How can I connect to the multiple Slave stations by Modbus RTU protocol?

Using the ie/ig series HMI, when the user want to connect devices by RTU, maybe facing with the following question:

1. The all addresses are right format, if just connect to the one Slave, it didn't timeout at all;

2. But when connect to the more than one Slave, the HMI will start to timeout;

So the solution is below according to this situation:

1. Make sure your software version is updated to the latest; 

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2. Add a Delay Time 5ms here;