MAXREFDES69#: Isolated RS-485 communication micro PLC card

The MAXREFDES69# is a dual-channel isolated RS-485/RS-422 micro-PLC reference design. Built in an industrial form factor, the design makes use of Maxim Integrated’s MAX14855 isolated RS-485/RS-422 transceivers with integrated transformer drivers for isolated data and power technology. On-board connectors allow the RS-485/RS-422 signals to be connected to an external bus and the on-board USB connector can be used to interface with the STM32 microcontroller. The MAXREFDES69# can be powered from a mico-PLC backplane or from the USB connector, simplifying the setup for fast and easy evaluation.

The board features a micro USB connector for quick connection to a PC for evaluation. No power supply is required as the board derives power from the USB connection. Refer to the Details tab for more information and performance data. As with all Maxim reference designs, hardware design files and firmware can be downloaded from the Design Resources tab. The board is available for purchase.

Features

• High-speed isolated RS-485 communication
• Isolated power and data on isolated transceivers
• Micro-PLC form factor
• Extended protection with TVS on RS-485 lines
• Device drivers
• Example C source code
• Test data

Applications

• Industrial control and automation
• Process control
• PLC