CMUX Serial Port Multiplexer - M2M Platforms
CMUX Serial Port Multiplexer - M2M Platforms
CMUX Serial Port Multiplexer - M2M Platforms
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<strong>CMUX</strong> <strong>Serial</strong> <strong>Port</strong> <strong>Multiplexer</strong>Telit @ <strong>M2M</strong> <strong>Platforms</strong> Seminarwww.m2m-platforms.come-mail: sales@m2m-platforms.com
<strong>CMUX</strong> <strong>Serial</strong> <strong>Port</strong> <strong>Multiplexer</strong>The <strong>Multiplexer</strong> mode enables one physical serial interface totransmit data to four different customer applications.This is achieved by providing four virtual channels using a<strong>Multiplexer</strong> (Mux).Using the <strong>Multiplexer</strong> features, e.g. controlling the module orusing the SMS service can be done via the additional channelswithout disturbing the data flow.Author: Telit wireless solutions 2007/12
<strong>CMUX</strong> <strong>Serial</strong> <strong>Port</strong> <strong>Multiplexer</strong>To access the three virtual interfaces, both the GSM engine andthe customer application must contain Mux components, whichcommunicate over the multiplexer protocol.What <strong>CMUX</strong> is?4 Virtual <strong>Serial</strong> <strong>Port</strong>3 with AT interface1 for special use e.g. Trace, GPS Nmea output and in thefuture audio stream (i.e. bluetooth earpiece)Author: Telit wireless solutions 2007/13
<strong>CMUX</strong> ArchitectureDCE(Module)DTE(E.g. Windows PC)AT Inter.#1AT Inter.#2AT Inter.#3Trace/Gps NMEARS232(ASC0)GSM 7.10(TE-MS)multiplexerprotocolCom[N]Virtual <strong>Serial</strong> <strong>Port</strong>DriverBased onEltima SWCom[N+1]Com[N+2]Com[N+3]Author: Telit wireless solutions 2007/15
<strong>CMUX</strong> <strong>Serial</strong> <strong>Port</strong> <strong>Multiplexer</strong>OLDNEWAP InterfaceBASIPIPIPBASCE DSAT IfaceIPLMLPProtocolStackAnd Layer1AT Iface#0SER0SER1Special AppsLike GPS, Python,SAP…ProtocolStackAnd Layer1LMSERnLPVirtual serials - <strong>CMUX</strong>ASC0ASC1 SSC …RamFifoASC0Author: Telit wireless solutions 2007/16
Enter multiplexed modeAT+<strong>CMUX</strong> = [,]The command enable/disable the GSM 07.10 multiplexing protocol controlchannel.multiplexer transparency mechanism0 - basic option; it is currently the only supported value. 0 - UIH frames used only; it is currently the only supportedvalue.Note: after entering the Multiplexed Mode a timeout of five seconds start.If no <strong>CMUX</strong> control channel is established the engine returns to ATCommand Mode. All the <strong>CMUX</strong> protocol parameter are fixed as definedin GSM07.10 and cannot be changed.Author: Telit wireless solutions 2007/18
<strong>CMUX</strong> <strong>Serial</strong> <strong>Port</strong> <strong>Multiplexer</strong><strong>CMUX</strong> will be only available on products based onLITE Platform.Author: Telit wireless solutions 2007/19
<strong>CMUX</strong> <strong>Serial</strong> <strong>Port</strong> <strong>Multiplexer</strong>Telit <strong>Serial</strong><strong>Port</strong> MuxTray IconAuthor: Telit wireless solutions 2007/110
Join Telit wireless solutions!Author: Telit wireless solutions 2007/111
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