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ModbusMasterProtocolV4 very slow

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Hi, I got the library from here: https://code.google.com/p/processing-modbus/ I have created 10 packets to receive and send data in 49 holding registers (each packet holds 10 registers, last 2 - only 9 registers). The construction seems to be fine, except that time value used for polling is not actualy the same that the application is polling my Arduino. When I set polling time for 500 ms, I get values update every 6 - 8 s, when polling time is 4000 ms, values update after 10-12 s. Additionally, when connection is established whole rendering of graphics in the application works with a lag. If any more details are needed, I can provide them. What can be wrong in here?


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