mirror of
https://github.com/ClassicDIY/ModbusTool.git
synced 2026-10-19 14:22:17 +08:00
ThomasvLingen
e847404843
The response should echo back the written value. This was drawn from the decoded command, which used `0xFFFF` for truthy representation instead of the `0xFF00` that the Modbus standard specifies. The decoder now no longer makes such a conversion and just copies the written value instead.
85 lines
2.1 KiB
C#
85 lines
2.1 KiB
C#
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/*
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* Copyright 2012 Mario Vernari (http://cetdevelop.codeplex.com/)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* 09/Apr/2012
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* Class name changed due improved abstraction (RTU support)
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**/
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namespace ModbusLib.Protocols
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{
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/// <summary>
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/// Modbus codec for commands: writing single discrete datum
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/// </summary>
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public class ModbusCodecWriteSingleDiscrete
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: ModbusCommandCodec
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{
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#region Client codec
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public override void ClientEncode(
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ModbusCommand command,
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ByteArrayWriter body)
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{
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body.WriteUInt16BE((ushort)command.Offset);
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var value = command.Data[0] != 0
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? 0xFF00
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: 0;
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body.WriteInt16BE((short)value);
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}
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public override void ClientDecode(
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ModbusCommand command,
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ByteArrayReader body)
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{
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//not used
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}
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#endregion
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#region Server codec
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public override void ServerEncode(
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ModbusCommand command,
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ByteArrayWriter body)
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{
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ModbusCodecBase.PushRequestHeader(
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command,
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body);
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}
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public override void ServerDecode(
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ModbusCommand command,
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ByteArrayReader body)
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{
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command.Offset = body.ReadUInt16BE();
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command.Count = 1;
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command.QueryTotalLength += 2;
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command.Data = new ushort[1];
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command.Data[0] = body.ReadUInt16BE();
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}
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#endregion
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}
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}
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