I have not found the tips I was looking for in the forum page, so I ask if you can help.
For a simple program like the following one, I can read modbus registers, but the RS485 Sub leds are always blinking like the TB is continuously communicating with the slave.
Excellent question, we have been asked about this a few times now. In the system as it is now, the T3 controller polls when it has time between its other tasks. It will be helpful if there’s a default as we have now, so folks dont have to think about it, but also a setting to those who care about these things. We will add this to the todo list for the near future.
After you set T3 to Master mode, other Modbus devices on the RS485 Sub port are also masters and send read and write commands to T3. At this time, T3 will automatically change its Sub port to Slave. Then other devices can read and write T3 normally. If you are sure that you are fixed as Master, you can write the 91 register of T3 to 1.
In general, the modbus bus cannot have multiple masters. Please confirm that there are no other Modbus Master devices on the bus. Make sure there’s only one Master.
In case there are multiple masters on the RS485 bus, you can force T3 to be set to Master by writing T3’s register 91 to 1.
Hello,
While waiting for these modifications I tried with the commands TIME-ON, TIME-OFF and WAITING to manage a 10 second pause between two polling but it did not succeed. Could you suggest me a way?
The polling is done automatically in the background as one of the tasks running on the controller. Unfortunately there’s (currently) no method to control the polling activity in a user program.