RS232/RS485 Gateway Timer version for Airkit, it is adopted RS485 isolation technology, two modes: one is connected device to control HDL Buspro device from RS232, and the other mode is connected device to control HDL BUS pro device from RS485. Also, you can control devices in RS232 or RS485 from HDL Buspro. work with HDL-MAIR-Q/H.10  Airkit Air quality sensor