User Manual
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Fig. 141 Json template setting
There are three type data point, user define, system,and register value in a Json template.
System data points
The system data points defined by USR-M100 gateway is shown in table 24.
Table 24 System data points
Modbus register value data points
The node name configured in the section 9.2.3 is register value data points.
User define
In addition to the above two types of data points, users can also define your own data points. Such as "user_define": "living room".
9.4.4. Test
We now use modbus slave software to simulate two modbus slave device. The connection and and parameters settings are show in
Fig.142. USB to RS485 converters are connecting PC with serial UART1 of USR-M100 gateway. We use MQTT.fx to connect to the
same broker and subscribe the report topic of USR-M100, we can see the message transmitted at the specified interval.
Fig. 142 Serial port parameters