I recently acquired a PR49-35_NCD5500 to communicate with two 5v I2C devices. The devices are externally powered so I made a 4-pin connector with only clock and data lines and wired those in to the correct spot on the first slave device in the chain. With everything wired up I used both AnyI2C and AlphaStation to attempt a bus scan to see the devices, 0xFF result. I hooked the slave device chain up to a fusion board on port 1 and verified that I can indeed see and communicate with the slave devices normally from the fusion board. I double checked the clock and data lines with the schematic for the PR49-35_NCD5500 to verify the lines are not switched and hooked up to the PR49-35_NCD5500 again. Bus scan is still empty. Not sure what my next debugging step should be here, any ideas?