Product Introduction
The Yokogawa ACM22 RS-422/485 Communication Module extends serial communication capability within Yokogawa control architectures, enabling stable long-distance and multi-device connectivity. By supporting differential signaling standards, it improves reliability in electrically noisy industrial environments.
This module is particularly suited for distributed installations where multiple field instruments must communicate with a central controller over shared serial lines. Its compact form factor and structured integration make it an effective solution for legacy system integration and industrial protocol communication.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | RS-422/485 Communication Module |
| Model | ACM22 |
| Communication Standards | RS-422 / RS-485 |
| Network Type | Point-to-point or Multi-drop |
| Application | Industrial serial communication |
| Configuration | Configurable baud rate, parity, stop bits |
| Installation | Control cabinet mounted |
| Operating Environment | Industrial indoor installation |
| Dimensions (H × W × D) | 125 × 130 × 248 mm |
| Net Weight | 0.14 kg (approx. 0.31 lb) |
Application Landscape in Industrial Networks
The ACM22 RS-422/485 Communication Module is developed to provide robust multi-point serial communication within Yokogawa automation platforms. Supporting RS-422 and RS-485 standards, it enables reliable long-distance and multi-drop data exchange between controllers and field devices.
It is typically deployed in:
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Distributed control systems (DCS) requiring serial field device integration
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Multi-drop analyzer communication networks
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Remote I/O communication over extended cable runs
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Power and utility automation panels
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Industrial protocol-based device networks (Modbus RTU, custom serial protocols)
In environments where Ethernet infrastructure is impractical or legacy serial networks remain active, the ACM22 ensures stable and noise-resistant communication.
Technical Strengths and Integration Advantages
Compared to RS-232 modules, RS-422/485 offers improved noise immunity and longer transmission distance. The ACM22 leverages these advantages for industrial reliability.
Long-Distance Communication Capability
RS-422/485 supports extended cable runs compared to RS-232, ideal for distributed field layouts.
Multi-Drop Network Support
RS-485 enables multiple devices to share the same communication bus.
Differential Signaling Stability
Balanced transmission reduces susceptibility to electromagnetic interference in industrial settings.
Flexible Protocol Handling
Compatible with standard industrial serial protocols such as Modbus RTU.
Seamless System Integration
Designed for structured integration within Yokogawa control platforms.
Technical FAQs
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What communication standards are supported?
The module supports both RS-422 and RS-485 serial communication standards.
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What is the difference between RS-422 and RS-485 operation?
RS-422 typically supports point-to-point communication, while RS-485 supports multi-drop bus configurations.
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Is long-distance communication supported?
Yes, RS-422/485 supports significantly longer cable lengths than RS-232.
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Can multiple devices share one communication line?
Yes, in RS-485 mode, multi-drop configurations are supported.
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Is differential signaling used?
Yes, differential transmission improves noise immunity.
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Can it interface with third-party Modbus RTU devices?
Yes, provided communication parameters are properly configured.
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Are termination resistors required?
Proper bus termination is recommended in RS-485 networks to prevent signal reflection.
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Is isolation provided?
Isolation characteristics depend on system configuration and installation practices.
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Can baud rate and parity be configured?
Yes, standard serial communication parameters are configurable.
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Is it suitable for harsh industrial environments?
Yes, it is designed for cabinet-mounted operation in industrial control systems.
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