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Stride Gateway Write Variables (Must match the number of bits - Modbus)

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  • Stride Gateway Write Variables (Must match the number of bits - Modbus)

    I am currently using a Stride Gateway (SGW-MQ1611-WF) to a Solo Process Temperature Controller (SL4896-RRE). I have been able to communicate well and send information to the MQTT broker. (Mosquitto and MQHive) I have also been able to use clients (MQTTLens, MQTTBox, etc) to read and write.
    It is the writing back to the temperature controller that is my issue. If the data on MQTT is less then 4 digits in length, the value of the SV on the Solo will go to zero.
    Is there a method in the Stride Gateway to ensure that the data used to write variables on Modbus conform to the 16bit integer and write the 4 digits?
    Example: Data = 700 will result in putting 0 as the set value in the Solo. Data = 0700 will result in putting 70.0 as the set value in the Solo. The Client must write the four digits.
    I would like to see the Stride Gateway enforce the same number of bits required as selected. Is this possible?

    Sometimes when connecting to the MQTT networks they do not have the capability of ensuring 4 digits are sent.

    It would also be good to have the USB ports used for data logging and a simple FTP setup to get the information back to the network.

    Thank you,
    ACC Automation
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  • #2
    If the MQTT client publishes the data in JSON format with a name/value pair the MB write will be handled correctly.

    e.g. {“value”:”700”} or {“value”:”0700”} or {"value": 700} will work correctly.

    Note: {"value":0700} will not work because a leading zero in this case does not follow JSON number syntax.
    Last edited by ewitcher; 02-05-2020, 10:29 AM.