RS-485 Connections

ION 7500 / ION 7600 User’s Guide

 

 

RS-485 Connections

Refer to the “Hardware Reference” chapter for the ION 7500 and ION 7600 meters’

RS-485 specifications.

RS-485 connections are made via the captured-wire connectors on the rear of the meter. Up to 32 devices can be connected on a single RS-485 bus. Use a good quality shielded twisted pair cable for each RS-485 bus, AWG 22 (0.5 mm2) or larger. The overall length of the RS-485 cable connecting all devices cannot exceed 4000 ft. (1219 m). The RS-485 bus may be configured in straight-line or loop topologies.

Straight-Line Topology

RS-485

COM

SH + -

RS-232 to

+

RS-485

-

Converter

SHLD

SHLD

 

SHLD

 

SHLD

Termination

 

 

 

 

 

 

 

 

 

 

RT Resistor

SHLD

+

SHLD

+

SHLD

+

RT

Loop Topology

RS-485

COM

SH + -

RS-232 to

+

RS-485

-

Converter

SHLD

SHLD

SHLD

SHLD

SHLD Termination

 

 

 

Block

SHLD

SHLD

SHLD

 

General Bus Wiring Considerations

Devices connected on the bus, including the meter, converter(s) and other instrumentation, must be wired as follows:

Connect the shield of each segment of the cable to ground at one end only.

Isolate cables as much as possible from sources of electrical noise.

Use an intermediate terminal strip to connect each device to the bus. This allows for easy removal of a device for servicing if necessary.

Install a ¼ Watt termination resistor (RT) between the (+) and (-) terminals of the device at each end point of a straight-line bus. The resistor should match the nominal impedance of the RS-485 cable (typically 120 ohms – consult the manufacturer’s documentation for the cable’s impedance value).

Page 128

Chapter 5 - Features and Applications

Page 127 Page 129
Page 128
Image 128
Multi-Tech Systems 7600, 7500 RS-485 Connections, General Bus Wiring Considerations, Straight-Line Topology, Loop Topology
Page 127 Page 129

7500, 7600 specifications

Multi-Tech Systems has established a strong reputation in the realm of communication technology, particularly known for its innovative products that cater to various industrial applications. Among their popular offerings are the Multi-Tech Systems 7600 and 7500 series, both designed to address the increasing demand for reliable, efficient, and flexible communication solutions in a connected world.

The Multi-Tech 7600 series is renowned for its robust design and multifunctional capabilities. One of its main features is support for multiple communication protocols, including cellular, wired, and wireless networks, ensuring seamless connectivity across different platforms. This versatility makes it an ideal choice for applications in industries such as transportation, healthcare, and logistics. The device is equipped with advanced signal processing technology, which enables it to maintain high-quality connections even in challenging environments.

On the other hand, the Multi-Tech 7500 series focuses more on the integration of IoT (Internet of Things) technologies. This series is particularly adept at connecting various smart devices, allowing for real-time data transmission and monitoring. Key features include extensive support for low-power wide-area network standards, making it an excellent option for applications that require long-range connectivity while minimizing power consumption. This characteristic is particularly advantageous for battery-operated devices deployed in remote locations.

Both series are built on versatile hardware platforms that allow for scalability and customization, catering to the unique needs of different industries. With embedded security features, including encryption and secure protocols, they provide a high level of protection for sensitive data, making them suitable for sectors that prioritize security, such as financial services and healthcare.

In terms of characteristics, both the 7600 and 7500 series are designed for ease of integration, featuring user-friendly interfaces and comprehensive development tools. This empowers developers to quickly deploy solutions and minimizes time to market. Additionally, the products offer extensive documentation and support, facilitating efficient onboarding for new users.

Overall, Multi-Tech Systems’ 7600 and 7500 series provide a powerful combination of features, technologies, and characteristics that make them standout choices for organizations looking to enhance their communication capabilities in a rapidly evolving digital landscape. Their capability to connect and interact with a wide range of devices and protocols ensures that businesses can adapt, innovate, and thrive in an increasingly connected world.
Top Page Image Contents