ESAHomeSpace EngineeringElectrical
About Us
Onboard Computer and Data HandlingOverview of the Workshops and conferencesContact Us
Avionics Data Handling
Architectures of Onboard Data SystemsDependability
Onboard Computers and related modules
Onboard ComputersOnboard StorageRemote Terminal UnitsTelemetry & Telecommand
Building Blocks
MicroprocessorsMicrocontrollersIP CoresSystems on Chip (SoC)Protection of ElectronicsSensing, I/O and instrumentationSecurityOther processing units
Onboard Communication and Interfaces
Overview CommunicationsMil-STD-1553CAN - Controller Area Network BusSpaceWireDiscrete InterfacesI2CSPI - Serial Peripheral InterconnectDigital Sensor BusWireless network technologiesTime-Triggered EthernetCommunication ProtocolsOther Communication Systems
Testing and Benchmarking
RASTA - The Avionics TestbenchMIL-STD-1553 TestbenchSSIART - Smart Sensor Inter-Agencies Reference TestbenchVenus Express Mock-up
printer friendly page
Serial digital interfaces
The serial digital interfaces are used to exchange digital data words between core and peripheral elements. The interface timing and clocking signals are controlled by the core element. A serial digital interface which reads data from the peripheral element into the core element is called an input serial digital (ISD) interface. A serial digital interface which writes data out from the core element to the peripheral element is called an output serial digital (OSD) interface. A third class of serial digital interface is also introduced in this standard, namely the bi‐directional serial digital (BSD) interface.

For space applications, serial digital interfaces shall be implemented in balanced differential form. In this form each signal is carried by a pair of conductors and the level of the signal is determined by the differential voltage between those conductors.

Last update: 21 March 2012

More information
Discrete InterfacesAnalogue signal interfacesAnalogue Signal Monitor Interface (ASM)Temperature Sensors Monitor (TMS) interfaceBi-level Discrete Monitor (BSM) interfaceBi-level Switch Monitor (BSM) interfacePulsed Command Interfaces and High Power Command (HPC) interfaceLow Power Command (LPC) interface
   Copyright 2000 - 2014 © European Space Agency. All rights reserved.