Siemens Mux_guide_v06 manual Version DocID Muxguidev06, Siemens Cellular Engines

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Multiplexer User's Guide

Siemens Cellular Engines

Version: 06

DocID: Mux_guide_v06

User’s Guide

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Contents Siemens Cellular Engines Version DocID Muxguidev06Multiplexer Users Guide Document Name Multiplexer Users GuideJune 30 Muxguidev06Contents Multiplexer protocol version control TablesDocument history Chapter What is newIntroduction References Supported products and related documentsAbbreviation Description Term and abbreviationsProduct concept and architecture Multiplexer protocol an overviewVirtual channels and AT commands Integrating multiplexer into the customer application CharacteristicsBasic requirements RestrictionsFunctions without channel dependencies Timing conditions Flow control Multiplexer control and signaling linesLogical flow control RTS/CTS on the physical channelsCOM M COM N COM P RTS/CTS RTS/CTS on the logical channelsBandwidth of logical channels Power savingEscape sequence Introduction of the multiplexer protocol Structure of the multiplexer protocolData link layer Address field Flag sequenceFrame Type Control fieldInformation field Length indicatorFrame checking sequence field FCS BitState diagrams Relationship between the customer µC and the GSM engine µC AT+CMUX Serial Interface Customer GSM engineCustomer µC Serial interfaceEngine CustomerGSM engine ResponderDLC release Close-down procedureMultiplexer control channel Type fieldMultiplexer close down CLD Test command TestLength field Modem status command MSC Break signal optional Bit Not supported Commands Bit Description Power saving control PSCType Bit Value octet Length=1 BitValue octet Bit Command Type Non-supported command response NSCNon-supported command No Value octet Length=0AT+CMUX Customer GSM engine µCIntroduction Multiplexer protocol version controlSignals Break Signals Octet Optional Command Bit Modem status command MSCSignals Bit Multiplexer protocol versionsImplementing version control TroubleshootingExample of TestCommand message Coding of TestCommand message