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Communication buses

RS-485

Industrial differential serial bus. Long cable runs, multi-drop, noise-tolerant.

How it looks

Drawing: this is not on CORE3588, so it is drawn
ABnode 1node 2node 3node 4120 ohm120 ohm
An RS-485 line: one pair, up to 32 nodes, up to about a kilometre. Not on CORE3588.

How it works

LONG CABLES, NOISY FACTORIESABnode 1node 2node 3node 4120 ohm120 ohmone twisted pair along the whole machinesignal = difference between A and B, so noise cancelsone node talks at a time; the protocol on top decides who

Where it fits

A cousin of CAN; a UART is often what drives it, through a small transceiver chip.

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