1.Introduction

geokon’s Model 8960-01C Addressable Vibrating Wire (VW) Interface enables vibrating wire sensors to be accessed by equipment that normally would be incapable of interfacing with a VW sensor.

The 8960-01C interface includes separate, dedicated channels for reading both the vibrating wire and the thermistor built into the sensor.

When fitted with 8960-01C, the VW sensor is queried via industry standard Modbus Remote Terminal Unit (RTU) protocol over a simple half-duplex RS-485 connection. The sensor is excited and measured by the interface, and the digitized measurement is then read via Modbus RTU over the RS-485 bus. Readings are accessed via their physical connection on the reading device.

 

Figure 1: 8960-01C Addressable VW Interface

 

 

Figure 2: Sensor connected to 8960-01C interface