Siemens SIMATIC RS 485 Manual page 43

Reference potential
Reference potential for the evaluation / measuring of the voltages of participating circuits.
RS 485
Asynchronous data transmission technology for PROFIBUS DP to ANSI TIA/EIA-RS485-A.
RS 485 repeater
Device for amplifying bus signals and for linking → segments over long distances.
Slave
A slave may only exchange data with a master when requested to do so. Slaves include, for
example, all DP slaves such as ET 200S, ET 200X, ET 200M etc.
Standard mounting rail
Metal rail standardized in compliance with EN 50 022.
The standard mounting rail is used for the snap-on installation of network components such
as OLMs, repeaters etc.
Terminator
-> terminating resistor in segments at transmission rates of 9.6 kbps to 12 Mbps; the power
supply is separate from the bus nodes.
Transmission rate
-> Transmission speed
Transmission speed
The transmission speed specifies the number of bits transmitted per second. On PROFIBUS,
transmission speeds of 9.6 kbps to 12 Mbps are possible.
RS 485 Repeater
Manual, 02/2011, A5E03382072-01
Glossary
43