ModbusMaster.rar - ModbusMaster.h - Arduino library for communicating with Modbus slaves
over RS232/485 (via RTU protocol).
This file is part of ModbusMaster.
ModbusMaster is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ModbusMaster 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with ModbusMaster. If not, see <http://www.gnu.org/licenses/>.
Written by Doc Walker (Rx)
Copyright © 2009, 2010 Doc Walker <dfwmountaineers at gmail dot com>
$Id: ModbusMaster.h 39 2010-02-10 02:12:21Z dfwmountaineers $
,2010-08-02 16:42:34,下载61次
upload.rar - Hello everybody,
I d like to share some of my routines which are based upon Neutone s ideas.
We use this code in our welding machines successfully for more than 2 years now.
The protocol is built like this: Firstly the MASTER scans the bus to find out what SLAVE(S) is/are present in the system. Its behaviour (commands issued to particular SLAVES) depends on the results of this scanning process. The main loops in all members must be designed so that they take 1 msec because all bus timings (end of frame recognition) rely on that. The advantage is that no other timers are needed for the communication.
The code will run on PIC16F877@20MHz or PIC18F452 and it s been compiled with PCM or PCH 3.190
Well, let s start with MASTER main part
,2010-07-21 18:34:22,下载2次