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Measurement-computing USB-ERB24 Manual de usuario Pagina 16

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USB-ERB24 User's Guide Functional Details
USB LED
The USB LED indicates the communication status of the USB-ERB24. It uses up to 5 mA of current and cannot
be disabled. explains the USB LED function. Table 3-2
Table 3-2. USB LED Illumination
USB LED
illumination
Indication
Steady green The USB-ERB24 is connected to a computer or external USB hub.
Pulsing green
Initial communication is established between the USB-ERB24 and the computer, or data is being
transferred.
PWR LED
The USB-ERB24 incorporates an on-board voltage supervisory circuit that monitors the external 9 V power. If
the input voltage falls outside of the specified range, the
PWR LED shuts off. explains the function of
the PWR LED.
Table 3-3
Table 3-3. PWR LED Illumination
PWR LED
illumination
Indication
Steady green External power is supplied to the USB-ERB24.
Off
Power is not supplied by the external 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).
Invert/non-invert switch (S1)
The Invert/non-invert switch (S1) sets the relay control logic per relay bank to either inverted or non-inverted.
By default, switch S1 is configured for non-invert (see ). Figure 3-2
Figure 3-2. Switch S1 default configuration
NON-INVERTINVERT
S1
CL
CH
A
B
The switch labeled A configures relays 1 through 8, the switch labeled B configures relays 9 through 16, the
switch labeled
CH configures relays 17 through 20, the switch labeled CL configures relays 21 through 24.
NON-INVERT: when "0" is written or read back via the USB bus, the relays are not energized.
INVERT: when "0" is written or read back via the USB bus, the relays are energized.
Switch settings do not affect the power-on condition. Use InstaCal to read the current logic setting for each
module group.
3-2
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