9
Chapter 3
Functional Details
Components
The USB-ERB08 has the following internal components, as shown in Figure 5.
Two (2) USB connectors
Two (2) external power connectors
USB LED
PWR LED
Invert/non-invert switch (S1) — sets the relay control logic polarity
Pull-up/down switch (S2) — sets the relay power-on state
Screw terminals
1 USB output connector (
USB OUT
)
6 Invert/non-invert switch (
S1
)
2 USB input connector (
USB IN
)
7
USB
LED
3 Power output connector (
POWER OUT
) 8
PWR
LED
4 Power input connector (
POWER IN
)
9 Pull-up/down switch (
S2
)
5 Screw terminals
Figure 5. USB-ERB08 components
USB in connector
The USB in connector is labeled
USB IN
on the board and enclosure. This connector is a USB 2.0 full-speed
input connector that you connect to the USB port on your computer (or USB hub connected to your computer).
This connector supports USB 1.1 and USB 2.0 devices. Revision E and later devices are also compatible with
USB 3.0 ports.
USB out connector
The USB out connector is labeled
USB OUT
on the board and enclosure. This connector is a downstream hub
output port intended for use with other MCC devices that support daisy chaining. The USB hub is self-powered,
and can provide
100 mA
maximum current at 5 V. Note that a user-supplied custom cable is required to daisy
chain multiple devices.
