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https://www.digi.com/pdf/appnote_dnp3.pdf
Q: Does Digi support DNP3 over Ethernet / TCP/IP? A: Yes. See the explanations above for details. Native DNP over TCP support is not required to use Digi device and terminal server serial ports. Q: Are other protocols such as Modbus supported? A: Yes. Like DNP, most serial protocols work fine using either RealPort or sockets or a serial
http://www.xanthus-consulting.com/IntelliGrid_Architecture/New_Technologies/Tech_DNP3_Protocol_over_TCP-IP.htm
In 2000, the DNP Technical Committee defined a specification for carrying DNP3 over TCP/IP and UDP/IP. Because the WAN/LAN version is essentially the serial DNP3 encapsulated, this makes it possible to connect serial DNP3 devices to WAN/LAN DNP3 devices using terminal servers, IP packet radios, CDPD modems, and other networking technologies ...
https://www.dpstele.com/dnp3/understanding-traversing-troubleshooting-layered-communication.php
If the packet will be sent over a LAN/WAN, the three DNP3 layers are rolled up into the application layer. The assembled packet is wrapped in the Transmission Control Protocol (TCP) by the transport layer. This in turn is wrapped in the Internet Protocol (IP) by the internet layer.
https://control.com/forums/threads/dnp-3-0-over-ethernet-and-tcp-ip.14157/
Sep 08, 2003 · There is absolutely no problem with DNP3 over ethernet and TCP/IP. Its relatively newer than the serial standard, and very less RTU's are out there that support the same currently and deployed. However it is a very good standard, and a powerful communication medium.
https://www.power-grid.com/2007/08/01/substation-automation-and-communication-standards-iec-61850-and-dnp3/
DNP3 also operates over IP and Ethernet networks and is often referred to as DNP3 over IP. The DNP3 serial protocol is not modified in content when passed over IP; it is just modified as to how it works over the transport. This allows a mix of legacy serial devices and native DNP3 over IP devices to coexist on the same network.
https://www.automation.com/pdf_articles/1261002_DNP3WaterWastewaterWP.pdf
It should be noted that a vendor need not support all DNP3 protocol functionality. The compliance to DNP3 can be via three different levels — 1, 2 and 3. All vendors who support DNP3 must make available a ... • Scheduling accuracy — for example, when to switch over from duty to standby pump; generate test unso - licited messages at a ...
https://trianglemicroworks.com/docs/default-source/referenced-documents/Modbus_and_DNP_Comparison.pdf
Both protocols are widely used over a variety of physical layers, including RS-232, RS-422, RS-485, and TCP/IP. Modbus has a separate specification for use over TCP/IP (Modbus-TCP). With DNP, the protocol is simply encapsulated within TCP/IP. History Modbus was developed in the process-control industry by Modicon in 1979. It was
https://literature.rockwellautomation.com/idc/groups/literature/documents/pp/1766-pp001_-en-p.pdf
Modbus RTU/DNP3/ASCII protocol support • Ethernet port provides you with EtherNet/IP, DNP3 over IP and Modbus TCP/IP protocol support as well as web server and email capabilities • Built-in LCD with backlight allows you to view controller and I/O status, and provides a simple interface for messages, bit / integer monitoring and manipulation
https://www.dcbnet.com/datasheet/ednp3ds.html
DNP-3 has been extended to operate over ethernet using the IP protocol suite. This gateway converts between the DNP-3 IP protocol and DNP-3 Serial protocols transparently. Normal operation would consist of one or more ethernet based computers functioning as DNP-3 host and one or more DNP-3 slave devices (usually RTUs) connected serially to the ...
https://en.wikipedia.org/wiki/DNP3
The DNP3 protocol is compliant with IEC 62351-5. Some vendors support encryption via bump-in-the-wire for serial communications or virtual private networks for Internet Protocol-based communications. One of the most popular bump-in-the-wire methods began originally as AGA-12 (American Gas Association) in 2003, later becoming IEEE Std. 1711-2010.
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