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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.
An 8 pin circular connector is used to connect (or daisy chain) AISG devices. AISG consortium has released C485 standard for this RS-485 connector. This standard specifies the mechanical dimensions of the connector more tightly than the previously used standard (IEC 60130-9 - Ed. 3.0 standard with screw-ring locking ring).
Note: the daisy-chain configuration doesn't need more than one shared CS; Typically lower power requirements than I²C or SMBus due to less circuitry (including pull up resistors) Single main means no bus arbitration (and associated failure modes) - unlike CAN-bus; Transceivers are not needed - unlike CAN-bus
A graphic representation of a daisy chain A daisy garland, a chain of daisy flowers A series of devices connected in a daisy chain layout. In electrical and electronic engineering, a daisy chain is a wiring scheme in which multiple devices are wired together in sequence or in a ring, [1] similar to a garland of daisy flowers. Daisy chains may ...
The daisy chain cable configuration means that a message walks the chain until it reaches the target device identified in the data packet. Responses then walk the rest of the way down the chain and back up again to reach the system. Some packets may be broadcast to all devices. A command data packet consists: Address byte (1) message header
The output of the first node, D 2, is connected to the input, D 1 of the second node, and so on resulting in a daisy chain. Each configuration pin D x (x=1-2) has additional circuitry to aid in the position detection. Switchable resistive pull-up to V bat; Pull-down to GND; Comparator referenced to V bat /2
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.
The flange design, inner and outer conductor dimensions are standardized, by EIA, in the RS-225, 50 Ω (ohm), and RS-259, 75 Ω, standards.They are commonly referred to by the inner diameter of the outer conductor in fractional inches.