My C02 module is designed to trace DCC Railcom traffic for decoder debugging and development purposes. In particular the Railcom capture is an important feature and helps to validate if a decoders is RCN-217 compliant. The C02 uses the Vt100 terminal emulation control codes for its user interface. Therefore a VT100 capeable terminal program is a must (e.g. putty, teraterm). The USB interface is galvanically isolated from the DCC track potential.
User Guides
- User Guide - DE
- User Guide - EN
My current PCB layout uses SMD footprints with 0.5mm pitch and mostly 0603 but some 0402 parts. Reflow soldering is my recommendation, but with some experience handsoldering may also be possible.
- 4-layer PCB, FR4, 1.6mm
- CPU: mega328pb
- USB: FT232x (Mini-B)
- DC/DC: NME0505SC (or compatible)
Filename structure: { pcb }{ code }{ version }.hex
Example: C02F0001.hex
| Description | |
|---|---|
| pcb | Name of matching hardware (C02) |
| code | Type of code contained (R=rom, B=bootloader, F=flash, U=bld update, P=UPDI/SPI factory code) |
| version | Release version (####) |
The fuse settings as well as the P-code (C02Pxxxx.hex) has to be installed by using the ISP.
Details
CAUTION: Before connecting the ISP, the jumper next to the ISP 6-pin interface must be closed (yellow jumper on picture).
| Fuses Setting | Bootloader Install |
|---|---|
 |
 |
Subsequent main code updates can be done via uploading the new firmware (C02Fxxxx.hex) file to the bootloader console prompt.
Details
-
press F1 to switch to console screen
-
press ^b (ctrl-b) to enter bootloader
-
upload the firmware file (C02Fxxxx.hex)
-
press x to exit the bootloader
Operating the C02 is within the terminal window.
Below some example screens of the different functional sections. The screens (called aspects) can be switched by pressing F1-F7. All screens are updated in real-time speed, ensuring always up-to-date information shown.
| Aspect | Example |
|---|---|
| F1: Console prompt. |  |
| F2: DCC/Railcom line by line real-time trace. |  |
| F3: DCC/Railcom decoder payload |  |
| F4: DCC/Railcom timing |
 |
| F5: DCC command set |  |
| F6: Railcom response set |  |
This is how the PCB looks like.
Some short videos to see the DCC/Railcom logger in action.
