I am using a Teensy 3.1 micro controller (think arduino on steroids, has a built in CAN controller), and I have a max3232 serial to UART bridge. However I cannot seem to read any messages coming from the LC2 on the Teensy, through the max3232. Does anyone know if it follows normal RS232 protocol? I can read LC2 messages on my laptop in realterm, and I can send messages at the same baud rate to my teensy from realterm. But I can't read messages on the teensy from the LC2.
In summary, this works:
realterm (set to 19200,8n1) --> usb/rs232 adapter -> max3232 -> teensy --> serial monitor
and this works:
serial monitor --> teensy --> max3232 --> usb/rs232 adapter --> realterm (set to 19200, 8n1)
and this works:
wideband lc2 --> usb/rs232 adapter -> realterm (set to 19200, 8n1)
but this doesn't:
wideband lc2 --> max3232 --> teensy --> serial monitor
I'm not getting any messages whatsoever on the Teensy, not even some garbled mess suggesting that it's a translation issue. The only thing I can think of is that the LC2 doesn't actually use RS232. But I don't have a scope to check the TX voltage (and I don't want to fry my microcontroller if I'm wrong)
Code is simple:
Code: Select all
#define HWSERIAL Serial1
void setup() {
Serial.begin(9600);
HWSERIAL.begin(19200, SERIAL_8N1);
}
void loop() {
int incomingByte;
if (Serial.available() > 0) {
incomingByte = Serial.read();
Serial.print("USB received: ");
Serial.println(incomingByte, DEC);
//HWSERIAL.print("USB received:");
//HWSERIAL.println(incomingByte, DEC);
}
if (HWSERIAL.available() > 0) {
incomingByte = HWSERIAL.read();
Serial.print("UART received: ");
Serial.println(incomingByte, DEC);
//HWSERIAL.print("UART received:");
//HWSERIAL.println(incomingByte, DEC);
}
}
