Modbus slave/master 프로그램

<div class="entry"><h1>Modbus slave code</h1><code> #include <SimpleModbusSlave.h></code>#define RXPin 0                 // USB 시리얼일 경우 주석 처리할 것 #define TXPin 1                 // USB 시리얼일 경우 주석 처리할 것 #define PTTPin 2               // USB 시리얼일 경우 주석 처리할 것enum {PARAM1, PARAM2, PARAM3,                         // add params as you want, here! ( 3개만 전송하는 경우의 예) // leave this one TOTAL_REGS_SIZE // total number of registers for function 3 and 16 share the same register array};unsigned int registers[TOTAL_REGS_SIZE];void setup() {// Modbus init modbus_configure(9600, 1, 2, TOTAL_REGS_SIZE,0);}void loop() {modbus_update(registers);} <h1>Modbus master code</h1><code> #include <SimpleModbusMaster.h></code>#define baud 9600 #define timeout 1000 #define polling 250 #define retry_count 10 #define TxEnablePin 8 // Pay attention! Use 3 if you want…enum {READ_P, // leave this one TOTAL_NO_OF_PACKETS // total number of registers for function 3 and 16 share the same register array};enum {PARAM1, PARAM2, PARAM3, // add params as you want, here! // leave this one TOTAL_REGS_SIZE // total number of registers for function 3 and 16 share the same register array};Packet packets[TOTAL_NO_OF_PACKETS]; packetPointer readPacket = &packets[READ_P];unsigned int slavedata[TOTAL_REGS_SIZE];void setup() {// read 3 registers starting at address 0 readPacket->id = 2; readPacket->function = READ_HOLDING_REGISTERS; readPacket->address = 0; readPacket->no_of_registers = TOTAL_REGS_SIZE; readPacket->register_array = slavedata;modbus_configure(baud, timeout, polling, retry_count, TxEnablePin, packets, TOTAL_NO_OF_PACKETS);}void loop() {unsigned int connection_status = modbus_update(packets);if (connection_status != TOTAL_NO_OF_PACKETS) {// You could re-enable the connection by: packets[connection_status].connection = true;}} </div>