2013-11-06 21:47:49 +08:00
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/*
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* FreeModbus Libary: A portable Modbus implementation for Modbus ASCII/RTU.
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* Copyright (c) 2006 Christian Walter <wolti@sil.at>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* File: $Id: mbframe.h,v 1.9 2006/12/07 22:10:34 wolti Exp $
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*/
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#ifndef _MB_FRAME_H
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#define _MB_FRAME_H
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#ifdef __cplusplus
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PR_BEGIN_EXTERN_C
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#endif
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/*!
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* Constants which defines the format of a modbus frame. The example is
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* shown for a Modbus RTU/ASCII frame. Note that the Modbus PDU is not
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* dependent on the underlying transport.
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*
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* <code>
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* <------------------------ MODBUS SERIAL LINE PDU (1) ------------------->
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* <----------- MODBUS PDU (1') ---------------->
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* +-----------+---------------+----------------------------+-------------+
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* | Address | Function Code | Data | CRC/LRC |
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* +-----------+---------------+----------------------------+-------------+
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* | | | |
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* (2) (3/2') (3') (4)
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*
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* (1) ... MB_SER_PDU_SIZE_MAX = 256
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* (2) ... MB_SER_PDU_ADDR_OFF = 0
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* (3) ... MB_SER_PDU_PDU_OFF = 1
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* (4) ... MB_SER_PDU_SIZE_CRC = 2
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*
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* (1') ... MB_PDU_SIZE_MAX = 253
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* (2') ... MB_PDU_FUNC_OFF = 0
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* (3') ... MB_PDU_DATA_OFF = 1
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* </code>
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*/
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/* ----------------------- Defines ------------------------------------------*/
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#define MB_PDU_SIZE_MAX 253 /*!< Maximum size of a PDU. */
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#define MB_PDU_SIZE_MIN 1 /*!< Function Code */
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#define MB_PDU_FUNC_OFF 0 /*!< Offset of function code in PDU. */
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#define MB_PDU_DATA_OFF 1 /*!< Offset for response data in PDU. */
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/* ----------------------- Prototypes 0-------------------------------------*/
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typedef void ( *pvMBFrameStart ) ( void );
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typedef void ( *pvMBFrameStop ) ( void );
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typedef eMBErrorCode( *peMBFrameReceive ) ( UCHAR * pucRcvAddress,
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UCHAR ** pucFrame,
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USHORT * pusLength );
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typedef eMBErrorCode( *peMBFrameSend ) ( UCHAR slaveAddress,
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const UCHAR * pucFrame,
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USHORT usLength );
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typedef void( *pvMBFrameClose ) ( void );
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#ifdef __cplusplus
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PR_END_EXTERN_C
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#endif
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#endif
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