--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mb_rtu_private.h Sun Mar 05 00:05:46 2017 +0000
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2001,2016 Mario de Sousa (msousa@fe.up.pt)
+ *
+ * This file is part of the Modbus library for Beremiz and matiec.
+ *
+ * This Modbus library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this Modbus library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * This code is made available on the understanding that it will not be
+ * used in safety-critical situations without a full and competent review.
+ */
+
+
+
+#ifndef MODBUS_RTU_PRIVATE_H
+#define MODBUS_RTU_PRIVATE_H
+
+#include "mb_types.h" /* get the data types */
+#include "mb_util.h"
+
+
+/* serial port default configuration... */
+#define DEF_DATA_BITS 8
+#define DEF_STOP_BITS_PAR 1 /* default stop bits if parity is used */
+#define DEF_STOP_BITS_NOP 2 /* default stop bits if parity is not used */
+#define DEF_BAUD_RATE 9600
+
+
+/* Send retries of rtu frames... */
+#define RTU_FRAME_SEND_RETRY 1
+ /* NOTES:
+ * - the above are the retries at the layer1 level,
+ * higher layers may decide to retry for themselves!
+ */
+
+
+/* Buffer sizes... */
+ /* We use double the maximum frame length for the read buffer,
+ * due to the algorithm used to work around aborted frames.
+ */
+#define RECV_BUFFER_SIZE_SMALL (MAX_RTU_FRAME_LENGTH + 10)
+#define RECV_BUFFER_SIZE_LARGE (2 * MAX_RTU_FRAME_LENGTH)
+
+
+/* Frame lengths... */
+
+ /* The number of bytes in each frame format, excluding CRC.
+ *
+ * BYTE_COUNT_3 denotes that third byte of frame contains the number of bytes;
+ * - total number of bytes in frame is
+ * BYTE_COUNT_3_HEADER + byte_count
+ * BYTE_COUNT_34 denotes that third+fourth bytes of frame contain the number of bytes;
+ * - total number of bytes in frame is
+ * BYTE_COUNT_34_HEADER + byte_count
+ * BYTE_COUNT_7 denotes that seventh byte of frame contain the number of bytes;
+ * - total number of bytes in frame is
+ * BYTE_COUNT_7_HEADER + byte_count
+ * BYTE_COUNT_11 denotes that eleventh byte of frame contain the number of bytes;
+ * - total number of bytes in frame is
+ * BYTE_COUNT_11_HEADER + byte_count
+ * BYTE_COUNT_U denotes unknown number of bytes;
+ */
+
+#define BYTE_COUNT_3_HEADER 3
+#define BYTE_COUNT_34_HEADER 4
+#define BYTE_COUNT_7_HEADER 7
+#define BYTE_COUNT_11_HEADER 11
+
+#define BYTE_COUNT_3 (-3)
+#define BYTE_COUNT_34 (-34)
+#define BYTE_COUNT_7 (-7)
+#define BYTE_COUNT_11 (-11)
+#define BYTE_COUNT_U (-128)
+
+
+#define MAX_FUNCTION_CODE 0x18
+
+#define MIN_FRAME_LENGTH 3
+#define EXCEPTION_FRAME_LENGTH 3
+
+static i8 query_frame_lengths[MAX_FUNCTION_CODE+1] = {
+ /* 0x00 */ 0, /* unused */
+ /* 0x01 */ 6, /* Read Coil Status */
+ /* 0x02 */ 6, /* Read Input Status */
+ /* 0x03 */ 6, /* Read Holding Registers */
+ /* 0x04 */ 6, /* Read Input Registers */
