RS485 Modbus Sensors ("Bus Probes")
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BP#01 sensor shown
Bus Probes are a family of environment sensors with an RS485 interface. The Probes communicate using standard Modbus RTU protocol.
At the moment, Tibbo offers four types of probes: ambient temperature sensor (BP#01), ambient temperature and humidity sensor (BP#02), ambient light sensor (BP#03), and 3-axis accelerometer (BP#04).
Bus Probes are typically wired to a twisted pair cable, which distributes power and carries RS485 "+" and "-" lines. All probes accept the supply voltage in the 4V to 15V range. This allows you to power them from 5V sources (for example, the 5V output of the Tibbit #00-3), as well as standard 12V power supplies. Wide supply voltage range also means that you can allow for a significant voltage drop along the bus, i.e., use a bus cable of considerable length.
BP sensors are very compact (external dimensions only 40 x 36mm) and sport an attractive look and feel. Each sensor has two mounting holes for attaching it to walls and other surfaces.