Engineering CenterFive Farm SpringsFarmington, CT 06032Original Date: 2005-10-24 Document: SID00022 Project Number: C867 PC Number:Sheet 1 of 16Dwg / Part No:Remote Serial Link (RSL) Protocol Interface StandardDISTRIBUTION:Per notification document 53627.ORIGINAL APPROVAL:Prepared By:(Last, F I typed) (Signature and date) Approved By:(Last, F I typed) (Signature and date)Lerner, Bruce Bruce Lerner 2005-10-24 Leach, R. B. Bryan Leach 10/24/05Hoopes, Bruce Bruce Hoopes 2/15/06Vela, Haran Haran Vela 10/24/05 REVISION APPROVAL RECORD:Rev Date (yyyy-mm-dd) Project/PCRevised By:(Last, F I typed)Approved By:(Last, F I typed) (Signature and date)This work and the information it contains are the property of Otis Elevator Company (“Otis”). It is delivered to others on the express condition that it will be used only for, or on behalf of, Otis; that neither it nor the information it contains will be reproduced or disclosed, in whole or in part, without the prior written consent of Otis; and that on demand it and any copies will be promptly returned to Otis.Table of Contents1 Introduction (4)1.1 Purpose (4)1.2 Overview (4)1.3 Referenced Documents (4)2 RSL Overview (5)2.1 Communication Context (5)2.2 Otis RSL Protocol Mapping to the 7-layer ISO model (5)3 Otis RSL Functionality (6)4 OSI Layer 1: – RSL Physical (6)4.1 RSL Physical layer (6)4.1.1 Signal levels (6)4.1.2 Power levels (6)4.1.3 Bit Representation (6)4.1.4 Transmission Medium (6)4.1.5 Connectors (7)5 OSI Layer 2: – RSL Link (7)5.1 Frames (7)5.2 Data Cycles (Master Station driven) (8)5.2.1 Synchronization Cycle (8)5.2.2 Write Cycle (8)5.2.3 Read Cycle (8)5.3 Frame Timing (8)5.4 Error Detection (8)6 OSI Layers 3 – 6: Not Supported (9)7 OSI Layer 7 (9)7.1 Basic RSL Data format (9)7.1.1 Master Write /Slave Read (9)7.1.2 Master Read /Slave Write (9)7.2 CPI-11 / New Europa Line (NEL) RSL Data format (9)7.2.1 ELD Frames (9)7.2.2 7 & 16 Segment LCD Character Bit-maps (11)7.2.3 7 & 16 bit LCD Character Code list (12)7.2.4 ELD Frame Description (13)7.2.5 ELD Commands (14)7.3 Global Aesthetics RSL Data format (15)7.3.1 Frame 0 (15)7.3.2 Frame 1 (15)Appendix (16)APPENDIX A Definitions and Acronyms (16)1 Introduction1.1 PurposeThis document describes Otis’ application of the Remote Serial Link (RSL) within the Elevator system. This document should serve as a reference for creating modules that communicate using the RSL protocol. This document is meant to be referenced by multiple Module SIDs and does not intend to capture Module specific information.Any Module or Message specific information found in this document are examples and should not be construed as a definition of a standard for a Module or Message.This document will be updated when the RSL protocol standard or Otis’ application of RSL is amended, following approval by the Interface Change Control Board.1.2 OverviewThis document has been divided into the following sections and subsections. The combined information in these sections provides a complete description of Otis’ application of the RSL protocol.! Protocol Descriptiono The protocol description is an introduction to the Otis RSL Protocol and its expected functionality in relation to commercial protocol standards, primarily the 7-layer OSI standard.! Functional Allocationo This section specifies the functions that are supported by the interface. The functions in this section support or interact with functionality in other modules. The interface requirements aregenerally driven by the cross-module functional interactions.! Appendixo List of Acronyms and Definitions.o List of references that may be useful in understanding this document or its history.1.3 Referenced Documents[1] “System Architecture Interface Standard”, Otis Elevator Company, 2005. Document # SID00000.[2] “Signalling Subsystem Basic Data”, Flohr Ois Engineering, Otis Elevator Company, 8-September-1987.