PowerLogix COM128 Supplying Power to the RS-232 DTR PIN, Rule of Thumb

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COM128 Installation and Operation Manual

SchneiderElectric

CALCULATING OVERALL CABLE LENGTH

When determining the overall length of an RS-485 communica- tion straight-line or loop connection, it is important to account for all cable segments. For example, when RS-485 connections to the device are made via an intermediate terminal block (Figure 4.3.2), the lengths of cable between the device and the terminal block must be added to the total cable distance. This length is equal to 2 times distance X in the diagram.

CONNECTION METHODS TO AVOID

Any device connection that causes a branch in the main RS-485 bus should be avoided. This includes star and tee (T) methods. Refer to Figure 4.3.3b for examples. These wiring methods will cause signal reflections that may cause interference.

RULE OF THUMB

At any connection point on the RS-485 bus, no more than two (2) cables should be con- nected. This includes connection points on instruments, converters, and terminal strips. Following this guideline ensures that star and tee connections are avoided.

5SUPPLYING POWER TO THE RS-232 DTR PIN

The COM128 is shipped configured for use with devices that supply their own power.

Some RS-232 devices, such as short-haul modems and line drivers, receive their power from the DTR pin of the RS-232 line. The COM128 can be configured to support these devices, supplying 5 VDC @ 10 mA to the DTR pin of its DTE or DCE port.

To configure the COM128 to supply power on the DTR pin, follow this procedure:

1.Disconnect all power and communications connections to the COM128.

2.Remove the two case screws, and lift the top half of the case away from the base of the unit.

3.Locate the 3-pin jumper blocks J1 and J2. For normal use, these are configured with pins 2 and 3 connected. Change each jumper so that pins 1 and 2 are connected.

4.Replace the cover and re-install the screws.

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Contents PowerLogic COM128 Page Conventions Table of Contents COM128TM Introduction RS-232PANEL Physical Features1 RS-485 Flow Control ConfigurationConfigurationswitches Mode DescriptionsSpeed Compensation Repeater Installation DC Supply ConnectionsDirectconnection to a Computer Connection to a Modem 3 RS-232 Connection to ModemRecommendedtopologies General BUS Wiring ConsiderationsRS-485 BUS Connections ConvertorconnectionsRS-485 STRAIGHT-LINE Topology Rule of Thumb Supplying Power to the RS-232 DTR PINDo not Technical Specifications COM128 Options UNI OptionIND Option COM128 1 -IND Option Industrial P/S Page Page Page PowerLogic COM

COM128 specifications

The PowerLogix COM128 is an advanced, high-performance communication module designed to facilitate robust and efficient data exchange in various applications. It is particularly favored in sectors such as industrial automation, smart grid systems, and telecommunication networks.

One of the main features of the COM128 module is its flexibility in communication protocols. It supports various standards including Modbus, CAN, and Ethernet/IP, which enables seamless integration into different systems. This adaptability is crucial for industries that employ diverse equipment and protocols, allowing the COM128 to serve as a single communication interface.

The COM128 also boasts impressive data transmission speeds, typically reaching up to 115.2 kbps, ensuring that even large volumes of data can be exchanged quickly and reliably. This is essential in environments where real-time data processing and timely decision-making are critical. The module is capable of handling multiple simultaneous connections, enhancing its efficiency and throughput.

In terms of technology, the COM128 is built on a compact and robust architecture that guarantees durability and longevity. It features advanced error detection and correction mechanisms, which help maintain data integrity during transmission. Additionally, the module is equipped with an integrated power management system that optimizes energy consumption, making it an eco-friendly choice for businesses looking to reduce their carbon footprint.

The characteristics of the PowerLogix COM128 further enhance its appeal. It is designed to operate in a wide range of environmental conditions, with an operational temperature range from -40°C to +85°C. This makes it ideal for deployment in harsh industrial settings where extreme temperatures can be a concern. Furthermore, the module is compact and lightweight, allowing for easy installation and integration into existing systems without the need for significant modifications.

A user-friendly interface accompanies the COM128, providing intuitive configuration options and diagnostics tools. This ease of use reduces the learning curve for engineers and technicians, thereby accelerating project implementation times.

In summary, the PowerLogix COM128 is a versatile and powerful communication module that meets the needs of various industries. With its multi-protocol support, high data transmission speeds, advanced technologies, and robust characteristics, it stands out as a reliable solution for efficient data communication in modern applications.
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