Introducing the Aprilaire 8811 Protocol Adapter, designed specifically for Series 8870 Thermostats. This essential device comes equipped with a 7.5V AC, 500MA power supply, ensuring reliable performance. It seamlessly converts RS232 to RS485, making it a versatile addition to your setup. With a DB9 connector and cable included, installation is a breeze. The 8811 supports up to 32 communicating thermostats, allowing for extensive system integration. Plus, it enables installers to connect directly to Aprilaire thermostats using a Windows-based computer or laptop, facilitating hardware and communication verification. Enhance your thermostat experience today with the Aprilaire 8811!