RS-485 Network

EIA RS-485 is industry’s most widely used bidirectional, balanced transmission line standard. It is specifically developed for industrial multi-drop systems that should be able to transmit and receive data at high rates or over long distances.

The specifications of the EIA RS-485 protocol are as follows: -Max line length per segment: 1200 meters (4000 feet) -Throughput of 10 Mbaud and beyond

-Differential transmission (balanced lines) with high resistance against noise

-Maximum 32 nodes per segment

-Bi-directional master-slave communication over a single set of twisted pair cables

-Parallel connected nodes, true multi-drop

ADAM modules are fully isolated and use just a single set of twisted pair wires to send and receive! Since the nodes are connected in parallel they can be freely disconnected from the host without affecting the functioning of the remaining nodes. In industry shielded twisted pair is preferable due to the high noise ratio of the environment.

When nodes communicate through the network, no sending conflicts can occur since a simple command/response sequence is used. There is always one initiator (with no address) and many slaves (with address). In this case the master is a personal computer that is connected with its serial, RS-232, port to an ADAM RS-232/RS-485 converter. The slaves are the ADAM I/O modules. When modules are not transmitting data, they are in listen mode. The host computer initiates a command/response sequence with one of the modules. Commands normally contain the address of the module the host wants to communicate with. The module with the matching address carries out the command and sends its response to the host.

E-2 ADAM 4000 Series User’s Manual

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Advantech ADAM 4000 user manual RS-485 Network
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ADAM 4000 specifications

Advantech's ADAM 4000 series is a line of versatile distributed I/O devices designed to bridge the gap between field devices and control systems. Known for its robust design and flexible configurations, the ADAM 4000 series is ideally suited for various industrial applications, including process monitoring, automation control, and data acquisition.

One of the notable features of the ADAM 4000 series is its modular architecture. This flexibility allows users to customize their setup by selecting specific I/O modules tailored to their application needs. The series supports a wide range of input and output types, including analog, digital, and relay outputs, making it a comprehensive solution for monitoring and controlling various parameters in a system.

In terms of communication, the ADAM 4000 series boasts multiple connection options, including RS-232, RS-485, and Ethernet. These communication protocols ensure seamless integration with existing control systems and enhance the ability to deploy in various network configurations. Furthermore, the series supports several industrial protocols such as Modbus, enabling easy integration with SCADA systems or PLCs.

One of the standout technologies in the ADAM 4000 series is the use of advanced data acquisition methods. This allows users to capture precise data from sensors and other field devices, which can then be processed and analyzed to improve operational efficiency. The built-in diagnostics features help in quick troubleshooting, minimizing downtime and maintenance costs.

The ADAM 4000 devices are designed for rugged environments, featuring a wide operating temperature range and a high level of resistance to electromagnetic interference. This durability makes them suitable for various industrial conditions, from factory floors to remote monitoring stations.

Additionally, the ADAM.NET SDK provided by Advantech simplifies the development process for software applications. This toolkit allows engineers to build custom applications that effectively interact with the devices, thus enhancing the overall functionality and user experience.

In summary, the Advantech ADAM 4000 series stands out as a reliable and flexible solution for industrial automation needs. Its modular design, diverse communication protocols, advanced data acquisition capabilities, and rugged build quality make it an ideal choice for organizations looking to enhance their monitoring and control systems. Whether in manufacturing, energy management, or environmental monitoring, the ADAM 4000 series offers a robust foundation for any industrial application.
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