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87 lines
3.6 KiB
87 lines
3.6 KiB
/* |
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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 ) ( uint8_t * pucRcvAddress, |
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uint8_t ** pucFrame, |
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uint16_t * pusLength ); |
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typedef eMBErrorCode( *peMBFrameSend ) ( uint8_t slaveAddress, |
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const uint8_t * pucFrame, |
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uint16_t 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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