Rievtech xLogic ELC Series User Manual page 152

Note: 1. Data register Index: High Low /Low High
For example, when High Low index was set, one data 0x 00 12 was read and saved to AQ, AQ= 0X0012;
however, when Low High index was set, AQ=0x 1200
Regarding Modbus RTU detail, please refer to our Modbus RTU communication protocol file for it.
Description of the function:
In the configuration of our xLogic communication, the xLogic usually serves as a slave via Modbus RTU
Protocol, and can communicate with a master directly. That's to say, any device communicating with
xLogic sends command to it, and then its response will be sent out only when the xLogic has received the
command, Just as the below figure shows:
However, the "Modbus Read" or "Modbus Write"(next chapter will introduce it) function block would be
utilized if xLogic shall be required to play a role of master to communicate with other devices. As the
following figure shows:
When you put the "Modbus read" or "Modbus Write" function block in your program and make some
configurations, the function that xLogic serves as master will be realized.
The Property in dialog box of "Modbus Read" shows as below figure:
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