Pada kesempatan kali ini saya akan menjelaskan mengenai bagaimana cara membuat sebuah alat nurse call dengan komunikasi 2 master dan 1 slave dengan menggunakan RS485 Arduino. alat ini menggunakan interface VB 6.0 dengan tampilan berupa ruang 1 dan 2 yang mana terdapat 2 perintah yaitu warna merah dan biru. untuk lebih jelasnya berikut adalah koding dan skemanya.
#include <ModbusRtu.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3);
#define slaveID 11
int tombol1 = 10;
int tombol2 = 11;
int tombol1x;
int tombol2x;
uint16_t nilainya = 0;
unsigned long lastPrint = 0;
// data array for modbus network sharing
uint16_t au16data[4] = {
slaveID, 225, 8888, 9999
};
Modbus slave(slaveID, mySerial, 4); // this is slave @1 and RS-232 or USB-FTDI
void setup() {
Serial.begin(9600);
mySerial.begin( 19200 ); // baud-rate at 19200
slave.start();
delay(10);
pinMode(tombol1,INPUT_PULLUP);
pinMode(tombol2,INPUT_PULLUP);
}
void loop() {
slave.poll( au16data, 4 );
if (millis() - lastPrint > 200) {
Serial.print(au16data[0]); Serial.print(":");
Serial.print(au16data[1]); Serial.print(":");
Serial.print(au16data[2]); Serial.println();
lastPrint = millis();
}
readSensor(); //for ultrasonic sensor
}
void readSensor() {
tombol1x = digitalRead(tombol1);
tombol2x = digitalRead(tombol2);
if((tombol1x == 1)&&(tombol2x == 1)){
nilainya = 0;
}
if(tombol1x == 0){
nilainya = 1;
}
if(tombol2x == 0){
nilainya = 2;
}
au16data[1] = nilainya; //data to be sent to slave device
}
#include <ModbusRtu.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3);
#define slaveID 12
int tombol1 = 10;
int tombol2 = 11;
int tombol1x;
int tombol2x;
uint16_t nilainya = 0;
unsigned long lastPrint = 0;
// data array for modbus network sharing
uint16_t au16data[4] = {
slaveID, 225, 8888, 9999
};
Modbus slave(slaveID, mySerial, 4); // this is slave @1 and RS-232 or USB-FTDI
void setup() {
Serial.begin(9600);
mySerial.begin(19200); // baud-rate at 19200
slave.start();
delay(10);
pinMode(tombol1,INPUT_PULLUP);
pinMode(tombol2,INPUT_PULLUP);
}
void loop() {
slave.poll( au16data, 4 );
if (millis() - lastPrint > 200) {
Serial.print(au16data[0]); Serial.print(":");
Serial.print(au16data[1]); Serial.print(":");
Serial.print(au16data[2]); Serial.println();
lastPrint = millis();
}
readSensor(); //for ultrasonic sensor
}
void readSensor() {
tombol1x = digitalRead(tombol1);
tombol2x = digitalRead(tombol2);
if((tombol1x == 1)&&(tombol2x == 1)){
nilainya = 3;
}
if(tombol1x == 0){
nilainya = 4;
}
if(tombol2x == 0){
nilainya = 5;
}
au16data[1] = nilainya; //data to be sent to slave device
}
// modbus RS485 read and write register
// V1.1
// 1 master 2 slave,
// 1 slave : 1 input 1 output
#include <Wire.h>
#include <ModbusRtu.h>
#define slaveNumber 5
#define delayCom 15
#define maxQuery 2*2//slaveNumer*2
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11);
int ruang1;
int ruang2;
uint8_t u8state; //!< machine state
uint8_t u8query; //!< pointer to message query
uint16_t dataBus[slaveNumber*3];
uint16_t lastPrint=100;
int slaveID[slaveNumber] = {11,12,13,14,15}; //id = 0,1,2,3,4
/**
* Modbus object declaration
* u8id : node id = 0 for master, = 1..247 for slave
* port : Serial1 port
* u8txenpin : 0 for RS-232 and USB-FTDI
* or any pin number > 1 for RS-485
*/
Modbus master(0,mySerial,4); // ID, seriapNumber, enablePin
/**
* This is an structe which contains a query to an slave device
*/
modbus_t telegram[slaveNumber*2];
unsigned long u32wait;
void init_modBus(){
int num=0;
int addr=0;
////SLAVE 1
// Read 1 data from Slave 11
telegram[num].u8id = slaveID[0]; // slave address
telegram[num].u8fct = 3; // function code (this one is registers read)
telegram[num].u16RegAdd = 0; // start address in slave
telegram[num].u16CoilsNo = 2; // number of elements (coils or registers) to read
telegram[num].au16reg = dataBus; // pointer to a memory array in the Arduino
num+=1;
addr+=2;
// Write 1 data to Slave 11
telegram[num].u8id = slaveID[0]; // slave address
telegram[num].u8fct = 6; // function code (this one is write a multiple register)
telegram[num].u16RegAdd = 2; // start address in slave
telegram[num].u16CoilsNo = 1; // number of elements (coils or registers) to write
telegram[num].au16reg = dataBus+2; // pointer to a memory array in the Arduino
num+=1;
addr+=1;
////SLAVE 2
// Read 1 data from Slave 12
telegram[num].u8id = slaveID[1]; // slave address
telegram[num].u8fct = 3; // function code (this one is registers read)
telegram[num].u16RegAdd = 0; // start address in slave
telegram[num].u16CoilsNo = 2; // number of elements (coils or registers) to read
