Usb Specifications; Digital I/O Transfer Rates; Mechanical - Measurement Computing USB-SSR08 User Manual

USB-SSR08 User's Guide
The USB-SSR08 monitors the external +9 V power supply voltage with a voltage supervisory
Note 1:
circuit. If this power supply exceeds its specified limit, the PWR LED will turn off indicating a
power fault condition.
External power output
Parameter
External power output - current range
External power output (Note 2)
Compatible cable(s) for daisy chain
The daisy chain power output option allows multiple Measurement Computing USB boards to be
Note 2:
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

USB "B" connector
USB device type
Device compatibility
USB "A" connector
USB hub type
Compatible products
USB cable type (upstream and
downstream)
USB cable length

Digital I/O transfer rates

Digital I/O transfer rate (software
paced)

Mechanical

Card dimensions without modules
Enclosure dimensions
Table 4. External power output specifications
Conditions
Voltage drop between power input and daisy
chain power output
C-MAPWR-x
Table 5. USB specifications
Input
USB 2.0 (full-speed)
USB 1.1, USB 2.0
Downstream hub output port
Supports USB 2.0 high-speed, full-speed and low-speed operating points
Self-powered, 100 mA max downstream VBUS capability
MCC USB Series devices
A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND, min
28 AWG D+/D-)
3 meters max.
Table 6. Digital I/O transfer rate specifications
System dependent, 33 to 1000 port reads/writes or single bit reads/writes per
second typ.
Table 7. Mechanical specifications
203.2 mm (L) x 121.9 mm (W) x 22.5 mm (H)
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)
8.2" (L) x 5.2" (W)x 2.5" (H)
4-2
Specifications
Specification
4.0 A max.
0.5 V max
X= 2 , 3, or 6 feet