Turns out the baud rate was wrong and I should have figured that out from the waveform.

I used the automatic baud rate detection feature.

HardwareSerial pump(2);
#define TXD 17
#define RXD 16

char lastByte = 0;
char inByte = 0;
int count = 0;

void setup() {
// initialize both serial ports ...

Thanks for replying! It's appreciated.

I made some changes to the code as suggested, but I'm still just getting "0000" zeros.

HardwareSerial pump(2);
#define TXD 17
#define RXD 16

char lastByte = 0;
char inByte = 0;
int count = 0;

void setup() {
// initialize both serial ports:
Serial.begin ...

Hi,
First time working with the ESP32 and interfacing with RS485.
I'm using this shield with a M3485 chip.
https://www.electrodragon.com/product/esp32-can-rs-485-wire-interface-shield/
For now, I'm just trying to receive data over the RS485 interface and echo it to the serial monitor.


#define ...