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RS485 Application
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From B&B Electronics Manufacturing Co. Inc.
The EIA/TIA RS-485 communications standard, an upgrade of RS-422, supports 32 devices (driver/receiver pairs) in a party line or multi-drop mode, on a cable of up to 4,000 feet for balanced differential signal transmissions at a common-mode voltage (Vcm) of -7 to +12 V. You can internally or externally configure RS-485 devices. Four-wire connections, which require an additional ground, require a 'master' node (e.g., a PC) that communicates to all others, called 'slaves,' which in turn can only communicate with the master. Products & Services
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11.02 RS-485
The RS-232C standard requires that a direct connection be made between two devices. This is known as a point-to-point interface. If, for example, you need to communicate with many...
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13.1 In this Chapter
This chapter contains the description of a device capable of reading the status of a number of digital inputs, or the values of a number of analog inputs, to store this...
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First in the laboratory, and then on the plant floor, serial digital communication was the earliest means of data transmission from device to device. In the lab, and on the test bench, digital data...
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Modbus is a communication protocol developed by Modicon systems. In simple terms, it is a method used for transmitting information over serial lines between electronic devices. The device requesting...
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The RS-485 communications standard was introduced in 1983 by the Electronic Industries Alliance (EIA) as a two-wire, half-duplex, multi-drop alternative to the point-to-point RS-232 interface. (Note:...
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