+ /* 0x05 */ 6, /* Force Single Coil */
+ /* 0x06 */ 6, /* Preset Single Register */
+ /* 0x07 */ 2, /* Read Exception Status */
+ /* 0x08 */ 4, /* Diagnostics */
+ /* 0x09 */ BYTE_COUNT_U, /* Program 484 */
+ /* 0x0A */ BYTE_COUNT_U, /* Poll 484 */
+ /* 0x0B */ 2, /* Fetch Comm. Event Counter */
+ /* 0x0C */ 2, /* Fetch Comm. Event Log */
+ /* 0x0D */ BYTE_COUNT_U, /* Program Controller */
+ /* 0x0E */ BYTE_COUNT_U, /* Poll Controller */
+ /* 0x0F */ BYTE_COUNT_7, /* Force Multiple Coils */
+ /* 0x10 */ BYTE_COUNT_7, /* Preset Multiple Registers */
+ /* 0x11 */ 2, /* Report Slave ID */
+ /* 0x12 */ BYTE_COUNT_U, /* Program 884/M84 */
+ /* 0x13 */ BYTE_COUNT_U, /* Reset. Comm. Link */
+ /* 0x14 */ BYTE_COUNT_3, /* Read General Reference */
+ /* 0x15 */ BYTE_COUNT_3, /* Write General Reference */
+ /* 0x16 */ 8, /* Mask Write 4X Register */
+ /* 0x17 */ BYTE_COUNT_11, /* Read/Write 4x Register */
+ /* 0x18 */ 4 /* Read FIFO Queue */
+ };
+
+static i8 response_frame_lengths[MAX_FUNCTION_CODE+1] = {
+ /* 0x00 */ 0, /* unused */
+ /* 0x01 */ BYTE_COUNT_3, /* Read Coil Status */
+ /* 0x02 */ BYTE_COUNT_3, /* Read Input Status */
+ /* 0x03 */ BYTE_COUNT_3, /* Read Holding Registers */
+ /* 0x04 */ BYTE_COUNT_3, /* Read Input Registers */
+ /* 0x05 */ 6, /* Force Single Coil */
+ /* 0x06 */ 6, /* Preset Single Register */
+ /* 0x07 */ 3, /* Read Exception Status */
+ /* 0x08 */ 6,/*see (1)*/ /* Diagnostics */
+ /* 0x09 */ BYTE_COUNT_U, /* Program 484 */
+ /* 0x0A */ BYTE_COUNT_U, /* Poll 484 */
+ /* 0x0B */ 6, /* Fetch Comm. Event Counter */
+ /* 0x0C */ BYTE_COUNT_3, /* Fetch Comm. Event Log */
+ /* 0x0D */ BYTE_COUNT_U, /* Program Controller */
+ /* 0x0E */ BYTE_COUNT_U, /* Poll Controller */
+ /* 0x0F */ 6, /* Force Multiple Coils */
+ /* 0x10 */ 6, /* Preset Multiple Registers */
+ /* 0x11 */ BYTE_COUNT_3, /* Report Slave ID */
+ /* 0x12 */ BYTE_COUNT_U, /* Program 884/M84 */
+ /* 0x13 */ BYTE_COUNT_U, /* Reset. Comm. Link */
+ /* 0x14 */ BYTE_COUNT_3, /* Read General Reference */
+ /* 0x15 */ BYTE_COUNT_3, /* Write General Reference */
+ /* 0x16 */ 8, /* Mask Write 4X Register */
+ /* 0x17 */ BYTE_COUNT_3, /* Read/Write 4x Register */
+ /* 0x18 */ BYTE_COUNT_34 /* Read FIFO Queue */
+ };
+
+/* NOTE (1):
+ * The diagnostic function (0x08) has sub-functions. In particular,
+ * sub-function 21 (0x15) has two sub-sub-functions. In the very
+ * particular case of *one* of these sub-sub-functions, the reply
+ * frame does *not* have a size of 4, but is variable in length
+ * and includes a byte counter.
+ * To take this into account in the table would require an extra two
+ * tables.
+ * The above length has been hardcoded into the frame_length() function
+ * (in file modbus_rtu.c)
+ */
+
+
+#define FALSE 0
+#define TRUE 1
+
+
+#endif /* MODBUS_RTU_PRIVATE_H */
+
+
+
+
+
+
+
+