7 hours ago
Hi Kincony,
I have bought some of your B4M modules, and try to use the RS485 port.
I try to run the code here: https://www.kincony.com/forum/showthread.php?tid=8934
but cannot receive the data from RS485 port. The log shows that port is not available.
Can you help me troubleshoot this issue?
Best regards,
Hai Pham
I have bought some of your B4M modules, and try to use the RS485 port.
I try to run the code here: https://www.kincony.com/forum/showthread.php?tid=8934
Code:
/*
* Made by KinCony IoT: https://www.kincony.com
*
* RS485 Communication Test
*
* This program is a simple test for RS485 communication using ESP32-S3.
* It will send a message over RS485 and then read incoming messages.
* The TXD pin is defined as GPIO 18 and RXD pin is defined as GPIO 8.
*/
#include <HardwareSerial.h>
// Define RS485 pins
#define RS485_RXD 39
#define RS485_TXD 38
// Create a hardware serial object
HardwareSerial rs485Serial(1);
void setup() {
// Start serial communication for debugging
Serial.begin(115200);
while (!Serial);
// Initialize RS485 Serial communication
rs485Serial.begin(9600, SERIAL_8N1, RS485_RXD, RS485_TXD);
}
void loop() {
// Send a test message
rs485Serial.println("Hello from KinCony B8M!");
// Wait for a short period
delay(1000);
// Check if data is available to read
if (rs485Serial.available()) {
String receivedMessage = "";
while (rs485Serial.available()) {
char c = rs485Serial.read();
receivedMessage += c;
}
// Print the received message
Serial.print("Received: ");
Serial.println(receivedMessage);
} else
{
Serial.println("RS485 is not available");
}
// Wait before sending the next message
delay(2000);
}but cannot receive the data from RS485 port. The log shows that port is not available.
Can you help me troubleshoot this issue?
Best regards,
Hai Pham
