How to set poll rate in IA OPC sever v5.1

[vijtin]

Hi all,

I m very new to labview(using LV7.0), using IA OPC server version 5.1. I have connected 3 slaves on serial communication bus having slave ID 1,4 n 8. So, what should be the value of poll rate, receive timeout and receive gap ?? How they are related to each other?????

Waiting for ur valuable reply

Thanks & Regards,

Ratna

[vijtin]

Hi,

In IA OPC server i have created 3 Modbus object for 3 devices, in each object pollrate is 0.6sec, receive timeout is 200msec n retry attemps is 0. Also the receive gap is 100bytes, with all these settings when i start communication  i get Garbled communication from modbus secondary:(11) Bad CRC error and some times No communication response from modbus secondary. On serial communication bus all 3 slaves are connected as Slave ID1, Slave ID2, and SlaveID3, so how the driver will send query and receive response from all 3 devices?? Will it first send query to Slave ID1 then slave id2 and then slaveid 3 and will receive the response in a same manner or in a different manner????  

Any suggestions will be valuable to me

Thanks n Regards,

Ratna