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12 ADI | Energy Storage Solutions Signal and power iCoupler isolated RS-485 repeater. iCoupler isolated RS-485 transceiver with added IEC 61000-4-5 surge robustness on the A and B bus pins. Drop-In iCoupler Isolation Solution for Existing Solar PV Networks For existing installations of solar inverters, which do not include iCoupler isolation robustness on the communications port, the iCoupler isolated RS-485 repeater (Figure 4) is a powerful drop-in solution. The compact, signal, and power iCoupler isolated RS-485 repeater delivers robust isolation protection against electrical noise in electromagnetic capability (EMC) harsh solar environments. The iCoupler isolated RS-485 repeater design consists of two RS-485 transceivers and two high-speed comparators. The ADM2587E is a fully integrated signal and power isolated data transceiver with ±15kV ESD protection, and is suitable for high-speed communication on multipoint transmission lines. The ADM2587E includes an integrated, isolated DC-to-DC power supply, which eliminates the need for an external DC-to-DC isolation block. An RS-485 repeater requires flow control, which is essential for controlling the direction of communication on the RS-485 bus. Using the ADCMP600 high-speed comparator allows high-speed flow control and directionality on the ADM2587E logic pins, which results in a reliable communication system. For complete design guidelines, refer to AN-1458 Application Note Isolated RS-485 Repeater with Automatic Direction Control. iCoupler Signal Isolated RS-485 with Additional EMC Robustness When designing an EMC communications interface, the circuit designer is often faced with a design and test iterative cycle. The circuit needs to be designed to meet system-level EMC standards and customer requirements. System-level IEC standards, such as IEC 61131-2 for industrial automation, specify varying levels of protection against IEC ESD, EFT, and surge, as well as immunity to radiated, conducted, and magnetic disturbances. Analog Devices iCoupler signal isolated RS-485 includes additional certified EMC protection against these noted disturbances, reducing time to market for designs that need to meet strict regulatory targets. In particular, the ADM2795E RS-485 transceiver integrates isolation robustness and EMC protection, which saves significant printed circuit board (PCB) board space for the solar PV communication port interface (Figure 5). The ADM2795E is a 5kV rms signal isolated RS-485 transceiver that features up to ±42V of AC-to-DC, peak bus overvoltage fault protection on the RS-485 bus pins. The device integrates Analog Devices iCoupler technology to combine a 3-channel isolator, RS-485 transceiver, and IEC electromagnetic compatibility (EMC) transient protection in a single package. 4 5