The top of the case can be snapped off (4 clips on both short ends). The circuit board is not attached to the case and can be easily removed. Built-in snap-action switches short the control line to ground to activate a specific USB port. These control lines are pulled up to about +4.8 VDC. However, the USB switch function is only activated with a rising edge (e.g. when switching from ground to open). Also, the alternate control line must remain high for the other line to activate. When controlled by logic, you need a pulse to activate each of them. So I don't have to build the whole logic circuit, I use two instantaneous control lines and a ground. Another reviewer here used a simple SPDT switch, but I suspect the switch's action activates the opposite port (which is normal) and may cause bounce issues. Some problems with this device: 1. The built-in A/B switching function can be intermittent, sometimes requiring you to press the desired switch multiple times. This suggests that Plugable didn't properly fix the switch toggling, but most users don't mind; The LED lights seem to constantly show the actual working port. Use with an external logic control line that operates at 100% on the rising edge.2. The device sends 5VDC from type B ports to a normal port (type A?) (not sure if it also goes from B to B). This may be required by most users; I don't know as it is connected to a Raspberry Pi3 (controversial info on whether this spare power/passthrough is an issue). However, I plan to cut an A/B wire to expose the RED line (+5VDC).3. Looking at Ports B, switch up, it appears that rightmost Port B is used by default on power-up, no matter which Port B is connected (or both). until he's gone But don't trust that 100% because they forgot to debounce the switches.
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