How can I edit the database in Lookout OPC Modbus driver OPC sever with the address that has a write attribute?

[serf408]

When I use Lookout Modbus driver OPC to communicate with my instrumnets, I edited the database number such as 41202 that has a Write attribute in my instrumnet manual, the OPC explorer got bad data, and the OPC server gave the illegal address alarm, when I input the address such as 41203 that has R/W attribute, it worked very well. Is there a way to fix this problem. When I used other OPC server, there was no this kind of problem. Thanks!

[cfarmer]

Is the register that you are trying to access 16 or 32 bit? You would get an illegal address if you tried to read a 32 bit register and were offset by 16 bits.

[serf408]

Thanks for your suggestion. I checked the Modbus manual of my instrument, the register is 16 bit. I tried to edit the data according to the Modbus data member in lookout modbus drivere server for several different member, but the OPC still gave me the illegal address. I think the problem may be produced by their attribute, for the address 1201 and 1202, they have the write attribute, for other addresses, they have W/R attribute, and they can be read or write through Lookout OPC server perfectly. when I used the demo OPC server from other company, it can work well, but it is not convinient for me to use Labview when I use that software. I prefer NI Lookout OPc server. I am using the Lookout 4.5. I am wondering whether the Lookout has some shortcoming when I
use the Modbus driver. Please give me any suggestion, is there any newest version of Lookout OPC sever? Thanks!