ALR111-S01 Serial Module – RS-232C Modbus Slave | Yokogawa

Product Overview

• ALR111-S01 – a serial communication module from Yokogawa.
• Provides RS-232C point‑to‑point connection for legacy devices.
• Supports Modbus slave and subsystem communication functions.
• Compact, reliable, and easy to integrate into DCS systems.

Key Features

• RS-232C interface – two D‑sub 9‑pin female ports.
• Half‑duplex – with start‑stop synchronization.
• Flexible baud rates – 1200 to 38400 bps, selectable.
• Configurable parity – none, even, or odd.
• Stop bits – 1 or 2 bits (fixed 1 for subsystem).
• Transmission distance – up to 15 meters.
• Low power – draws only 0.5 A.
• G3 compliant – with ISA Standard G3 (suffix option).

Technical Specifications

• Brand – Yokogawa
• Model – ALR111-S01
• Series – ALR111
• Type – Serial communication module
• Interface – RS-232C
• Connection – Point‑to‑point
• Duplex mode – Half‑duplex
• Synchronization – Start‑stop
• Baud rates – 1200, 2400, 4800, 9600, 19200, 38400 bps
• Transmission code – Binary
• Character length – 8 bits (fixed for Modbus and subsystem)
• Stop bits – 1 or 2 (fixed 1 for subsystem)
• Parity – None, even, or odd
• Lag time after TX – 1 ms
• Max distance – 15 m
• Connectors – D‑sub 9‑pin female (2 ports)
• Functions – Modbus slave, subsystem communication
• Current consumption – 0.5 A
• Weight – 0.3 kg
• Suffix codes – S (standard), 0 (no explosion protection), 1 (ISA G3)

Compatibility & Mounting

• Mounts on – SSC60, SSC50, SSC57, SSC10, or SNB10D.
• Bus connection – SNB10D connects via ESB bus.
• Cables – AKB131, AKB132, AKB135, AKB136.
• Both ports – Must use the same communication function (Modbus or subsystem).
• Multiple functions – Not possible simultaneously on one module.

Installation & Wiring

• Mounting – Insert into compatible base (SSC/SNB).
• Wiring – Use shielded cables for RS‑232 (max 15 m).
• Configuration – Set baud rate, parity, and stop bits via software.
• Diagnostics – Check LEDs for power and communication status.

Packaging & Delivery

• Includes – 1 ALR111-S01 module, quick guide.
• Warranty – 12 months against defects.
• Shipping – 12‑24 hours via FedEx, UPS, or DHL.

Expert Review

• Manager’s Insight: “The ALR111-S01 is a workhorse for connecting older serial devices to modern DCS. Its dual RS‑232 ports and flexible baud rates make it invaluable for legacy system integration. The G3 option is a plus for harsh environments.”

Applications

• Ideal for – Connecting flow meters, analyzers, and legacy PLCs.
• Works in – Oil & gas, chemical, power plants, and water treatment.
• Best used with – Yokogawa CENTUM VP, ProSafe‑RS, or STARDOM.

Comparison

• ALR111-S01 vs. ALR121-S01 – ALR111 is RS‑232; ALR121 is RS‑422/485. Choose based on distance and wiring.
• ALR111-S01 vs. ALR111-S00 – S01 has G3 coating for corrosion protection; S00 does not.
• ALR111-S01 vs. ALR111-S10 – S10 has explosion protection; use in hazardous areas.
• Compare details: Yokogawa DCS Series

FAQ

• Q: What is the maximum transmission distance?
  A: 15 meters (RS‑232C limit).
• Q: Can I use Modbus and subsystem on two ports?
  A: No, both ports must use the same function.
• Q: What baud rates are supported?
  A: 1200, 2400, 4800, 9600, 19200, and 38400 bps.
• Q: How do I connect this module to my system?
  A: Mount on SSC60/SSC50/SSC57/SSC10 or SNB10D base.
• Q: What cables work with this module?
  A: AKB131, AKB132, AKB135, or AKB136.
• Q: Is the character length adjustable?
  A: No, it is fixed to 8 bits for Modbus and subsystem.
• Q: What is the G3 suffix for?
  A: ISA Standard G3 provides corrosion resistance for harsh environments.
• Q: What is the warranty period?
  A: 12 months from purchase.
• Q: How fast is delivery?
  A: We ship within 12‑24 hours via FedEx, UPS, or DHL.

Selection Guide

• Choose ALR111-S01 if:
  • You need RS‑232 communication for legacy devices.
  • Your application requires Modbus slave or subsystem function.
  • You operate in a corrosive environment (G3 option).
• Consider other models if:
  • You need RS‑422/485 – choose ALR121 series.
  • You require explosion protection – choose suffix “1” with explosion rating.
  • You need both functions simultaneously – use two separate modules.
• Pro tip: For long‑term reliability in chemical plants, always choose the G3 version.

Contact Information:
Email: sales@powergearx.com
Phone/WhatsApp: +86 18030005825

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