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99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
/*
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RS485_HalfDuplex.pde - example using ModbusMaster library to communicate
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with EPSolar LS2024B controller using a half-duplex RS485 transceiver.
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This example is tested against an EPSolar LS2024B solar charge controller.
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See here for protocol specs:
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http://www.solar-elektro.cz/data/dokumenty/1733_modbus_protocol.pdf
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Library:: ModbusMaster
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Author:: Marius Kintel <marius at kintel dot net>
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Copyright:: 2009-2016 Doc Walker
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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#include <ModbusMaster.h>
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/*!
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We're using a MAX485-compatible RS485 Transceiver.
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Rx/Tx is hooked up to the hardware serial port at 'Serial'.
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The Data Enable and Receiver Enable pins are hooked up as follows:
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*/
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#define MAX485_DE 3
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#define MAX485_RE_NEG 2
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// instantiate ModbusMaster object
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ModbusMaster node;
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void preTransmission()
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{
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digitalWrite(MAX485_RE_NEG, 1);
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digitalWrite(MAX485_DE, 1);
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}
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void postTransmission()
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{
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digitalWrite(MAX485_RE_NEG, 0);
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digitalWrite(MAX485_DE, 0);
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}
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void setup()
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{
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pinMode(MAX485_RE_NEG, OUTPUT);
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pinMode(MAX485_DE, OUTPUT);
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// Init in receive mode
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digitalWrite(MAX485_RE_NEG, 0);
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digitalWrite(MAX485_DE, 0);
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// Modbus communication runs at 115200 baud
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Serial.begin(115200);
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// Modbus slave ID 1
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node.begin(1, Serial);
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// Callbacks allow us to configure the RS485 transceiver correctly
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node.preTransmission(preTransmission);
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node.postTransmission(postTransmission);
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}
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bool state = true;
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void loop()
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{
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uint8_t result;
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uint16_t data[6];
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// Toggle the coil at address 0x0002 (Manual Load Control)
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result = node.writeSingleCoil(0x0002, state);
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state = !state;
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// Read 16 registers starting at 0x3100)
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result = node.readInputRegisters(0x3100, 16);
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if (result == node.ku8MBSuccess)
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{
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Serial.print("Vbatt: ");
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Serial.println(node.getResponseBuffer(0x04)/100.0f);
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Serial.print("Vload: ");
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Serial.println(node.getResponseBuffer(0xC0)/100.0f);
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Serial.print("Pload: ");
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Serial.println((node.getResponseBuffer(0x0D) +
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node.getResponseBuffer(0x0E) << 16)/100.0f);
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}
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delay(1000);
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}
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