Measurement-computing USB-ERB08 Instrukcja Użytkownika Pobierz pdf (Strona 20)

USB-ERB08 User's Guide Specifications

External power input

Table 3. External power input specifications

Parameter Conditions Specification

External power input

+6.0 VDC to 12.5 VDC (9 VDC

power supply included)

6.0 V > Vext or Vext > 12.5 V PWR LED = Off (power fault)

Voltage supervisor limits - PWR LED

(Note 1)

6.0 V < Vext < 12.5 V PWR LED = On

External power adapter (included) MCC p/n CB-PWR-9 +9 V ±10%, @ 1 A

Note 1: The USB-ERB08 monitors the external +9 V power supply voltage with a voltage supervisory

circuit. If this power supply exceeds its specified limit, the PWR LED will turn off indicating a

power fault condition.

External power output

Table 4. External power output specifications

Parameter Conditions Specification

External power output - current range

4.0 A max.

External power output (Note 2)

Voltage drop between power input and daisy

chain power output

0.5 V max

Compatible cable(s) for daisy chain C-MAPWR-x x = 2 , 3, or 6 feet

Note 2: The daisy chain power output option allows multiple Measurement Computing USB boards to be

powered from a single external power source in a daisy chain fashion. The voltage drop between

the module power supply input and the daisy chain output is 0.5 V max. Users must plan for this

drop to ensure the last module in the chain will receive at least 6.0 VDC.

USB specifications

Table 5. USB specifications

USB "B" connector Input

USB device type USB 2.0 (full-speed)

Device compatibility USB 1.1, USB 2.0

USB "A" connector Downstream hub output port

Supports USB 2.0 high-speed, full-speed and low-speed operating points USB hub type

Self-powered, 100 mA max downstream VBUS capability

Compatible products MCC USB Series devices

USB cable type (upstream and downstream)

A-B cable, UL type AWM 2527 or equivalent.

(min 24 AWG VBUS/GND, min 28 AWG D+/D-)

USB cable length 3 meters max.

Relay contact pull-up/down option

Table 6. Relay pull-up/pull-down specifications

R1, R3, R5, R7, R10, R12, R14, R16 Relays NO contact pull-up (to USB +5V) / pull-down

R2, R4, R6, R8, R9, R11, R13, R15 Relays NC contact pull-up (to USB +5V) / pull-down

4-2

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