LabVIEW drivers - Validyne P56 pressure meter

Introduction

The P56 pressure meter can be read through an analog output signal or through a RS485 connection. The RS485 connection can be supplied by a USB-to-RS485 cable from FTDI.

This page doesn't present a complete driver but it shows how the serial protocol can be implemented.

Sample program

The provided program uses 2 commands. The first is the broadcast command that can be used to set the address of the pressure meter although using the FTDI cable allows for 1 pressure meter only. The second command, which requests a pressure reading, is one of the six host commands.

Links

For more information on the Validyne P56 pressure meter and the FTDI USB-to-RS485 cable check the following links:

• Validyne P56-USB Digital Pressure Transmitter
• Validyne P56 Serial Protocol
• FTDI Virtual COM Port drivers

Downloads

 valydine.zip

Remarks

• The VIs have been made with labVIEW 2009 SP 1
• Using the RS485 connection the pressure meter can be read no faster than 20 times per second