Siemens Mux_guide_v06 manual Serial interface, Customer µC

Page 24

Multiplexer User's Guide

Confidential / Released

s

mobile

Serial interface

 

Customer µC

GSM engine µC

 

Connected

Connected

 

RequestDISC

IndicationDISC

 

 

 

ConfirmUA

ResponseUA

Release

 

 

DLC

 

 

Disconnected

Disconnected

 

Disconnected/

Disconnected/

 

Disconnected

Disconnected

 

Negotiation/

Negotiation/

 

Connected

Connected

 

RequestCloseDown

IndicationCloseDown

Down

 

 

 

ConfirmCloseDown

ResponseCloseDown

Close

 

Closed Down

Closed Down

 

Figure 6: MP - DLC release and close down

Mux_guide_v06

Page 24 of 36

30.06.2004

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Contents Version DocID Muxguidev06 Siemens Cellular EnginesDocument Name Multiplexer Users Guide Multiplexer Users GuideJune 30 Muxguidev06Contents Tables Multiplexer protocol version controlChapter What is new Document historyIntroduction Supported products and related documents ReferencesTerm and abbreviations Abbreviation DescriptionMultiplexer protocol an overview Product concept and architectureVirtual channels and AT commands Characteristics Integrating multiplexer into the customer applicationBasic requirements RestrictionsFunctions without channel dependencies Timing conditions Multiplexer control and signaling lines Flow controlLogical flow control RTS/CTS on the physical channelsRTS/CTS on the logical channels COM M COM N COM P RTS/CTSPower saving Bandwidth of logical channelsEscape sequence Structure of the multiplexer protocol Introduction of the multiplexer protocolData link layer Flag sequence Address fieldControl field Frame TypeLength indicator Information fieldFrame checking sequence field FCS BitState diagrams Relationship between the customer µC and the GSM engine µC Serial Interface Customer GSM engine AT+CMUXSerial interface Customer µCCustomer EngineGSM engine ResponderClose-down procedure DLC releaseMultiplexer control channel Type fieldTest command Test Multiplexer close down CLDLength field Modem status command MSC Break signal optional Bit Not supported Power saving control PSC Commands Bit DescriptionType Bit Value octet Length=1 BitNon-supported command response NSC Value octet Bit Command TypeNon-supported command No Value octet Length=0Customer GSM engine µC AT+CMUXMultiplexer protocol version control IntroductionModem status command MSC Signals Break Signals Octet Optional Command BitSignals Bit Multiplexer protocol versionsTroubleshooting Implementing version controlCoding of TestCommand message Example of TestCommand message