EN 16603-50-14:2014

This standard specifies a common set of spacecraft onboard electrical interfaces for sensor acquisition and actuator control. The interfaces specified in this standard are the traditional point-to-point interfaces that are commonly used on modern spacecraft.The interfaces specified in this standard include analogue and discrete digital interfaces used for status measurement and control, as wellas point-to-point serial digital interfaces used for digital data acquisition and commanding of devices.This standard specifies:•interface signal identification;•interface signal waveforms;•signal timing requirements;•signal modulation;•voltage levels;•input and output impedance;•overvoltage protection requirements;•bit ordering in digital data words;•cabling requirements where appropriate.This standard does not cover:•connector requirements;•digital data word semantics;•message or block formats and semantics.Connector requirements are not covered because these are normally mission or project specific. The goal of this standard is to establish a single set of definitions for these interfaces and to promote generic implementations that can be re-used throughout different missions. When referred, the present standard is applicable as a complement of the already existing interface standards ANSI/TIA/EIA-422B-1994and ITU-T Recommendation V.11 (Previously “CCITT Recommendation”) – (03/93).Guidance for tailoring of the present standard can be found in Annex A.This Standard may be tailored for the specific characteristics and constraints of a space project in conformance with ECSS S ST-00.