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--- en:mervis-ide:30-communication-protocols:30-modbus:modpoll [2024/05/08 10:42]
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-====== Mervis and Modpoll tool ======
-[[https://www.modbusdriver.com/modpoll.html|Modpoll]] is a very nice testing tool but one needs to understand quite deeply the inner workings of Modbus protocol to use it properly.
-Here are some basic examples that demonstrate how to poll Mervis RT Modbus Server.
-===== Reading Reals/Floats =====
-<code>.\modpoll.exe -a 1 -r 1 -c 4 -t 4:float -f  -1 -o 5 -p 502 192.168.1.120</code>
-  * //-a// Modbus server address: 1
-  * //-r// register NUMBER 1 (PDU address = 0) - the same number you see in Modbus server definition in IDE
-  * //-c// read 4 elements
-  * //-t// interpret the values as floats
-  * //-f// - Mervis uses Big-Endian
-  * //-1// poll the server just once
-  * //-o// timeout 5s
-  * //-p// read from the IP: 192.168.1.120 port 502