Data Sheet

MD04 communication configuration

First step - get the drivers

The MD04 uses a virtual comm port for setting the communication method. Before connecting the

module you should download the driver and unzip it. Now connect the USB cable and navigate

windows to the folder and install the driver, the MD04 will now appear as a COM port.

Setting the communication type

Now the MD04 appears as a comm port we have a simple set of commands to switch between the

communication options and settings. An app to easily change between settings is available on the next

page.

Command Name Response / additional parameters

0x24 Read Temperature 1 byte response - the PCB temperature in °C

0x25 Read Version 1 byte response - current software version

0x27 Read Mode 1 byte response - current mode of operation

0x28 Read Status 1 byte response - see status byte makeup

0x29 Read Baud 2 byte response - see baud rate calculation and table

0x34 Write Mode Send 1 additional byte for the mode from table below

0x35 Write Baud Send 2 additional bytes to set baud from calculation or table

Operation modes

Value Mode

0 I2C @ 0xB0

1 I2C @ 0xB2

2 I2C @ 0xB4

3 I2C @ 0xB6

4 I2C @ 0xB8

5 I2C @ 0xBA

6 I2C @ 0xBC

7 I2C @ 0xBE

8 Analogue 0v-2.5v-5v

9 Analogue 0v-5v

10 RC mode with timeout

11 RC Mode no timeout

12 Serial

Calculated baud rates for serial mode

Baud rate Value

300 9999

1200 2499

2400 1249

9600 311

10417 287

19.2k 155

57.6k 51

115.2k 25

Value = (48,000,000/(16* baud rate)) – 1

Because 48mhz may not divide into baud rate

exactly:

Actual baud rate = 48,000,000/(16 * (Value+1))