The Model 8020-30 Addressable Interface is designed to “daisy-chain” vibrating wire sensors on a single 4-conductor cable, using the Modbus® RTU protocol over an RS-485 connection. It is particularly useful for reducing cable runs in multipoint systems, incremental extensometers, and for applications where many sensor cables might compromise a grout or cement bond, e.g. on a soil nail. The system features state of the art signal conditioning and digital addressing to provide a measuring system comprising of up to 100 sensors along one common cable (the maximum number of sensors is determined by overall cable length and power supply: please contact GEOKON for more information). Readout is achieved with the FPC-2 Field PC, 8600 Series Dataloggers or via a PC application.

Specifications
Range: 400 Hz to 5000 Hz
Accuracy: 0.005%
Resolution: better than 0.005 Hz
Sweep/Read Duration: < 500 ms
Communication: Modbus RTU over RS-485 @ 9600 baud
Temperature Range: –40°C to +70°C

Geokon, Incorporated, 48 Spencer Street, Lebanon, New Hampshire, 03766 · USA. Tel.: 1(603)448-1562, FAX: 1(603)448-3216, e-mail: info@geokon.com