asukiaaa / arduino-rs485 Goto Github PK

Hi,

i have your example code on a Atmega4808 running and on the other side a linux machine with mbpoll and got some errors. Maybe you could help me to understand your code closer.

#include 

#define PIN_RS485_DE PIN_PF6
#define PIN_RS485_RE PIN_PF6
#define RS485_BAUDRATE 9600
#define RS485_DEVICE_ADDRESS 33
rs485_asukiaaa::ModbusRtu::Central modbus(&Serial, PIN_RS485_DE, PIN_RS485_RE);

void setup() {
  modbus.begin(RS485_BAUDRATE);
}

void loop() {
  uint8_t data[] = { 0, 1, 2 };
  modbus.writeQuery(RS485_DEVICE_ADDRESS, rs485_asukiaaa::ModbusRtu::FnCode::Write, data, 3);
}

ping PF6 -> on hardware picture RS485_DIR

on the linux side i run mbpoll to read the data via an usb-ftdi-rs485 adapter:

mbpoll -a 33 -b 9600 -t 3 -c 3 -r 1 /dev/ttyUSB0 -v
debug enabled
Set mode to RTU for serial port
Set device=/dev/ttyUSB0
mbpoll 1.0-0 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.

Opening /dev/ttyUSB0 at 9600 bauds (E, 8, 1)
Set response timeout to 1 sec, 0 us
Protocol configuration: Modbus RTU
Slave configuration...: address = [33]
start reference = 1, count = 3
Communication.........: /dev/ttyUSB0, 9600-8E1
t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, input register table

-- Polling slave 33... Ctrl-C to stop)
[21][04][00][00][00][03][B7][6B]
Waiting for a confirmation...
<00><00><00><00><00>
ERROR CRC received 0x0 != CRC calculated 0x71C0
Read input register failed: Invalid CRC
-- Polling slave 33... Ctrl-C to stop)
[21][04][00][00][00][03][B7][6B]
Waiting for a confirmation...
<00><00><00><00><00>
ERROR CRC received 0x0 != CRC calculated 0x71C0
Read input register failed: Invalid CRC
-- Polling slave 33... Ctrl-C to stop)
[21][04][00][00][00][03][B7][6B]
Waiting for a confirmation...
<00><00><00><00><00>
ERROR CRC received 0x0 != CRC calculated 0x71C0
Read input register failed: Invalid CRC
-- Polling slave 33... Ctrl-C to stop)
[21][04][00][00][00][03][B7][6B]
Waiting for a confirmation...
<00><00><00><00><00>
ERROR CRC received 0x0 != CRC calculated 0x71C0
Read input register failed: Invalid CRC
-- Polling slave 33... Ctrl-C to stop)
[21][04][00][00][00][03][B7][6B]

I wonder how can i set the register id in the arduino code. Do you maybe have more examples ?

many thanks

cheers