A key requirement in industrial and instrumentation (I&I) applications is a reliable data interface for inspecting connected systems via a diagnostic port. The RS-232 bus standard is one of the oldest and most widely used physical-layer bus designs in I&I applications. First introduced in 1962, RS-232 is a singleended data transmission standard; yet despite rumors of its early demise, it continues to be widely used throughout the industry for communications over a short cable.

To achieve a robust data communications link in harsh industrial environments, the RS-232 diagnostic port must provide an isolated interface between the RS-232 cable network and the connected systems to protect against voltage spikes and ground loops within the noisy environment and improve system reliability. Power isolation of the RS-232 communication link is obtained by using an isolated dc-to-dc power supply or Analog Devices, Inc., isoPower® integrated dc-to-dc converter technology. Signal isolation of the RS-232 communication link is implemented using optocouplers or Analog Devices iCoupler® technology.

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