Hello colleagues,
I am hoping someone has some guidance:
I had the code below working via an RS232/485 shield in conjunction with an Arduino AT Mega 2560. I could write dozens of parameters, worked perfectly for proof of concept on a new control system I'm developing.
Of course, for scalability price-wise, I am looking to shift towards using the Mega with the MAX485 TTL (replace the shield with just the module).
Connections:
5V -> 5V
Ground -> Ground
A-> (unchanged)
B-> (unchanged)
DI-> TX
RO->RX
DE+RE -> Arduino pin 4
Original code:
//INCLUDE LIBRARIES
#include <ArduinoModbus.h>
#include <ArduinoRS485.h>
//ESTABLISH DEVICE ADDRESSES
byte VFD_Address = 0x32; //this must match VFD setting
byte Arduino_Address = 0x35; //arbitrary (needed if multiple arduinos are networked)
//ESTABLISH REGISTERS USED BY THE VFD
uint16_t reg8192;
uint16_t reg8448;
uint16_t reg8449;
//GLOBAL VARIABLES
int SwitchState; //int
int VFD_Status = 0; //status of VFD... 0 off, 1 boost, 2 = run, 3 = coast, 4 = brake
int VFD_PrevState = LOW; //previous state of the VFD (OFF/ON)
long PauseTime = 90000; //set amount of time to wait between runs in ms
int StartUpTime = 10000; //set time for startup
int i; //indicator intialization
//int RecoverTime; //max amount of time allowed for reset to continue where program was
//SET FLAGS
int StartFlag = 0; //create a flag enabling the start of the VFD
//SET VISUAL INDICATORS
int RedLight = 22;
int GreenLight = 26;
int YellowLight = 24;
int BlueLight = 28;
int BlueLight2 = 30;
int ledState = LOW; // ledState used to set the LED (arbitrary)
int ParameterReadAddress[27] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1C, 0x1D};
int ParameterReadValue[27];
int ParameterWriteAddress[44] = {0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x60, 0x61, 0x64, 0x69, 0x72, 0x7D};
int ParameterWriteValue[1][44] = {
{ 230, 280, 300, 300, 280, 5, 1, 5, 1200, 900, -1, -1, -1, -1, 2800, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 100, -1, -1, -1, 495, -1, -1, 1, 30, -1, -1, -1, 3, -1, 0}
};
void setup() {
//ESTABLISH PINS
pinMode(RedLight, OUTPUT); //establish pin 22 as output for light
pinMode(GreenLight, OUTPUT); //establish pin 26 as output for light
pinMode(YellowLight, OUTPUT); //establish pin 24 as output for light
pinMode(BlueLight, OUTPUT); //establish pin 28 as output for light
//START SERIAL COMMUNICATIONS
Serial.begin(9600);
Serial1.begin(9600);
ModbusRTUClient.begin(9600); //start arduino modbus client (client = master)
}
void loop() {
for (i = 0; i < 44; i++) {
if (ParameterWriteValue[1][i] >= 0) {
ModbusRTUClient.holdingRegisterWrite(VFD_Address, ParameterWriteAddress[i], ParameterWriteValue[TubeType][i]);
}
}
} //END LOOP
New code incorporated the following into global variables & setup (respectively):
int EnablePin = 4; //enable pin for max 485
pinMode(EnablePin, OUTPUT);
digitalWrite(EnablePin, HIGH);
Yet this does not work anymore. What am I doing wrong?
