489 Programmable Hardware Manual (PHM)
© Tibbo Technology Inc.
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.
Tibbo supplies two TPS2(G2)-compatible Tibbo BASIC applications for convenient
setup and testing of Bus Probes (see BP-Tester-UI and BP-Tester-Web).
Connectors and Controls
Note 1: When using an RS485 bus of substantial length, do not forget to use 120
Ohm termination resistors on both ends of the bus.
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