Yokogawa ALR121-S01 Serial Communication Module

Hardware Specifications

Yokogawa Serial Communication and DCS Interface Characteristics

The ALR121-S01 provides two RS-422/RS-485 communication ports for Yokogawa FIO field control configurations. Moreover, the module executes subsystem communication with equipment such as FA-M3 through serial interfaces using configurable transmission parameters.

The module supports half-duplex communication with start-stop synchronization. Therefore, users can configure transmission speed, character length, stop bits, and parity settings according to connected subsystem requirements.

In addition, the ALR121-S01 supports RS-485 multipoint communication and RS-422 point-to-point communication. The design includes channel communication control functions for stable serial data exchange within Yokogawa control architectures.

For Yokogawa process control applications, engineers typically evaluate communication wiring, signal grounding, and noise isolation. Furthermore, proper cable shielding and termination practices help maintain signal integrity in industrial environments.

Frequently Asked Questions

Q: What serial interfaces does the Yokogawa ALR121-S01 support?
A: The ALR121-S01 supports RS-422 and RS-485 interfaces. It provides point-to-point communication for RS-422 and multipoint communication for RS-485 networks.

Q: What communication parameters can be configured on the ALR121-S01?
A: The module supports transmission speeds from 1200 to 38400 bps, 7 or 8 bit character length, 1 or 2 stop bits, and none/even/odd parity checking.

Q: Which Yokogawa units can mount the ALR121-S01 module?
A: The module can be mounted on AFV30, AFV40, AFV10, AFF50 field control units, ANB10 ESB bus node units, ANB11 optical ESB bus node units, and ANR10 ER bus node units.

Field Installation Guidelines

Install the ALR121-S01 only in compatible Yokogawa FIO hardware locations specified for the module.

Use shielded communication cables for RS-422/RS-485 wiring. Connect cable shielding according to the system grounding design to reduce electromagnetic interference.

Separate serial communication wiring from high-voltage power cables and strong electromagnetic sources. Verify terminal connections, connector seating, and cable routing before system commissioning.

Confirm communication settings between the ALR121-S01 and connected subsystems, including baud rate, parity, character length, and stop bit configuration.