\nModbus is a big-endian protocol. The more significant byte of a 16-bit value is sent before the less significant byte\n<\/p>\n
\nSo, for bytes on the bus a UInt16 is sent like this:\n<\/p>\n
\nBits15:8 | Bits7:0\n<\/p>\n
\nUInt16[0] | UInt16[1]\n<\/p>\n
\nUInt16[0] | UInt16[1] | UInt16[2] | UInt16[3]\n<\/p>\n
\nUInt16[0] | UInt16[1]\n<\/p>\n
\r\n\r\n\t\/\/Converting big endian modbus registers to float on little endian windows (ModbusRegisterValues[0] was received first)\r\n\tarray<Byte>^byteArray = gcnew array<Byte>(4);\r\n\tbyteArray[3] = (Byte)(ModbusRegisterValues[0] >> 8);\r\n\tbyteArray[2] = (Byte)(ModbusRegisterValues[0] & 0x00ff);\r\n\tbyteArray[1] = (Byte)(ModbusRegisterValues[1] >> 8);\r\n\tbyteArray[0] = (Byte)(ModbusRegisterValues[1] & 0x00ff);\r\n\tfloat my_float = BitConverter::ToSingle(byteArray, 0);\r\n<\/code><\/pre>\n\r\n\r\n\t\/\/Converting float on little endian windows to big endian modbus registers (ModbusRegisterValues[0] will be sent first)\r\n\tModbusRegisterValues = gcnew array <UInt16>(2);\r\n\tarray<Byte>^byteArray = BitConverter::GetBytes(my_float_value);\r\n\tModbusRegisterValues[0] = ((UInt16)byteArray[3] << 8) | ((UInt16)byteArray[2]);\t\t\/\/Converting float on little endian windows to big endian modbus registers\r\n\tModbusRegisterValues[1] = ((UInt16)byteArray[1] << 8) | ((UInt16)byteArray[0]);\r\n<\/code><\/pre>\n\nchar conversion
\n<\/h5>\n\r\n\r\n\t\/\/RegisterValues[] is UInt16 array read over modbus\r\n\tarray<Byte> ^NameArray = gcnew array<Byte>(10);\r\n\tNameArray[0] = (Byte)(RegisterValues[0] >> 8);\r\n\tNameArray[1] = (Byte)(RegisterValues[0] & 0x00ff);\r\n\tNameArray[2] = (Byte)(RegisterValues[1] >> 8);\r\n\tNameArray[3] = (Byte)(RegisterValues[1] & 0x00ff);\r\n\tNameArray[4] = (Byte)(RegisterValues[2] >> 8);\r\n\tNameArray[5] = (Byte)(RegisterValues[2] & 0x00ff);\r\n\tNameArray[6] = (Byte)(RegisterValues[3] >> 8);\r\n\tNameArray[7] = (Byte)(RegisterValues[3] & 0x00ff);\r\n\tNameArray[8] = (Byte)(RegisterValues[4] >> 8);\r\n\tNameArray[9] = (Byte)(RegisterValues[4] & 0x00ff);\r\n\tsTemp = System::Text::Encoding::UTF8->GetString(NameArray);\r\n\tsTemp = sTemp->Replace("\\0", "");\r\n<\/code><\/pre>\n\n \n<\/p>\n
\n \n<\/p>\n
\n <\/p>\n","protected":false},"excerpt":{"rendered":"
Modbus is a big-endian protocol. The more significant byte of a 16-bit value is sent before the less significant byte So, for bytes on the bus a UInt16 is sent like this: Bits15:8 | Bits7:0 Converting the modbus 16 bit words UInt32 conversion UInt16[0] | UInt16[1] UInt64 conversion UInt16[0] | UInt16[1] | UInt16[2] | UInt16[3] Float conversion UInt16[0] | UInt16[1] \/\/Converting big endian modbus […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[78],"tags":[],"class_list":["post-1945","post","type-post","status-publish","format-standard","hentry","category-modbus"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1945","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/comments?post=1945"}],"version-history":[{"count":5,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1945\/revisions"}],"predecessor-version":[{"id":1951,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1945\/revisions\/1951"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/media?parent=1945"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/categories?post=1945"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/tags?post=1945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}