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Siemens Mux_guide_v06 5.2 Multiplexer protocol versions

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Multiplexer User's Guide

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Mux_guide_v06 Page 34 of 36 30.06.2004

5.2 Multiplexer protocol versions

This section summarizes the differences of the existing multiplexer protocol versions.

1. No version check

• No break signal is sent

2. First version including the version check

• Additional features: Transparent signals DTR and RTS, escape sequence +++

transportable via MSC

3. Advanced version integrated in all modules listed in Chapter 1.1

• All features of version 2

• Transparent signals DSR, CTS, RING and DCD

• Send MSC request from module to host after version check on every channel to

signal the initial state

Modem status command (MSC):

Command

1 octet

Length

1 octet

DLCI

1 octet

V.24 signals

1 octet

Break Signals

(optional)

1 octet

Command:

Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8

1 C/R 0 0 0 1 1 1

Figure 14: MSC as used in version 3

Version specific differences in handling the modem status command MSC are explained in

Table 6.

V.24 signals:

Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8

1 FC RTC RTR reserved 0 reserved 0 RING DCD

Table 6: Version differences for MSC

Version

number

RTC RTR

Host application ⇒ Module

RTC RTR RING DCD

Module ⇒ Host application

1 1 1

If 0 is indicated, all calls are terminated

Not used

2 DTR RTS Not used

3 DTR RTS DSR CTS RING DCD

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