Siemens Multiplexer Mux_guide_v06 Bedienungsanleitung PDF herunterladen (Seite 32)

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

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