telegram[num].au16reg = dataBus; // pointer to a memory array in the Arduino
num+=1;
addr+=2;
// Write 1 data to Slave 12
telegram[num].u8id = slaveID[1]; // slave address
telegram[num].u8fct = 6; // function code (this one is write a multiple register)
telegram[num].u16RegAdd = 2; // start address in slave
telegram[num].u16CoilsNo = 1; // number of elements (coils or registers) to write
telegram[num].au16reg = dataBus+2; // pointer to a memory array in the Arduino
num+=1;
addr+=1;
master.start();
master.setTimeOut( 100 ); // if there is no answer in 100 ms, roll over
u32wait = millis() + 40;
u8state = u8query = 0;
}
void rtuState(){
switch( u8state ) {
case 0:
if (millis() >= u32wait) u8state++; // wait state
break;
case 1:
master.query( telegram[u8query] ); // send query (only once)
u8state++;
u8query++;
if (u8query >= maxQuery)
u8query = 0;
break;
case 2:
master.poll(); // check incoming messages if communication in idle state
if (master.getState() == COM_IDLE) {
u8state = 0;
u32wait = millis() + delayCom; //delay for next state
}
break;
}
}
void printData(){
if (millis() - lastPrint>200){
//print data to validate
//Serial.print(dataBus[0]); Serial.print(":");
//Serial.print(dataBus[1]); Serial.print(":");
//Serial.print(dataBus[2]); Serial.print("\t:\t");
//Serial.println();
}
}
void processData(){
//data to be sent so slave 1 based on slave 2 data
dataBus[2] = dataBus[4]*0.25; //convert 1023 to 255
//data to be sent so slave 2 based on slave 1 data
//dataBus[5] = dataBus[1]*0.25;
if((dataBus[0] == 11)&&(dataBus[1] == 0)){
ruang1 = 0;
Serial.println(ruang1);
}
if((dataBus[0] == 11)&&(dataBus[1] == 1)){
ruang1 = 1;
Serial.println(ruang1);
}
if((dataBus[0] == 11)&&(dataBus[1] == 2)){
ruang1 = 2;
Serial.println(ruang1);
}
if((dataBus[0] == 12)&&(dataBus[1] == 3)){
ruang2 = 3;
Serial.println(ruang2);
}
if((dataBus[0] == 12)&&(dataBus[1] == 4)){
ruang2 = 4;
Serial.println(ruang2);
}
if((dataBus[0] == 12)&&(dataBus[1] == 5)){
ruang2 = 5;
Serial.println(ruang2);
}
}
void setup() {
Serial.begin (9600); //baud rate of Serial PC
mySerial.begin( 19200 ); // baud-rate of RS485
init_modBus();
}
void loop() {
rtuState();
printData();
processData();
}
6. Program Interface VB 6.0
Option Explicit
Dim arrdata()
Dim TotalBaca As Integer
Dim BMI As Single
Dim Keterangan As String
Const MAKSBACA = 10
Dim sHari As String
Dim aHari
Private Sub berhenti_Click()
start.Enabled = True
berhenti.Enabled = False
TimerBaca.Enabled = False
End Sub
Private Sub Command2_Click()
Unload Me
End Sub
Private Sub Command3_Click()
Text1.Text = " "
Label1.Caption = " "
End Sub
Private Sub Form_Load()
Dim i As Byte
For i = 1 To 16
ComboCOM.AddItem (i)
Next i
aHari = Array("Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu")
End Sub
Private Sub start_Click()
Dim u As Integer
On Error GoTo ada_eror
MSComm2.CommPort = ComboCOM.Text
MSComm2.Settings = "9600,N,8,1"
MSComm2.RThreshold = 15
MSComm2.InputLen = 15
MSComm2.InputMode = comInputModeText
MSComm2.PortOpen = True ' buka port
ReDim arrdata(1 To MAKSBACA + 1)
For u = 1 To MAKSBACA
arrdata(u) = 0
Next
TotalBaca = 0
start.Enabled = False
berhenti.Enabled = True
TimerBaca.Enabled = True
ada_eror:
If ComboCOM.ListIndex < 1 Then
MsgBox "COM berada di Nomor : " & Err.Number & vbCrLf & Err.Description, vbCritical + vbOKOnly, "ERROR"
start.Enabled = True
berhenti.Enabled = True
ComboCOM.Text = "Pilih COM"
End If
End Sub
Private Sub Timer1_Timer()
sHari = aHari(Abs(Weekday(Date) - 1))
lbltanggal.Caption = "" & sHari & "," & Format(Date, "dd mmmm yyyy")
lbljam.Caption = Format(Time, "hh:mm:ss")
End Sub
Private Sub TimerBaca_Timer()
Dim strInput As String
Dim strPotong As String
Dim singleInput As Single
Dim u As Integer
strInput = MSComm2.Input
strPotong = strInput
Text1.Text = Text1.Text + strPotong + vbCrLf
singleInput = Val(strPotong)
Label5.Caption = singleInput
If TotalBaca >= MAKSBACA Then
TimerBaca.Enabled = False
If MSComm2.PortOpen = True Then MSComm2.PortOpen = False
Call berhenti_Click
End If
If Label5.Caption = "0" Then
Shape1.Visible = False
Shape2.Visible = False
End If
If Label5.Caption = "11111" Then
Shape1.Visible = True
Shape2.Visible = False
End If
If Label5.Caption = "22222" Then
Shape1.Visible = False
Shape2.Visible = True
End If
If Label5.Caption = "33333" Then
Shape3.Visible = True
Shape4.Visible = True
End If
If Label5.Caption = "44444" Then
Shape3.Visible = True
Shape4.Visible = False
End If
If Label5.Caption = "55555" Then
Shape3.Visible = False
Shape4.Visible = True
End If
End Sub
