DeviceNet Physical Layer and Media

Connecting DeviceNet Hardware to the Adept DeviceNet Scanner

To connect DeviceNet components to the Adept DeviceNet Scanner, connect a dropline to

the female Micro-style 12 mm thread DIN connector on the front of the SmartController. Then you must configure the DeviceNet Scanner correctly using the CONFIG_C

program. See the Instructions for Adept Utility Programs for information on using CONFIG_C.

See the DEVICENET monitor command in the V+ Operating System Reference Guide for detailed information about the DeviceNet software setup in V+.

NOTE: Adept does not supply 24V on the SmartController to power the DeviceNet bus. A separate power supply is required to power the components on the DeviceNet bus.

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.

B.4 DeviceNet Physical Layer and Media

The DeviceNet physical layer and media specifications are published in the ODVA manual, chapter 9, volume 1. It describes possible topologies and components of the physical layer of the DeviceNet.

Figure B-1shows several possible topologies. The DeviceNet specifications also specify system grounding, mixing of thick and thin cable media, termination, and power distribution.

The basic topology is the trunkline-dropline topology. This topology uses separate twisted-pair buses for the distribution of signals and power. The specifications allow trunklines and droplines made of thick or thin cable. The baud rate, maximum distance from end-to-end of the network, and cable size are dependent on each other. See Table B-2 on page 119 for further details.

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Nortech Systems RS-232/TERM, XUSR, XSYS DeviceNet Physical Layer and Media, Adept SmartController User’s Guide, Rev. E 117
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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.
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