Connect Instrument To The Bus System - TESTO 6681 Profibus Instruction Manual

testo 6681 Profibus
42

1.3.4 Connect instrument to the bus system

Overview
Characteristics
RS485 transmission technology
Baud rates between 9 kBit/s and 12 Mbit/s
Connected in linear structure (see Fig. above).
Stubs
These should be avoided, as they cause reflections on the bus and thereby
disruptions in communication (especially as of transfer rates ≥ 1.5 Mbits/s).
Connecting a bus monitor or similar is also an example of a stub, so these
instruments should only be connected via active stubs (see Section
Terminating resistor, chapter 1.3.4.2, page 45).
- 1.3 Commissioning
1 Terminati
ng
resistor
2 Profibus
3 Profibus