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Computers, printers, fluorescent lights, variable speed motor drives and other electronic non-linear loads can also introduce significant frequency harmonics into power distribution neutral, ground lines, and communication network wires. These disturbances can cause real data errors in RS485 networks which isolation can alleviate. RS485 was developed and standardized to allow communication between transceivers with ground potential differences of up to +/-7V. The signals on the bus are allowed to assume voltages of -7V to +12V with respect to the local "ground" at any node. Proper use of an isolated transceiver, like the LTM2881, extends the allowed range of common mode voltage and protects against damage from high voltages of 560V continuously, or 3750VDC for 60 seconds.
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