Frequently Asked Questions
I want to use Modbus to communicate to my Advantage Sentra Model SK-1035HE. So far I've been able to read the set point but I haven't been able to change the set point. Should I be able to write to the same register that I read the set point from ?
You are correct that the same register is used for both reading and writing the set point. One thing that you should do is only do a single register write.
Also make sure your 'scan' rate is not too fast. You should only read the registers every 2 seconds or longer. Most messages will generate a reply in 500mz or less. This in not guaranteed.
Also, be aware that the values written via the Modbus interface are always in English units (F) regardless of the instrument display mode. The High and Low alarm values are deviations. So, they are typically set to 5 or so.
For more information on Modbus and Advantage, see FYI 277 : Modbus RTU and Modbus TCP/IP Communications and Components
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