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The system is called balanced, because the signal on one wire is ideally the exact opposite of the signal on the second wire. A balanced system uses two wires, other than ground, to transmit data. Simply put, this means there are two wires, other than ground, that are used to transmit the signal.įigure 1. RS-485 is designed to be a balanced system. The distance and the data rate with which RS-485 can be successfully used depend a great deal on the wiring of the system. RS-485 is designed to transmit this information over significant lengths, and 1000 meters are well within its capability. Data rates can be up to, and sometimes greater than, 10Mbps. RS-485 transmits digital information between multiple locations. The suggestions here, however, are by no means inclusive of all the different ways that a network can be designed. These guidelines and sound engineering practices are the basis of this note. The specification does, nonetheless, give some guidelines. The RS-485 specification (officially called TIA/EIA-485-A) does not specifically explain out how an RS-485 network should be wired. Independent lab tests commissioned by our Romanian distributor found BP#02's measurement accuracy for relative humidity to be ☓.8% or better.This application note provides basic guidelines for wiring an RS-485 network.Independent lab tests commissioned by our Romanian distributor found BP#02's measurement accuracy for ambient temperature to be ☐.5☌ or better.Independent lab tests commissioned by our Romanian distributor found BP#01's measurement accuracy for ambient temperature to be ☐.45☌ or better.The actual measurement range is limited by the operating temperature range of the Bus Probe itself, which is from -40☌ to +85☌.Internal firmware is upgradeable through the RS-485 port.Operating temperature range: -40☌ to +85☌.Dimensions, excluding connectors (L x W x H): 40 x 36 x 19mm.Measurement accuracy for each axis: 0.1G.Measurement resolution for each axis: 0.003G.range for valid humidity measurements: 5☌ to 50☌ BP#02 (ambient temperature and humidity sensor).Half-duplex (two-wire) RS-485 interface.
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We also offer a TPS-based test kit (see BP-TEST-KIT below), which consists of four Bus Probes (one of each type), a TPS2L(G2) preloaded with the BP-Tester-UI app, and the necessary cables. 2-compatible Tibbo BASIC applications for the setup and testing of Bus Probes are available: Tibbo also offers a browser-based test kit (see BP-TEST-WEB-KIT below), which consists of four Bus Probes (one of each type), a Web485 board, and the necessary cables.
#MODBUS RTU RS485 CABLE PC#
(you will need to connect the probes to your PC via our Web485 board). The wide supply voltage range also means that you can allow for a significant voltage drop along the bus (e.g., when using a bus cable of considerable length).īus Probes are very compact (measuring only 40x36mm externally) and sport an attractive look and feel.Įach sensor has two mounting holes for attaching it to walls and other surfaces.īus Probes can be configured and tested using our web-based test app (for example, the 5V output of Tibbit #00-3) or standard 12V power supplies.
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The probes communicate using the standard Modbus RTU protocol.Īt the moment, Tibbo offers four types of probes: an ambient temperature sensor (BP#01), an ambient temperature and humidity sensor (BP#02),Īn ambient light sensor (BP#03), and a three-axis accelerometer (BP#04).īus Probes are typically wired to a twisted pair cable that distributes power and carries RS485 "+" and "-" lines.Īll probes accept a supply voltage from 4V to 15V, allowing you to power them with 5V sources Bus Probes are a family of environmental sensors with an RS485 interface.