Siemens sitrans tr200, Operating Instructions Manual

Page: 73 / 78

Glossary
SITRANS TR200/TR300
Operating Instructions, 04/2007, A5E01071992-01
73
HART
HART (Highway Addressable Remote Transducer) is a standardized, widely used
communications system used to structure industrial fieldbuses. The communications system
provides digital communications for multiple participants (field devices) via a common
databus. HART is based especially on the equally widely used 4/20 mA standard for the
transfer of analog sensor signals. The cabling from existing older systems can be used
directly and both systems operated in parallel.
HART specifies several protocol levels in the OSI model. It facilitates the transfer of process
and diagnostics data and control signals between field devices and high-level control
systems. Standardized parameter sets can be used for the manufacture-independent
operation of all HART devices.
Typical applications include transmitters for measuring mechanical and electrical
dimensions.
IP
International Protection = international degree of protection
Microcontroller
Microcontrollers (also written µControllers, µC, MCU) are single-chip computer systems
which have virtually all their components - such as main processor, program memory,
working memory and the input/output interfaces - accommodated on a single chip.
Non-volatile memory
→
EEPROM
RS -232
RS: Recommended Standard
A recognized industry standard for serial data transfer. For cable lengths shorter than 15 m.
No differential evaluation. Transmit and receive on different lines.
Sensor
In electrical engineering, a sensor is a component that can qualitatively measure not only
specific physical or chemical properties (such as heat radiation, temperature, humidity,
pressure, excess pressure, sound, brightness, magnetism, acceleration, force) as well as the
physical condition of its surroundings or register them as quantitatively measured variables.
USB
The Universal Serial Bus (USB) is a serial bus system for connecting a PC/laptop to external
devices such as: modems.