DH485 Insights

What is DH485?

DH485 is a proprietary industrial communication protocol developed by Allen-Bradley (now Rockwell Automation). It's a serial communication protocol used primarily to network Allen-Bradley programmable logic controllers (PLCs) and other industrial devices. It enables communication between PLCs, operator interfaces (HMIs), and programming terminals for tasks like data exchange, monitoring, and control. DH485 networks typically operate at relatively low speeds compared to modern Ethernet-based protocols.

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What other technologies are related to DH485?

DH485 Competitor Technologies

DH+

DH+ is a predecessor to DH485, serving a similar purpose for PLC communication. DH485 was a lower cost alternative to DH+.

mentioned alongside DH485 in 7% (151) of relevant job posts

DeviceNet

DeviceNet is a competitor as a fieldbus technology for industrial automation, offering an alternative for connecting devices.

mentioned alongside DH485 in 1% (94) of relevant job posts

ControlNet

ControlNet is a competitor, providing a higher-performance network solution for industrial automation compared to DH485.

mentioned alongside DH485 in 1% (63) of relevant job posts

RS232

RS232 is a competitor because it is another serial communication standard that could be used for point-to-point communication with a PLC, although DH485 is multidrop.

mentioned alongside DH485 in 1% (59) of relevant job posts

Ethernet/IP

Ethernet/IP is a competitor, offering a more modern and versatile networking solution for industrial automation.

mentioned alongside DH485 in 0% (55) of relevant job posts