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Nortech Systems XSYS, XUSR, RS-232/TERM, RS-422/485 manual Length of Dropline Maximum Current

Models: RS-422/485 XSYS XUSR RS-232/TERM

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DeviceNet Physical Layer and Media

The maximum current rating of a thick cable trunk line is 8A.Verify that this complies with your national and international standards. It might be necessary to limit the maximum current to a lower value if standards in the U.S. or Canada apply. The maximum current value is a theoretical value. The cable size supports a higher current than 8A. Depending on the topology of nodes relative to the power supply, higher currents might be possible. See the DeviceNet technical specifications for further information.

The maximum current rating of a thin cable trunk line is 3A. If you use the thin cable on a long line, the resistance of the cable decreases the maximum current value. See Table B-5and the DeviceNet technical specifications and for further information.

Table B-5. Maximum Current on a Dropline Relative to its Length

Length of Dropline

Maximum Current

 

 

 

 

1.5 m (5 ft.)

3A

 

 

2.0 m (6.6 ft.)

2A

 

 

3.3 m (10 ft.)

1.5A

 

 

4.5m (15 ft.)

1A

 

 

6m (20 ft.)

0.75A

 

 

For the calculation of the maximum current at a specific length, use the following formula:

4.57 i = ---------

l

Where:

l= Length of the drop line in meters (m)

i= Maximum current in amps

This calculation applies to the sum of the currents of all the nodes on the selected drop line. The length (l) is not the cumulative length of the drop line; it is the maximum distance from any node on the dropline to the trunk line.

It is important to note that voltage differences between the V– and V+ conductors need to be between 11V and 25V. The common-mode voltage between any two places on the V– wire must not exceed 5V.

Adept SmartController User’s Guide, Rev. E

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Nortech Systems XSYS, XUSR, RS-232/TERM Length of Dropline Maximum Current, Adept SmartController User’s Guide, Rev. E 123
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RS-422/485, XSYS, XUSR, RS-232/TERM specifications

Nortech Systems offers a comprehensive suite of serial communication solutions, including RS-232/TERM, XUSR, XSYS, and RS-422/485 interfaces. These products are designed to facilitate reliable and high-speed data transmission in various industrial applications, making them essential for connecting devices in automation, telecommunications, and data acquisition systems.

The RS-232/TERM interface is a widely adopted standard for serial communication, known for its simplicity and robustness. It supports point-to-point communication over relatively short distances, typically up to 50 feet. Key features include a maximum baud rate of up to 115.2 kbps, error-checking capabilities, and a straightforward connection process, making it ideal for connecting peripheral devices like printers, modems, and barcode scanners.

Building on the RS-232 standard, the XUSR and XSYS devices offer enhanced functionalities and flexibility. XUSR, for instance, supports not just traditional RS-232 connections, but also protocol conversion for various serial interfaces, facilitating seamless integration of legacy systems with modern networking technologies. It is particularly useful in environments where multiple protocols need to be managed simultaneously.

XSYS is designed for more complex applications and supports advanced communication features such as multi-drop configurations, enabling it to connect multiple devices on a single bus. This makes it suitable for extensive industrial networks where space and wiring complexity need to be minimized. Synchronous and asynchronous data transfer modes ensure that the XSYS is adaptable for both real-time data collection and standard command-response applications.

On the other hand, RS-422/485 interfaces excel in long-distance communication, allowing for data transmission over distances up to 4,000 feet. They are designed for multi-point connections, supporting up to 32 devices on a single bus through differential signaling, which enhances noise immunity. These characteristics make RS-422/485 particularly well-suited for environments with electromagnetic interference, such as factories or subways.

Nortech Systems’ serial communication solutions emphasize reliability, ease of use, and versatility. With their commitment to high performance and user satisfaction, these interfaces provide critical connectivity in today’s increasingly automated and interconnected world. Whether in data centers, manufacturing setups, or remote sensor networks, Nortech's offerings stand out for their reliability, efficiency, and adaptability, ensuring effective data communication across diverse applications.