MCS20-230/24 | MURR | Power Module

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The principle difference between RS-422 and RS-485 is that the RS485 driver can be put into a high impedance, tri-state mode, which allows other drivers to transmit over the same pair of wires. There are several methods of accomplishing this task. 

One common method is to use a control line (often the RTS handshake line) to enable and disable the driver. The host software must assert the RTS line and enable the driver before beginning a transmission, then release the RTS line after the completion of the transmission.

MURR   MCS20-230/24

MCS20-230/24 | MURR | Power Module

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Since only a single RS-485 driver can be enabled on a network at one time it is important that the driver is disabled as quickly as possible after transmission to avoid two drivers trying to control the lines simultaneously, a condition called line contention. 

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