All FF in results

[rogueturnip]

When I load this into my Arduino Uno connected to a DSC 1832 all I end up getting is all FF's in the display. Is there a timing issue that I'm not aware of? I go this with the Interrupt version. I tried the loop version but it printed similar information but crashed after 5 lines.

DSC KeyBus Gateway 0.1

M [B: 8 b: 58]: FF 3 FF FF FF FF FF FF F C: FF 3 FF FF FF FF FF FF 7
M [B: 8 b: 58]: FF 1F FF FF FF FF FF FF 1F C: FF 7 FF FF FF FF FF FF F
M [B: 7 b: 52]: FF 1F FF FF FF FF FF 3F C: FF 7 FF FF FF FF FF 3F
M [B: 7 b: 52]: FF 3F FF FF FF FF FF F C: FF 7 FF FF FF FF FF 1F
M [B: 7 b: 52]: FF 1F FF FF FF FF FF F C: FF 7 FF FF FF FF FF 3F
M [B: 7 b: 52]: FF 1F FF FF FF FF FF 3F C: FF 7 FF FF FF FF FF 3F
M [B: 7 b: 52]: FF 7F FF FF FF FF FF F C: FF 7 FF FF FF FF FF 1F
M [B: 7 b: 52]: FF 1F FF FF FF FF FF 3F C: FF 7 FF FF FF FF FF 1F

[denvera]

I've seen this when CLK/DATA are swapped, or the data line is not being pulled low for some reason.

[rogueturnip]

Thanks!

I checked the pins and CLK is wired to yellow and data is green. The circuit I’m using is

https://raw.githubusercontent.com/emcniece/Arduino-Keybus/master/connections.png

I’ve redone the pins to match 2 and 3 in the sketch.

I also notice that on the data line input it's define as INPUT_PULLUP but you mentioned it needs to be pulled low.

[rogueturnip]

I scoped it today and it looks like the data line isn't being pulled low. What is odd is that the keypad works. I even scoped it from the panel terminals and the data looks high even during the sync.

It's odd, every capture between clock signals is exactly the same wave form.