Vibrating Wire Digital Converter

Model : VW-RS485

It is precise smart converter from VW analog input to Digital output RS485.
A node can read 4EA VW and 4EA Temperature signals.

The VWRS485 signal converter can read out all types of vibrating wire transducers of sweep Hz range 450 to 6000.

It is able to connect multiple daisy chain VWRS485 signal converter up to 32EA so It helps easy many VW data collecting through one line communication cable.

Simply input, A PC can read and record 128EA VW and Temperature.
128EA = 4channels x 32nodes

Compact design allows stable data gathering. In particular, individual signals can be collected filtering to make low noise level.

The end user can record data direct to a PC or collect data through a data logger which can support Modbus RTU function. There are two mode before placing an order.

Modbus RTU mode / Geovan PC program

Monitoring Structure

Geovan PC Program allows you to automatically collect and record data at regular intervals. Modbus RTU can be used by connecting to a data logger, RTU, PLC or PC. You must choose the protocol between Geovan PC or Modbus before shipping the product. The Rom writer sold separately helps to set up firmware by yourself in case of amended internal protocol. If you set up FTP on your PC, You can have access into the data at any time even from remote places.

Specification

PCB Size	80 x 58 x 11mm
Maximum number of connectign converters by Daisy Chain	32Ea
Number of Reading Channel(Differential Measurement)	Vibrating Wire 4EA, NTC Thermistor 4EA
Selectable Input Power Level	12Vdc or 5Vdc selection, Default 12Vdc
Adjustable Reading Interval	1minute to 720minutes
Selectable Reading Count for Average	1 to 5 times

PCB Details

#1 for vibrating Wire Sensor Wiring

• +,- for VW Sensor Signal
• T1, T2 for Temperature Reading
• No Polarity of VW and Temperature
• E for Shield Wire Earth(Ground)

#2 for RS485 Signal Wiring(Output

• +,- for power supply 8Vdc to 15Vdc
• It has polarity. Becareful wiring +,-
• A+B- for RS485 signal converter
• E for Shield Wire Earth(Ground)

#3 for Power Selection

• 12Vdc power range from 8Vdc to 15Vdc
• 5Vdc should be constant 5Vdc exactly.
• If not, the PCB will be serious damaged.

#4 for Firmware Coding Port by Rom writer

• Send Modbus RTU or RS485 geovan protocol through the port.

Mode of Vibrating Wire

Display mode	Item	Calculation	Units	Frequency Sweep(Hz)
A	All	Frequency	μ seconds	450~6,000
B	Load cell, TPC, Piezometer	F2 x 10-3	Digits	1,200~3,500
C	Arc weldable strain Gauge	F2 x 10-3 x 4.062	μStrain(ε)	450~1,000
D	Embedment strain Gauge	F2 x 10-3 x 3.304	μStrain(ε)	450~1,000
E	Spot weldable strain Gauge	F2 x 10-3 x 0.39102	μStrain(ε)	1,000~3,500
Temperature	NTC 3kΩ at 25°C	Table Sheet	Thermistor