Standalone Usage¶
Start by cloning this repository:
git clone https://github.com/chintal/driver2200087.git driver2200087
or the original by David Dworken:
git clone https://github.com/ddworken/2200087-Serial-Protocol.git
Then install dependencies:
pip install numpy pyserial
Then you’re ready to go. Just run the program to display a text output of the data:
sudo python serialDecoder.py -p /dev/ttyUSB0
If you want a graph as your output, first install GNUPlot:
sudo apt-get install gnuplot
then run:
sudo python serialDecoder.py -p /dev/ttyUSB0 --graph
You also can read from multiple multimeters at the same time and get a CSV output like so:
sudo python serialDecoder.py -p /dev/ttyUSB0 /dev/ttyUSB1
If you only want the actual values and not information about what mode the multimeter is on, use the -q flag:
sudo python serialDecoder.py -p /dev/ttyUSB0 -q
2200087 Serial Protocol Description¶
| Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 | |
|---|---|---|---|---|---|---|---|---|
| Byte 1 | 0 | 0 | 0 | 1 | Minus | AC | SEND | AUTO |
| Byte 2 | 0 | 0 | 1 | 0 | Continuity | Diode | Low Batt | Hold |
| Byte 3 | 0 | 0 | 1 | 1 | MAX | E4 | F4 | A4 |
| Byte 4 | 0 | 1 | 0 | 0 | D4 | C4 | G4 | B4 |
| Byte 5 | 0 | 1 | 0 | 1 | DP3 | E3 | F3 | A3 |
| Byte 6 | 0 | 1 | 1 | 0 | D3 | C3 | G3 | B3 |
| Byte 7 | 0 | 1 | 1 | 1 | DP2 | E2 | F2 | A2 |
| Byte 8 | 1 | 0 | 0 | 0 | D2 | C2 | G2 | B2 |
| Byte 9 | 1 | 0 | 0 | 1 | DP1 | E1 | F1 | A1 |
| Byte 10 | 1 | 0 | 1 | 0 | D1 | C1 | G1 | B1 |
| Byte 11 | 1 | 0 | 1 | 1 | Percent | HFE | Rel Delta | MIN |
| Byte 12 | 1 | 1 | 0 | 0 | u (1e-6) | n (1e-9) | dBm | Seconds |
| Byte 13 | 1 | 1 | 0 | 1 | Farads | Amps | Volts | m (1e-3) |
| Byte 14 | 1 | 1 | 1 | 0 | Hz | Ohms | K (1e3) | M (1e6) |
All bytes are sent over in hexadecimal numbered one through fourteen. Bytes 3-4 contain digit 4, bytes 5-6 contain digit 3 and so on. All other parts of the display are turned on as shown in the above table. The multimeter sends the data at a rate of 10 Hz.
