Siemens TC3 Series, User Manual

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TC3x Multiplexer User's Guide
TC3x_UG_01_V03.10 - Released Page 4/50 10.01.2002
7 Integrating the multiplexer into the customer application .................................................... 27
7.1 Tips and Tricks .................................................................................................................. 27
7.1.1
Terminal Flow Control........................................................................................ 27
7.1.2 Timeout after starting the multiplexer................................................................. 27
7.2 Restrictions........................................................................................................................ 27
7.3 Multiplexer control and signaling lines............................................................................... 28
7.3.1
Flow Control ....................................................................................................... 29
7.3.2 Escape Sequence .............................................................................................. 30
7.4 Power Saving .................................................................................................................... 30
7.5 Flash Management............................................................................................................ 30
8 Structure of the multiplexer protocol ...................................................................................... 31
8.1 Introduction of the multiplexer protocol ............................................................................. 31
Data link layer .............................................................................................................................. 31
8.2.1 Flag sequence.................................................................................................... 32
8.2.2 Address field ...................................................................................................... 32
8.2.3 Control field ........................................................................................................ 33
8.2.4 Length indicator.................................................................................................. 33
8.2.5 Information field ................................................................................................. 33
8.2.6 Frame checking sequence field (FCS) .............................................................. 33
8.3 State Diagrams.................................................................................................................. 34
8.3.1
Startup................................................................................................................ 37
8.3.2 DLC Establishment ............................................................................................ 38
8.3.3 Information transfer............................................................................................ 38
8.3.4 DLC release ....................................................................................................... 38
8.3.5 Closedown ......................................................................................................... 39
8.3.6 Multiplexer control channel ................................................................................ 39
8.3.6.1 Multiplexer close down (CLD) ............................................................................ 39
8.3.6.2 Test command (Test)......................................................................................... 40
8.3.6.3 Modem status command (MSC) ........................................................................ 40
8.3.6.4 Non-supported command response (NSC) ....................................................... 41
8.4 Samples of establishing logical channels.......................................................................... 41
8.4.1
Establishing logical channels without parameter negotiation............................. 41
8.4.2 Closing the multiplexer protocol and returning to AT mode ............................... 42
9 Version Control.......................................................................................................................... 43
9.1 Introduction........................................................................................................................ 43
9.2 Multiplexer versions........................................................................................................... 43
9.3 Implementation.................................................................................................................. 44
9.4 Case Descriptions ............................................................................................................. 45
9.4.1
Description case (01) ......................................................................................... 45
9.4.2 Description Case (02) ........................................................................................ 46
9.4.3 Description Case (03) ........................................................................................ 47
9.4.4 Description Case (04) ........................................................................................ 48
9.4.5 Abnormal Cases ................................................................................................ 48
9.5 Definitions.......................................................................................................................... 49
9.5.1
Coding of “TestCommand” message................................................................. 49
9.5.2 Example of “TestCommand” message .............................................................. 50