public static IMemoryOwner <byte> TranslateToMemory(S7ReadJobDatagram datagram, out int memoryLength) { var result = S7HeaderDatagram.TranslateToMemory(datagram.Header, out memoryLength); var mem = result.Memory.Slice(0, memoryLength); var span = mem.Span; var offset = datagram.Header.GetHeaderSize(); span[offset++] = datagram.Function; span[offset++] = datagram.ItemCount; foreach (var item in datagram.Items) { S7AddressItemSpecificationDatagram.TranslateToMemory(item, mem.Slice(offset)); offset += item.GetSpecificationLength(); } return(result); }
public static S7ReadJobDatagram TranslateFromMemory(Memory <byte> data) { var span = data.Span; var result = new S7ReadJobDatagram { Header = S7HeaderDatagram.TranslateFromMemory(data), }; var offset = result.Header.GetHeaderSize(); result.Function = span[offset++]; result.ItemCount = span[offset++]; for (var i = 0; i < result.ItemCount; i++) { var res = S7AddressItemSpecificationDatagram.TranslateFromMemory(data.Slice(offset)); result.Items.Add(res); offset += res.GetSpecificationLength(); } return(result); }
public static S7ReadJobDatagram BuildRead(SiemensPlcProtocolContext context, int id, IEnumerable <ReadItem> vars) { var result = new S7ReadJobDatagram(); result.Header.ProtocolDataUnitReference = (ushort)id; if (vars != null) { foreach (var item in vars) { result.Items.Add(new S7AddressItemSpecificationDatagram { TransportSize = S7AddressItemSpecificationDatagram.GetTransportSize(item.Area, item.VarType), ItemSpecLength = item.Length, DbNumber = item.DbNumber, Area = (byte)item.Area, Address = S7AddressItemSpecificationDatagram.GetAddress(item.Offset, item.VarType) }); } } result.Header.ParamLength = (ushort)(2 + result.Items.Count * 12); result.ItemCount = (byte)result.Items.Count; return(result); }