3051_1B: does white wire in Phidget cable get a signal?

[Rhybot]

I have a Dual Relay Board 3051_1B, and have wired it with a HUB0000_0.

I have:
- One VINT port hooked up to the 3051's 3-pin connector via a Phidget cable
- Two VINT ports sending digital output to 3051's Control 0 and Control 1.

I know the 3051's 3-pin connector is used to power the board (red wire) and provide a ground (black wire). What is the white wire used for?

I see in the 3051's User Guide, it's connected to an analog input. However, when I energize/deenergize the relay, the analog input doesn't pick up a signal.

Can you confirm the white wire is unused?

[fraser]

for the 3051, the white wire isn't hooked up to anything. The device is connected to the analog input purely for providing power to the relays.