Modbus signal - reduce signal length

[azwhoony]

Hi All,

Hope can get some answers from you guys. Thanks in advance.

I'm using Modbus protocol for almost all application in my projects and I use Labview modbus library to help me on this.  Since there are a lot of IOs multidropping in 1 communication port, I'm trying to get the fastest response from all slaves. After analyzed the signals using an osciloscop, I found that my program takes about 100-200ms to read from 1 slave before giving a new modbus query. The break length between the receive signal and the new query is around 45ms. Is it possible to reduce this duration and how? 

Looking forward for any opinion on this. Thanks.

[Zinnium]

Azwhoony,

I sent you an email explaining this.

[Albert.Geven]

Please post also to the forum.

[Zinnium]

This is a DB-9 problem that has always existed...  It deals directly with how the PC handles the DB-9. 

Modbus its self normally adds up to 50ms+ for it to do its thing.  

USE THE USB!!!!