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Bus Functional Specification Version 4.2
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Digital Satellite Equipment Control (DiSEqC™ )协议,英文版
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This document is provided for information purposes. Whilst every effort has been made to provide accurate information,
no responsibility is taken for errors or omissions. EUTELSAT reserves the right to change this information without notice.
Organisation européenne de télécommunications par satellite
European Telecommunications Satellite Organization
70, rue Balard — 75502 PARIS Cedex 15 — France
February 25, 1998
Digital Satellite Equipment Control (DiSEqC™)
BUS FUNCTIONAL SPECIFICATION
VERSION 4.2
page II February 25, 1998 Buspec42.tit
Bus Functional Specification Version 4.2
Digital Satellite Equipment Control (DiSEqC)
Reference Documents that define the DiSEqC System:
DiSEqC™ Bus Specification Version 4.2 (February 25, 1998)
DiSEqC™ Slave Microcontroller Specification Version 1.0 (February 25, 1998)
DiSEqC™ Logos and Their Conditions of Use (February 25, 1998)
Associated Documents:
Update and Recommendations for Implementation Version 2.1 (February 25, 1998)
Application Information for using a "PIC" Microcontroller in DiSEqC™ LNB and
simple switcher Applications Version 1.0 (June 7, 1999)
Application Information for Tuner-Receiver/IRDs (April 12, 1996)
Application Information for LNBs and Switchers Version 2 (February 25, 1998)
Reset Circuits for the Slave Microcontroller (August 12, 1996)
Simple Tone Burst Detection Circuit (August 12, 1996)
Positioner Application Note Version 1.0 (March 15, 1998)
CONTENTS
page III February 25, 1998 BUSPEC42TDM.fm
Bus Functional Specification Version 4.2
Digital Satellite Equipment Control (DiSEqC)
0. Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
3. Slave device architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
4. Bus Hardware Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
5. Method of Data-Bit Signalling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5.1. Backwards Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5.2. Simple “Tone Burst” Control Signal . . . . . . . . . . . . . . . . . . . . . . . . . .6
5.3. Combined Transmission of DiSEqC and Backwards-Compatible
Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
5.4. Repeated Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
6. Message Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
6.1. Framing (first) byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
6.2. Address (second) byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
6.3. Command (third) byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
6.4. Data (subsequent) bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7. Initialisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
7.1. Power (Standby) Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
7.2. Bus Arbitration (DiSEqC Levels 2.x) . . . . . . . . . . . . . . . . . . . . . . .11
7.3. Bus Collision detection (DiSEqC Levels 2.x). . . . . . . . . . . . . . . . .12
8. Definition of DiSEqC Bus Commands . . . . . . . . . . . . . . . . . . . . . . . . .13
8.1. Framing Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8.2. Address Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
8.3. Command Byte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
9. Description of DiSEqC Bus Commands . . . . . . . . . . . . . . . . . . . . . . . .18
9.1. Write Port Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.2. Write Channel frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
9.3. Positioner Operation and Commands . . . . . . . . . . . . . . . . . . . . . . . . .20
9.4. Write Polariser Skew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
9.5. Read Positioner Status Byte (Level 2.x) . . . . . . . . . . . . . . . . . . . . . .21
9.6. Read Local Oscillator Frequency (Level 2.x). . . . . . . . . . . . . . . . . . .22
9.7. Read Status Byte (Level 2.x). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
9.8. Read Configuration Byte (Level 2.x) . . . . . . . . . . . . . . . . . . . . . . . .23
page IV February 25, 1998 BUSPEC42TDM.fm
Bus Functional Specification Version 4.2
Digital Satellite Equipment Control (DiSEqC)
9.9. Read Committed Switches Byte (Level 2.x) . . . . . . . . . . . . . . . . . . 24
9.10. Read Uncommitted Switches Byte (Level 2.x) . . . . . . . . . . . . . . . . 24
10. Contact details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
page 1 February 25, 1998 BUSPEC42.FRM
Bus Functional Specification Version 4.2
Digital Satellite Equipment Control (DiSEqC)
0. Status
This Specification contains minor corrections and some additions to the
Version 4.1 Specification dated April 18th, 1997. Additions and significant
changes are marked with a vertical revision bar in the left-hand margin. This
version incorporates new commands for DiSEqC Level 1.2, supporting
“one-way” control of motorised Positioners (antenna-movement actuators)
and Polarisers, via the DiSEqC Bus. The original “two-way” Positioner
commands are provisionally withdrawn and eventually will be deleted, or
amended, unless there are requests for their re-instatement.
1. Introduction
This document describes the Functional Specification for the Digital Satellite
Equipment Control (DiSEqC) Bus. DiSEqC is an OPEN STANDARD
with additions controlled by industry agreement.
The DiSEqC system is a communication bus between satellite receivers and
satellite peripheral equipment, using only the existing coaxial cable.
DiSEqC can be integrated into consumer satellite installations to replace all
conventional analogue (voltage, tone or pulse width) switching and all other
control wiring. A “Universal” Slave IC supports multiple applications by
link-configuration to identify the peripheral hardware that it is controlling.
The main advantages of DiSEqC are:
n standardised digital system with non-proprietary commands
n enables switching in multi-satellite installations
n backwards compatible with 13/18 volt and 22 kHz tone switching
n potential for reduced power dissipation and thus cost reduction and
improved reliability
n elimination of switching problems caused by incompatibility of system
components
n easier receiver installation using device recognition via optional two-way
communication
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