BUS-TR
Logic bus transceiver
Drives data between two digital buses according to the selected direction and enable conditions.
Schematic
Symbols · RS485
RS-485 transceiver
In plain English
What does RS-485 transceiver mean?
An RS-485 transceiver sends and receives differential serial signals on its specified bus arrangement.
A simple example
An industrial device can use the interface to communicate over a compatible serial link.
What the drawings help you do
Mark the logic-side transmit/receive signals and the bus pair separately. RS-485 describes the electrical interface, so a drawing should also identify the application protocol and the intended half- or full-duplex arrangement. Reference the selected termination, bias and protection circuits.
- Differential signalling
- Representing information by the voltage difference between two conductors.
- Protocol
- The rules by which connected equipment interprets exchanged messages.
Before using this reference
- Identify the application protocol separately from RS-485.
- Show the selected bus pair, termination and reference arrangement.
- Label direction-enable signals if the chosen transceiver uses them.
Does RS-485 mean the system is using Modbus?
No. Modbus is one possible application protocol. RS-485 describes electrical signalling and does not establish which messages the connected equipment understands.
Read the source: RS-485 and RS-422 interfaces
Schematic · RS485
A distinction that matters
RS-485 defines an electrical interface; it does not by itself specify the application protocol.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
RS-485 and RS-422 interfaces
RS-485 and RS-422 interfaces: public technical context for the named function. Product and compliance details remain with the publisher.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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