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Siemens Mux_guide_v06 4.4 Example: Establishing logical channels without parameter negotiation

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Multiplexer User's Guide

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Mux_guide_v06 Page 32 of 36 30.06.2004

4.4 Example: Establishing logical channels without parameter negotiation

• Send AT+CMUX=0; wait for the response

• Send Request SABM for DLCI = 0; wait for the response

• Send Request SABM for all requested DLCIs; wait for the response

As a result the multiplexer is established and information / data can be transmitted

(⇒ ready for Information Transfer).

Customer

µC

Closed Down Closed Down

RequestStartUp

ResponseStartUp

ConfirmStartUp

IndicationStartUp

DisconnectedDisconnected

Serial

interface

Start Up

"AT+CMUX"

Connected

DLCI = 0

DLC Establishment,

Create DLCI = 0

Disconnected

DLCI = 0

Disconnected

DLCI = 0

RequestSABM

DLCI = 0 IndicationSABM

DLCI = 0

ResponseUA

DLCI = 0

ConfirmUA

DLCI = 0

Connected

DLCI = 0

Connected

DLCI = 1

DLC Establishment,

Create DLCI = 1

Disconnected

DLCI = 1

Disconnected

DLCI = 1

RequestSABM

DLCI = 1 IndicationSABM

DLCI = 1

ResponseUA

DLCI = 1

ConfirmUA

DLCI = 1

Connected

DLCI = 1

GSM engine µC

Figure 13: Establishing the multiplexer control channel and the logical channel

Contents

Main Users Guide Multiplexer User's Guide Multiplexer User's Guide Confidential / Released Mux_guide_v06 Page 2 of 36 30.06.2004 Contents Figures Tables 0 Document history 1 Introduction 1.1 Supported products and related documents 1.2 References 1.3 Term and abbreviations 2 Multiplexer protocol an overview 2.1 Product concept and architecture 2.2 Virtual channels and AT commands 3 Integrating multiplexer into the customer application 3.1 Characteristics 3.1.1 Basic requirements 3.1.2 Restrictions 3.1.3 Dependencies between multiplexer channels and restrictions of use 3.1.4 Functions without channel dependencies 3.1.5 Timing conditions 3.1.6 Operation of a second physical serial interface ASC1 (if applicable) 3.2 Multiplexer control and signaling lines 3.2.1 Flow control Page 3.2.2 Escape sequence 3.3 Power saving 3.4 Bandwidth of logical channels 4 Structure of the multiplexer protocol 4.1 Introduction of the multiplexer protocol 4.2 Data link layer 4.2.1 Flag sequence 4.2.2 Address field 4.2.3 Control field 4.2.4 Length indicator 4.2.5 Information field 4.2.6 Frame checking sequence field (FCS) 4.3 State diagrams Figure 4: Relationship between the customer C and the GSM engine C Customer C Master state machine GSM engine C Slave state machine Customer C GSM engine C Figure 5: MPI Startup, DLC establishment and information transfer Serial interface Customer C GSM engine C Serial i nterface 4.3.1 Start-up procedure 4.3.2 DLC establishment Customer C GSM engine 4.3.3 Information transfer Customer C (Initiator) GSM engine (Responder) Customer C GSM engine 4.3.5 Close-down procedure 4.3.6 Multiplexer control channel Information Field 4.3.7 Multiplexer close down (CLD) 4.3.8 Test command (Test) 4.3.9 Modem status command (MSC) Page 4.3.10 Power saving control (PSC) 4.3.11 Non-supported command response (NSC) Multiplexer User's Guide Confidential / Released 4.4 Example: Establishing logical channels without parameter negotiation Customer C Serial interface GSM engine C Figure 13: Establishing the multiplexer control channel and the logical channel 5 Multiplexer protocol version control 5.1 Introduction 5.2 Multiplexer protocol versions 5.3 Implementing version control 5.3.1 Troubleshooting 5.3.2 Coding of TestCommand message 5.3.3 Example of TestCommand message