Though each protocol suits a particular application, in all cases you must consider cost and performance of the physical (PHY) layer. The various serial-datacom protocols range from RS-232 (EIA/TIA-232) to Gigabit Ethernet, and beyond. This application note shows how to go farther and faster. However, Maxim has raised the performance of RS-485 to 100Mbps with the introduction of products such as the MAX22500E. So, the crucial question is: How far can you reliably transmit and receive data at a specified data rate? The original publishing of this application note used the MAX3469 to demonstrate RS-485 performance, and that data is still valid. Designers of industrial datacom systems often ask, What data rates can be reliably achieved over what distance, and how? The design trade-off has always been less distance at a higher rate, or greater distance at a lower rate.
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