Thanks for responding.   Yes, I’m using 9600 baud.  Here is the Arduino test script which attempts to control the dc-dc converter:

#include <BuckPSU.h>

BuckPSU psu(Serial);

void setup() {
Serial.begin(9600);

Serial.println(“Initialising PSU…”);
psu.setVoltageMilliVolts(12000);
psu.setCurrentMilliAmps(100);
psu.enableOutput(true);
}

void loop()  {
Serial.print(psu.readVoltageMilliVolts());
Serial.print(“Voltage (mV): “);
Serial.print(psu.readCurrentMilliAmps());
Serial.print(“\tCurrent (mA): “);
Serial.println(psu.getOutputEnabled());
Serial.print(“\tOutput enabled?: “);

delay(500);
}

and which outputs:

11:07:50.570 -> Initialising PSU…
11:07:50.615 -> awu1200
11:07:50.615 -> awi0010
11:07:50.615 -> awo1
11:07:50.615 -> Voltage (mV): aru
11:07:53.580 -> 0 Current (mA): ari
11:07:56.598 -> 0 Output enabled?: aro
11:07:57.598 -> 0
11:07:58.100 -> Voltage (mV): aru
11:08:01.111 -> 0 Current (mA): ari
11:08:04.083 -> 0 Output enabled?: aro
11:08:05.089 -> 0

The wiring looks like this:

I get the same result at either data rate (4800, 9600) or swapping Tx/Rx: no activity on the Drok Tx pin.   Please suggest a way to test the correct operation of the 200310 device.  Could I have damaged it putting 5.2v on Vin and Tx, Rx of its serial port?

Please clarify what you mean by “current setting”.  Since I am sending commands from an Arduino Uno R3 microcontroller to the 200310 buck dc-dc converter through a serial connection, the only screenshot I can send to you is of the Arduino Uno R3 IDE configuration.  The test script successfully uploads and executes, showing transmitted commands on the serial monitor, but no responses from the 200310.  Is my 200310 broken?

Hi Sidney,

have you checked the communication address (under F3) is set to the default address -00-.

Otherwise mine module wont response.

Kind regards

Frank

Changing F3 to –00– didn’t get ours communicating over UART. What else can be attempted here? We’ve had older 200310s using UART with no issues. Received 2 new units and neither one will communicate over UART. Tried 9600, tried swapping tx/rx. What has changed?