The RS-485 is a serial bus standard. It is an evolution of the RS-422 and like it, the RS-485 cable is composed of a twisted pair. We can form a point to point network linking up to 64 devices (32 transmitters and 32 receivers, this is the diference with the RS-422), and up to 1200 meters in length. It operates in differential mode on levels -6V and +6V and can reach speeds up to 10 Mbits/s. It can operate in half-duplex or full duplex with 4 wires.
Category: Hardware
Definitions of technical software terms for the development of mechatronic test, measurement, control, simulation and monitoring systems and technologies from National Instruments.
The RS-422 is a standard for serial bus. It is newer than the RS-232 and more efficient. The RS-422 cable contains a twisted pair. We can form a point to point network linking up to 10 devices (1 driver and 10 receivers) and up to 1200 meters in length. It operates in differential mode on levels +6V -6V and can reach speeds up to 10Mb/s. It can operate in half-duplex or full duplex with 4 cables.
The RS-232 is a standard for serial bus. It operates in point to point mode with one transmitter and one receiver, up to 15 meters in length. It operates with voltages of -15V to -3V for logic 1 and +3V to +15V for logic 0 (typically -12V to +12 V) and can reach speeds of 20Kb/s.
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AK protocol
The AK protocol define a communication protocol over serial RS-232 or TCP/IP connection between devices, typically between a PC and measuring instruments.
GPIB or IEEE 488 is the specification that defines a parallel bus of digital communication over short distances. It is widely used in industry or scientific research to test applications and able to control instruments (multimeters, oscilloscopes, spectrographs, power …).
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Fieldpoint and Compact Fieldpoint
Fieldpoint (cFP) and Compact Fieldpoint (cFP) are PAC (programmable automation controller) for command and control industrial applications. They come in the form of a backplane hardened, 4 to 8 slots, to connect modules: DIO, DAQ, relays, voltage or current outputs, Ethernet, serial and other protocols, blocks connections and programmable controllers.
You can use Compact Fieldpoint with a programmable controller in LabVIEW to create an independent PAC, or else use without controller connected to a computer to order by LabWindows/CVI or LabVIEW.
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Digital Inputs Outputs (DIO)
DIO cards for Digital Inputs/Outputs, are used to acquire digitals signals, whose levels are typically 0-5V or 0-10V, 0-12V to 0-24V. The newest cards allow you to select the voltage ranges and use of high frequency switching.
They are often used to monitor a condition (eg whether a valve is open or closed) or send an order (order of opening or closing a relay).
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Data acquisition (DAQ)
Data acquisition cards are used to acquire electrical signals and convert them into digital data to allow software computation. These signals art images of a physical measurement such as, for example, pressure, temperature, speed or other electrical phenomena.
VAN, for Vehicle Area Network, is a communication bus between ECUs developed by PSA Peugeot Citroen and Renault.