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Nortech Systems RS-422/485, XUSR, RS-232/TERM, XSYS manual Power Supply and the DeviceNet Bus

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

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Appendix B - Adept DeviceNet

Pin 4

Pin 5

Terminating

Resistor

Figure B-5. Example of a Terminating Resistor Installation on a DeviceNet Bus

Power Supply and the DeviceNet Bus

The DeviceNet network allows distribution of power supplies on the network cable system. Follow these general rules to achieve a safe and reliable operation:

•Use power supplies rated at 24V

•Minimize installation problems by using one power supply with sufficient current to operate all the attached nodes. This must comply with the national and international safety standards.

•Make sure that each power supply incorporates current limit protection.

•Make sure each power supply is temperature compensated.

•Provide over current protection for each segment of your DeviceNet cable installation.

NOTE: Adept does not supply the 24V operating voltage for the DeviceNet bus on the SmartController or any other Adept component.

Power Capabilities of a DeviceNet Cable System

WARNING: The DeviceNet specification requires that the CAN_H and CAN_L signal lines tolerate voltages up to 18V. Since the supply voltage exceeds 18V, improperly wiring the supply voltage to these signal lines may cause permanent damage.

A DeviceNet cable system has several power rating constraints. The cable type and the length of the cable specify the maximum current on a cable. Thick and thin cable have:

•24 VDC power rating

•Optional power-supply tabs

If the power supplies are equipped with Schottky diodes, the optional power supply tabs must be protected from bus back-feeding of current among the power supplies on the bus. We also recommended the use of fuse protection for every trunkline in the cable system.

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Adept SmartController User’s Guide, Rev. E

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Nortech Systems RS-422/485, XUSR, XSYS Power Supply and the DeviceNet Bus, Power Capabilities of a DeviceNet Cable System
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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.