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RS-485, also known as TIA-485(-A) or EIA-485, is a standard, originally introduced in 1983, defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced , and multipoint systems are supported.
EIA-170/RS-170 applies only to monochrome (black & white) video. The later color video version is RS-170A which shows color burst and the 4 color field sequence of NTSC. The RS-170A version is only a tentative standard, and was never formally adopted. NAB Engineering Handbook Seventh Edition. [1] EIA-189A Formerly RS-189A.
The RT Validation Test Plan is intended for design verification of Remote Terminals designed to meet the requirements of AS 15531 and MIL-STD-1553B with Notice 2. This test plan was initially defined in MIL-HDBK-1553, Appendix A .
Although RS-232 ports are no longer available to users on the outside of most computers, many internal processors have UARTs built into their chips to give hardware designers the ability to interface with other chips or devices that use RS-232 or RS-485 for communication.
Only handles short distances compared to RS-232, RS-485, or CAN-bus (though distance can be extended with the use of transceivers like RS-422) Extensibility severely reduced when multiple subs using different SPI Modes are required Access is slowed down when main frequently needs to reinitialize in different modes; No formal standard
FTDI US232R : USB to RS-232 cable. A USB-to-serial adapter or simply USB adapter is a type of protocol converter that is used for converting USB data signals to and from serial communications standards (serial ports). Most commonly the USB data signals are converted to either RS-232, RS-485, RS-422, or TTL-level UART serial data.
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Modbus or MODBUS is a client/server data communications protocol in the application layer. [1] It was originally designed for use with programmable logic controllers (PLCs), [2] but has become a de facto standard communication protocol for communication between industrial electronic devices in a wide range of buses and networks.