However, first we have to understand how this sensor actually works: It is a greysgale gradient with the resolution of a typical x-ray scan.įirst goal was to capture this image and display it.
In fact there is a relais inside that only lowers the CCD and analog circuitry during exposure.įrom the support manual I knew that the DigiPan sends out a test image at powerup. Applying the 5V is enough to get the digital circuitry running. With this information I was able to power my DigiPan once I received it. It works standalone, which makes it perfect for further reverse engineering This is nice, as this means it doesn't require any magical initialization commands or settings transmitted to it to operate normal. This means the panel can only send out data, it can't receive anything from the computer. However, RS422 is a mono-directional interface and there is no second RX channel. So it was still unclear how this thing sends out image data. Unfortunately RS422 is only a specification of the physical layer, not the actual protocol. Also there is some hint of the type of interface this thing uses: RS422. Here is the pinout of a similar type of DigiPan as mine, pinout is identical for both:Īs you can see, the sensor requires 5V (2A) and +/- 15V (700mA). Both power and data goes through this connector. The only connection is a 8-pin DIN plug on a ~20cm long cable. Without his help I probably wouldn't have come so far yet.įirst challenge was to get the DigiPan powered. As it turned out this guy had all the documents I could have wished, including pinouts and confidential powerpoint presentations.
However I contacted a guy on a medical support forum that seemed to know about Trophy devices. Before I got the DigiPan delivered, I did some research on the internet and was rather disappointed to find nothing about this sensors at all.
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