impedance and hence the possibility of catastrophic currents – enough to melt signal cables, PCB traces, and transceiver devices. RS-485 does not specify any connector or pinout. Circuits may be terminated on screw terminals, D-subminiature connectors, or other types of connectors. The standard does not discuss cable shielding but makes some recommendations on preferred methods of interconnecting the signal reference common and equipment case grounds. Waveform example The diagram below shows potentials of the A (blue) and B (red) pins of an RS-485 line during transmission of one byte (0xD3, least significant bit first) of data using an asynchronous start-stop method. See also List of network buses UART Notes References External links - The Standard for sale from the current publisher. – Practical information about implementing RS485 esp8266, esp32 and Arduino implementation with MAX485 and MAX3485 "How to interface Arduino, esp8266 or esp32 to RS-485" Serial buses Telecommunications-related introductions in 1998 EIA standards Serial digital interface