The THVD8000 and 8010 are RS-485 compliant transceivers that use OOK modulation on the input data to transmit data across a power line. This converts a logic 0 into a pulse train with a pre-selected frequency and a logic 1 into a flat output (V_B – V_A ~0V). Due to this part’s added features the pinout is different from a standard half duplex RS-485 device; a pinout is shown in Figure 2-1 for both devices.

Figure 2-1 THVD80x0 Pinout

The similarities between a standard RS-485 half duplex transceiver and the THVD8000 and THVD8010 parts can be seen in Figure 2-1. Pins 1, 4, 5, and 8 remain similar across most RS-485 devices. Pins 8 and 5 are the power connections to the IC, while pins 1 and 4 are the single ended RX output and TX inputs respectively. The B and A pins are still used for differential communication as in other RS-485 devices and still conform to the 1.5 V differential voltage over a 54 Ω; however, the A/B pins use OOK modulation instead of a typical pulse train used in RS-485.