Bad data displayed in Server explorer

[serf408]

When I use the Server explore to monitor the data, I found it just displayed " quality bad value", data "xxx", the connection was there, and the lookout Procotol Driver told me that "Modbus exception response 2 (illegal data address)" so how can fix this problem? I am using NI RS485 to connect to a Dynisco upr 700 instrumnet, which has a modbus communication procotol. I can use a software modscan32 from win-tech to read the right information. Please give me any suggestion. Thanks!

[Khalid]

You may want to check the address you've specified for your instrument in the Modbus Object. The exception response 2 means (from the Modbus standard): "The data address received in the query is not an allowable address for the slave."

As long as you have a comm alarm in the Lookout Protocol Driver, your Server Explorer will give bad data.

Sorry for not being of much help.

Regards,

Khalid