br />
Address Bus<br />
Data Bus<br />
Bus Control<br />
Digital <strong>TM</strong><br />
TeleMetry<br />
RAM<br />
Control<br />
Analog <strong>TM</strong><br />
12-bit A/D<br />
Converter<br />
Analog <strong>TM</strong><br />
Telemetry / Telecommand <strong>Interface</strong> <strong>Module</strong> Functional Schematic<br />
<strong>Terma</strong> A/S Space<br />
www.terma.com
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