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MICROMASTER 420 Reference Manual
Issue A1
39
3 Communications
This chapter contains detailed information on the operation of the Universal Serial
Bus (USS) and the PROFIBUS protocol .
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3.1 Using the Serial Interface ........................................................................................41
3.2 Working with Serial Communications......................................................................41
3.2.1 Introduction..............................................................................................................41
3.2.2 Troubleshooting with RS485 ...................................................................................42
3.3 Using the Universal Serial Interface Protocol..........................................................43
3.3.1 Telegram structure ..................................................................................................43
3.3.2 Detailed Description of the USS Protocol Message................................................43
3.3.3 Useful Data Characters ...........................................................................................44
3.3.4 Tasks and reply for USS..........................................................................................47
3.3.5 PKW Examples:.......................................................................................................49
3.3.6 PZD area (Process Data area)................................................................................51
3.3.7 Task telegram (Master → MICROMASTER 420)....................................................52
3.3.8 Reply telegram (MICROMASTER 420 → Master) ..................................................53
3.3.9 Parameter settings on MICROMASTER 420 for USS.............................................55
3.3.10 Basic Setup..............................................................................................................56
3.3.11 Common advanced settings....................................................................................56
3.3.12 Further advanced settings.......................................................................................57
3.3.13 Compatibility with previous MICROMASTER products...........................................57
3.3.14 Reading and Writing Parameters ............................................................................58
3.3.15 Broadcast Mode.......................................................................................................58
3.3.16 Using BiCo with USS...............................................................................................59
3.4 PROFIBUS ..............................................................................................................60
3.4.1 Overview..................................................................................................................60
3.4.2 Using the PROFIBUS..............................................................................................60
3.5 PROFIBUS Module .................................................................................................61
3.5.1 Features of PROFIBUS Module ..............................................................................61
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