[3] Gewinner, J “Remote Station Family A9693 C1, C2, C3, C4 Basic Data”, Version 1.0, Flohr Otis,Berlin, 26-Feb-1988.[4] Shull, J “Industrial Control Unit Integrated Circuit Design Specification”, Revision 8, Otis ElevatorCompany, July 25, 1988.[5] Schulte, J “CPI11 ELD for OTIS2000 - Serial Protocol Definition”, Otis Elevator Company, Europeanand Transcontinental Operations, Berlin. Document # GAA25250B_BD1, 1994-03-03.[6] Drop, D “RSL Global Aesthetics Generic Fixtures Serial Protocol Description”, Otis ElevatorCompany, 2000-11-17, Document # 54723.2 RSL OverviewThis section describes the mapping of Otis’ application of RSL to the OSI model.This Remote Serial Link is a low-cost 4-wire bus that is intended for use in a single master – multiple slaves (I/O devices) configuration. Information is transferred as a continuous 64 frames of 5 bits each. The four wires applied by RSL between a master device and a slave device, are arranged as two pairs of wires, one providing communication, the other pair providing power. All stations on the RSL are connected in parallel. The RSL master provides synchronization for the read/write data transfer.The RSL is used as a long distance (hoistway length) communication channel for fixtures and bit-oriented inputs and outputs.2.1 Communication ContextRSL is being applied as one of the communication protocols in the elevator control system communication architecture. See reference [1].2.2 Otis RSL Protocol Mapping to the 7-layer ISO modelThis diagram maps the implemented layering for the RSL Protocol to the industry standard ISO 7-layer model.OSI Reference Model OSI-RMDefintionOtisLayersOtis Application Comm.Term7. Application Application-to-applicationcommunicationApplicationBit Mapping for: Basic RSL,CPI11/NEL and Global AestheticsProtocolData Unit(PDU)76. Presentation ConvertEncryptCompressPresentation65. Session EstablishManageTerminate54. Transport Error recover,Flow control Segment43. Network Determine path RouteN/APacket32. Link Media AccessControl,Framing errorLink RSL Frame21. Physical Transmit raw bitsPhysical RSL Bits13 Otis RSL FunctionalityThe Otis RSL protocol interface standard describes the mechanism for bit-oriented input and output betweenRSL slave stations and an RSL master station, and for bit-oriented output and commands/output between amaster and its slave devices. The RSL protocol addresses the physical and link layers, therefore they will be theonly layers described in this document.Typical use includes:• Bit-oriented input to the controller e.g. buttons, keyswitches• Bit-oriented output from the controller e.g. tell-tale lights• Position indicator data stream• Electro-luminescent Display (ELD) data4 OSI Layer 1: – RSL PhysicalFollowing a synchronization sequence, the master station transmits data for each slave station and then readsdata from the slave stations.4.1 RSL Physical layerThis section defines the signal levels, cabling and logical representation of signals for the RSL.4.1.1 Signal levelsParameter MinMaxUnit Signal voltage levels for L1 and L2 data lines -6.0 35.0 VdcCommon mode rejection voltage High level: VL1 >= VL2 + 0.8 Vdc Low level: VL1 <= VL2 + 0.3 Vdc +4.0Vdc4.1.2 Power levelsParameter MinMaxUnit Power lines 17.7 35.0 VdcVoltage drop on power distribution line 2.0 VdcCurrent - board specific4.1.3 Bit Representation4.1.3.1 Signal LevelsParameter MinMaxUnit Logical “0” -6.0 0.8 VdcLogical “1” 17.0 35.0 Vdc4.1.4 Transmission MediumThe four wire serial link consists of two data lines and two power lines. The system allows for a maximumserial line length of 300 m and a tap length of 2m.4.1.4.1 Data transmission linesThe data lines are twisted pair to minimize differential voltage distortion. L1 is the data line and L2 is the clockline used for synchronization.4.1.4.2 Power linesThe power line pair may be twisted or parallel. The transmission line should have end-to-end impedance