Yokogawa ACM21 RS-232 Communication Module

Product Introduction

The Yokogawa ACM21 RS-232 Communication Module is a high-performance serial communication interface designed for reliable data transfer in distributed control systems. It enables seamless connectivity between field devices, controllers, and monitoring units using RS-232. Its compact design and robust construction make it suitable for integration into Yokogawa CENTUM and STARDOM systems, ensuring consistent performance in industrial environments.

---

Product Advantages

• Reliable RS-232 communication between control systems and external devices.

• Optical isolation to reduce noise and interference.

• Flexible configuration for multiple communication modes.

• Compact and easy to install or replace.

• Compatible with Yokogawa DCS systems and third-party devices.

• Industrial-grade durability for stable operation under varying environmental conditions.

---

Technical Specifications

---

Product Applications

• Connecting control systems to serial instruments such as analyzers and sensors.

• Data acquisition and logging in industrial automation systems.

• Supervisory monitoring and alarm systems.

• Integrating DCS subsystems with external computing devices.

• Industrial applications in oil & gas, chemical, power generation, and water treatment plants.

---

Installation Instructions

1. Power down the system before installation.

2. Mount the module on a DIN rail or panel.

3. Connect the RS-232 communication cable.

4. Wire the 24 V DC power supply.

5. Power on and verify TX/RX LED indicators.

6. Configure communication settings (baud rate, parity, protocol) via system software.

---

FAQ

Q1: What is the main function of the ACM21 module?
A1: It provides RS-232 serial communication between Yokogawa control systems and external devices such as analyzers, sensors, or computers.

Q2: Does the ACM21 support Modbus communication?
A2: Yes, it supports Modbus RTU over RS-232 for integration with third-party devices.

Q3: How is communication status monitored?
A3: The module features TX and RX LEDs that indicate active transmission and reception.

Q4: Can the baud rate be configured?
A4: Yes, baud rates up to 115.2 kbps can be set through system configuration software.

Q5: What type of connector is used for RS-232?
A5: A standard D-sub 9-pin female connector is used for communication.

Q6: Is the ACM21 suitable for redundant communication setups?
A6: Yes, it can be paired with other modules to implement dual-port or redundant communication systems.

Q7: Does the module have isolation between power and communication circuits?
A7: Yes, optical isolation is provided to protect against electrical interference.

Q8: Can the ACM21 be installed alongside RS-485 modules?
A8: Yes, it can coexist with RS-422/485 modules without causing signal interference.

Q9: What are the power requirements?
A9: The module operates on 24 V DC ±10% and consumes 2.5 W.

Q10: How many communication channels does the ACM21 provide?
A10: The module has one dedicated RS-232 communication port.

---

Related Models

---

Popular Yokogawa Models

Related Models

---

Popular Yokogawa Models

Excellent PLC Co., Ltd. has a large number of brand new and original PLC and DCS spare parts, with more than 60 cooperative countries. All products are guaranteed for 1 year and delivered to you by high-quality express. We are committed to using the best products and the most favorable prices to meet the needs and friendship of our customers. We have won the trust of thousands of customers, including these excellent customers.

As for the delivery time, when we receive your order requirements, we will arrange for warehouse personnel to test and verify the products. After you place the order, we will send it to you within 24 hours.