USB problem w/ Virtualbox 3.0.8 + Ubuntu 9.04 as host

if u have a problem w/ accessing your USB device ie. u're seeing a greyed area when u try to select any of your USB device..

try this first.. go to System > Administration > Users and Groups

OPC Datahub DataSim & DataPID connection error

i got an error while playing around with my OPC Datahub in my virtual machine. DataSim and DataPID simulate OPC data so that u can toy around. if u look at the status - it either shows "Fail to Connect" or "ECONNREFUSED"

thanks to the folk at Software Toolbox - the problem solved. it's so simple. both program requires tunneling feature of OPC Datahub to be enabled.

cheers

using Excel as datasource for OPC server with OPC Datahub

i asked myself how to get rid of manual report using MS Word currently being used by Operation team. i figured out that using Excel - we can export the data live to OPC server using OPC Datahub.

Datahub uses DDE feature of Excel and export it to OPC format.