ofapproximately 100 ohms and approximate capacitance of 60 pf/meter. See reference [2].4.1.5 Connectors4.1.5.1 “Slave” Platforms (e.g. fixtures)4.1.5.1.1 One row of 4 pinsThis connector supports two links, the link supplying power and the link supplying control messages.Post RSL Signal Name Signal DescriptionFunction1 DL1 Differential – signal forRSLData Line 1 2 DL2 Differential – signal forRSLData Line 23 ReturnVoltage return for fixture powerReturn power for FixtureElectronics4 V RS+33 Volt to power fixture Supply for Fixture Electronics power5 OSI Layer 2: – RSL LinkThe master station provides the basis for data transfer cycles. It provides the clock pulsed, drives the output for all frames (stations/addresses) during the write cycle and reads the inputs from all frames (slave stations/addresses) during the read cycle.5.1 FramesData is transferred in ‘frames’ that are a nominally defined time of 800 µS made up of a 100 µS clock pulse and 5 data bits of 100 µS each. The data bits are bounded by 100 µS ‘dead’ slots. See reference [3].5.2 Data Cycles (Master Station driven)Each data transfer cycle consists of a three sequential sub-cycles (from the master station perspective): write, read, synchronization. See reference [3].5.2.1 Synchronization CycleThe Synchronization Cycle consists of two frames without clock pulses that are inserted between everyL2L2data write/read cycle.5.2.2 Write Cycle5.2.3 Read Cycle5.3 Frame TimingSignal Min Typ Max Unit Cycle Time 788 800 835 µS Clock Width 80 100 146 µS Data 80 100 146 µS5.4 Error DetectionThe RSL protocol supports detection of loss of synchronization. The master station monitors for bit and clock pulse errors, providing a flag on the detected error. See reference [2].6 OSI Layers 3 – 6: Not Supported7 OSI Layer 7This section describes the application of the frames and sdata (PI) bits as applied for basic RSL, CPI11/NEL and Global Aesthetic fixtures.7.1 Basic RSL Data formatThe master station performs as described above (section 5). Each slave station/address) is responsible to read 5-bits from frame 0, the 5th bit from frames 4 – 39 (36 ‘sdata’ bits related to PI information) and the 5 bits associated with its address. See references [2] and [3].7.1.1 Master Write /Slave ReadFrame 0: master provides a command that is read by all slave stations Frames 1 – 3: Not usedFrames 4 – 63: Master provides data for 60 slave stations addressed 4 to 63, including 5th bit ‘sdata’for frames 4-39. Slave stations read 4 bits from their station time slot (address) and the 5th bit from frames 4-39.7.1.2 Master Read /Slave WriteMaster station reads all frames.L2L1L2L1Frame 64: stations with address 0 (for test purposes) respond in this frameFrames 65 – 67: Not usedFrames 68 – 127: slave stations with address 4-63 respond in their sequential frame (time slot)7.2 CPI-11 / New Europa Line (NEL) RSL Data formatThis format modifies the meaning of the sdata (5th data bit in each frame of frames 4-39) and is NOT compatible with PI devices using the basic RSL protocol. See reference [5].7.2.1 ELD Frames7.2.1.1 Frame 07.2.1.2 Frame 17.2.2 7 & 16 Segment LCD Character Bit-maps7.2.2.1 Segment locations for LCD Position Indicator7.2.2.2 Bit map for LCD Segment code7.2.3 7 & 16 bit LCD Character Code list7.2.4 ELD Frame Description7.2.5 ELD Commands7.3 Global Aesthetics RSL Data formatThis format modifies the meaning of the sdata (5th data bit in each frame of frames 4-39) extending the sdata fields through the 55th frame and is NOT compatible with PI devices using the basic RSL protocol but IS compatible with CPI11/NEL devices. See reference [6].7.3.1 Frame 056-1277.3.2 Frame 1AppendixAPPENDIX A Definitions and AcronymsCPI Car Position IndicatorELD Electro-luminescent DisplayISO International Standards OrganizationNEL New Europa LineIndicator PI PositionRSL RemoteLinkSerialDefinition SID StandardInterface串行通讯的基本概念：与外界的信息交换称为通讯。
