USR IOT USR-N510, User Manual

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User Manual
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Fig. 141
Polling slave device configuration
In the slave property, enter the device name, bind to the Port1, enter the slave address and polling interval, enable merge collection
function, the description of the configuration parameters on this interface is shown in
table 18
. We use the temperature and
humidity sensor1 as an example to describe the process. After finishing configuring the slave device, please scroll down to the bottom
of the page and click on "Save" button to save all the changes that you have made. All configurations take effect after a system
reboot.
9.2. Add modbus data points
9.2.1. Register type and offset
Table 25 Typical Register Tables
Register type Address range Description
Coil points 00001 – 09999 Read, function code 0x1, bool values
Discrete inputs 10001 – 19999 Read only, function code 0x2, bool values
Input registers 30001 – 39999 Read only, function code 0x4, int,uint,float values
Holding registers 40001 – 49999 Read/Write, function code 0x3,int,uint,float values
The Modbus register addressing starts with register 0, but some device manufacturers start with the number 1 in the device
documentation. In this case, the number minus 1 should give the correct register address. Offsets can be represented in different
ways. Sometimes as Hex values and sometime the offset will also contain the register type. For example Offsets in the Holding
Register range might start with a 4 such as 411001, in the SCADA this would be entered as 11001.