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30. Which of the following serial communication protocol have ability to communicate over longer distances and at faster comm
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Answer #1

Answer: d RS-485

Explanation

a) RS-232 is point-to-point only and short distance, typically 20m. Not generally useful for 'multiple dispensers' without multiple serial ports and associated protocol and application software.
b&c) An appropriate comparison is ethernet to RS-485 Ethernet:
100m distance, rates to 100Mb or 1Gb, hub and spoke topology, transformer coupled signals minimizes common mode issues.
RS-485:
Distances to 1000m, rates dependent on distance, can range from the low hundreds/Kb at long distance to 1.5Mb at short distances, daisy chain/multidrop topology, balanced differential line but subject to common mode and bias issues.

"Serial servers" are a class of devices that can convert and re-package 485 data for TCP/IP passage across ethernet.

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