External Power Connectors; Usb Led; Pwr Led; I/O Module Type Switch (S1) - Measurement Computing USB-SSR08 User Manual

USB-SSR08 User's Guide

External power connectors

The USB-SSR08 has two external power connectors labeled
The connector is labeled
POWER IN
on the board.
OUT
Connect the
POWER IN
operate the USB-SSR08. The
Series products from a single external power supply. Depending on your load requirements, daisy chained
products may require a separate power supply. Refer to
on page 3-4 for more information.

USB LED

The LED indicates the communication status of the USB-SSR08. This LED uses up to 5 mA of current
USB
and cannot be disabled.
LED Illumination Indication
Steady green The USB-SSR08 is connected to a computer or external USB hub.
Pulsing green Initial communication is established between the USB-SSR08 and the computer, or data is being
transferred.

PWR LED

The USB-SSR08 incorporates an on-board voltage supervisory circuit that monitors the external 9 V power. If
the input voltage falls outside of the specified ranges the
the PWR LED.
PWR LED Indication
illumination
Steady green External power is supplied to the USB-SSR08.
Off Power is not supplied by the external power supply, or a power fault has occurred. A power fault
occurs when the input power falls outside of the specified voltage range of the external supply
(6.0 V to 12.5 V).

I/O module type switch (S1)

Switch is a four-position switch that sets the type of each module group for input or output (default). You
S1
cannot mix input and output modules within a group. You can use InstaCal to read the current I/O type
configuration for each module group.
on the board, and the
PWR IN
connector to the supplied +9 V external power supply. External power is required to
connector lets you power additional daisy chained MCC USB
POWER OUT
Table 3-2 explains the function of the USB LED.
Table 3-2. USB LED Illumination
Table 3-3. PWR LED Illumination
Figure 3-2 shows switch S1 configured with its default settings.
IN
Figure 3-2. Switch S1 default configuration
and
POWER IN
POWER OUT
"Power limitations using multiple USB-SSR08
LED shuts off. Tab
PWR
CH
CL
S1
OUT
3-2
Functional Details
on the enclosure.
POWER OUT
connector is labeled
le 3-3 explains the function of
PWR
devices"