The YOKOGAWA ALR121-S00 is a serial communication module designed for industrial automation applications.

Function:

• The ALR121-S00 acts as an interface between a control system (PLC or DCS) and other devices using serial communication protocols. It facilitates the exchange of data between the control system and these devices.

Supported Interfaces:

• This specific model, ALR121-S00, is designed for RS-422 and RS-485 interfaces.
  • RS-422: This is a balanced, differential transmission standard suitable for multi-drop applications (where multiple devices share a single cable) over moderate distances.
  • RS-485: This is also a balanced, differential transmission standard but allows for longer cable lengths and more devices on a single bus compared to RS-422.

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