Corrupted data from RS485 Sensor Node
-
Hello. I'm using Arduino Pro Mini (atmega328) and checking one of basic examples (MotionSensorRS485). The gateway is connected via same RS485 converter. Unfortunately they do not communicate.
First I checked connection (direct TX-RX/RX-TX) connection - with failure. Then I took another USB/TTL converter to check what is on the output of softserial - and I found some kind of garbage data. It looks like wrong baudrate so I checked all "standard" speeds from 2400 up to 115200. (Configured to 9600).
Then I enabled DEBUG, enabled HWSERIAL and set to Serial. Both baudrates set to 9600. So I have now both, the communication frame and debug. See screenshot below.
When I disable DEBUG, only corrupted frame left:
The code:
//#define MY_DEBUG //#define MY_DEBUG_LOCAL // Enable RS485 transport layer #define MY_RS485 // Define this to enables DE-pin management on defined pin #define MY_RS485_DE_PIN 2 // Set RS485 baud rate to use #define MY_BAUD_RATE 9600 #define MY_RS485_BAUD_RATE 9600 //19200 //57600 //38400 //9600 #define MY_RS485_SOH_COUNT 1 #define MY_RS485_HWSERIAL Serial #define MY_SPLASH_SCREEN_DISABLED //#define MY_PASSIVE_NODE #define MY_NODE_ID 10 #include <MySensors.h> uint32_t SLEEP_TIME = 3000;//+120000 // Sleep time between reports (in milliseconds) #define DIGITAL_INPUT_SENSOR 3 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define CHILD_ID 1 // Id of the sensor child // Initialize motion message MyMessage msg(CHILD_ID, V_TRIPPED); void setup() { pinMode(DIGITAL_INPUT_SENSOR, INPUT); // sets the motion sensor digital pin as input } void presentation() { // Send the sketch version information to the gateway and Controller sendSketchInfo("Motion Sensor", "1.0"); // Register all sensors to gw (they will be created as child devices) present(CHILD_ID, S_MOTION); } void loop() { // Read digital motion value bool tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH; Serial.println(tripped); send(msg.set(tripped?"1":"0")); // Send tripped value to gw // Sleep until interrupt comes in on motion sensor. Send update every two minute. //sleep(digitalPinToInterrupt(DIGITAL_INPUT_SENSOR), CHANGE, SLEEP_TIME); }An Idea? Arduino board is not corrupted, any short sketch with SoftSerial library works fine. Haven't checked MySensors with SoftSerial though. MySensors version 2.3.2. Checked on Arduino IDE and VSC.
Cheers! -
Hi Cabat. Both checked. I wrote my own code to test it. I'm having my own working RS485 network at home already. I did it by myself and I'm pretty experienced in debugging ;). I want to switch to MySensors now due to more flexibility.
So to summarize:- it is not a RS485 issue, tested,
- it is not a USB/TTL converter issue, tested,
- it is not an UART bitrate issue, not on the PC side at least,
- there is no difference if I use hardware or software serial - same content.
I have conserns about the Library. According to this page:
https://www.mysensors.org/download/serial_api_20
the typical frame sent by a node should be like this:
12;6;0;0;3;My Light\n
12;6;1;0;0;36.5\n
13;7;1;0;2;1\nAs you can see on picture in firs post, when I configured to use HWSerial for RS485 and DEBUG set ON, I shall expect both - Communication and Debug on the same line. Debug data is correct, but the frame is nothing like a text message - looks like the content is sent in HEX not ASCII.
I learned there is no encryption, so it is not an encrypted data I assume. -
RS485 data is different to serial api. Serial api is only from gateway to controller.
Please check links in 1st post.
https://forum.mysensors.org/topic/1947/rs485-rs232-serial-transport-class-for-mysensors-org -
Yes, I realized that last Sunday. I went through the code of library. I had to switch to another project for a week or so, then I come back to it. Thanks!
