Technical implementation:
- Tools: LabVIEW, TestStand, LabWindows/CVI
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.
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.
Technical implementation:
- Instrumentation: Instrumentation: audio generator / audio analyzer UPL from Rohde y Schwarz.
The AK protocol define a communication protocol over serial RS-232 or TCP/IP connection between devices, typically between a PC and measuring instruments.
OPC, OLE for Process Control, is an unified communications technology between industrial control process and Windows. It is generally used for the communication of PLCs and HMI or SCADA software. It runs on the client-server mode.
