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Practical Industrial Data Networks:Design, Installation and ...

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Modbus overview 107Request FrameAddressFunctionCode01 0FAddressHi Lo00 01ByteCount<strong>Data</strong> CoilStatusCRCHi Lo0F FF 03 .. ..Response FrameAddress01FunctionCode0FAddressNumberof CoilsCRCHi Lo Hi Lo00 01 00 0A .. ..Figure 7.9Example of forcing multiple coils7.3.10 Force multiple registers (function code 10)This is similar to the preset of a single register <strong>and</strong> the forcing of multiple coils. In theexample below, a slave address 01 has 2 registers changed commencing at address 10.Request FrameAddressFunctionCode01 10AddressQuantityByteCountFirstRegisterSecondRegisterCRCHi Lo Hi Lo Hi Lo Hi Lo00 0A 00 02 04 00 0A 01 02 .. ..Response FrameAddress01FunctionCode10AddressQualityCRCHi Lo Hi Lo00 0A 00 02 .. ..Figure 7.10Example of presetting multiple registers

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