Measurement Computing USB-SSR08, Руководство пользователя

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USB-SSR08 User's Guide Specifications
The USB-SSR08 monitors the ex9 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.
Note 1:
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 assure 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.
Digital I/O transfer rates
Table 6. Digital I/O transfer rate specifications
Digital I/O transfer rate (software
paced) System dependent, 33 to 1000 port reads/writes or single bit reads/writes per
second typ.
Mechanical
Table 7. Mechanical specifications
203.2 mm (L) x 121.9 mm (W) x 22.5 mm (H) Card dimensions without modules
8.0" (L) x 4.8" (W) x 0.885" (H)
208.3 mm (L) x 132.1 mm (W) x 63.8 mm (H)
Enclosure dimensions
8.2" (L) x 5.2" (W)x 2.5" (H)
4-2