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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.
It was acquired by Crouse-Hinds Company in 1980; Crouse-Hinds was acquired by Cooper Industries in 1981 and spun off Belden as an independent company in 1993. In 2004 the company merged with Cable Design Technologies forming Belden CDT Inc. (now Belden Inc.) and since then the company has been headquartered in St. Louis. In 2005 John Stroup ...
On the physical layer, MODBUS over Serial Line performs its communication on bit by RS485 or RS232, with TIA/EIA-485 Two-Wire interface as the most popular way. RS485 Four-Wire interface is also used. TIA/EIA-232-E (RS232) can also be used but is limited to point-to-point short-range communication. [20]
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.
When used in relation to communications wiring, RS-422 wiring refers to cable made of 2 sets of twisted pair, often with each pair being shielded, and a ground wire. While a double-pair cable may be practical for many RS-422 applications, the RS-422 specification only defines one signal path and does not assign any function to it.
A cable with a 50-pin connector on one end can support six fully wired 8P8C connectors or Ethernet ports on a patch panel with one spare pair. Alternatively, only the necessary pairs for 10/100 Ethernet can be wired allowing twelve Ethernet ports with a single spare pair. This connector is also used with spring bail locks for SCSI-1 connections.
With electrical transmission [18] [19] pursuant to EIA-485, twisted pair cables with impedances of 150 ohms are used in a bus topology. [20] Bit rates from 9.6 kbit/s to 12 Mbit/s can be used. The cable length between two repeaters is limited from 100 to 1200 m, depending on the bit rate used. This transmission method is primarily used with ...
The larger of the two sizes is denoted as "Mini" (or alternatively, "Thick") cable, and is rated to carry up to 8 amperes of power supply current. The smaller of the two sizes is denoted as "Micro" (or alternatively, "Thin") cable using the M12 5-pin barrel connector specified in IEC 61076-2-101, and is rated to carry up to 3 amperes of power ...
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