Measurement Computing IOtech 640 Series - Manual (Page 39)

640 & 650 Series 889793 Configuring USB Models 640u & 650u 5-3
USB Connection and System Power-up
As this document goes to print, USB connectivity can only be used with
Windows 2000 or Windows XP operating systems.
Overview
IOtech 640u and 650u units transfer the acquired data to the PC via a USB2.0 connection. When a
computer has a board with USB 2.0 ports, an “Enhanced” USB controller can be found in the Device
Manager. The Device Manager will also show two other USB controllers. This is due to the fact that
USB2.0 circuitry includes 3 chips [one for the actual USB2.0 capable devices and two for backward
USB1.1 compatibility]. Thus a USB 2.0 motherboard can host any USB device (version 2.0 or lower),
assuming there are no defects with the board, system, and/or device.
USB Notes:
o IOtech 640u and IOtech 650u require connection to USB2.0
o USB 1.1 (obsolete) hubs will work on USB 2.0 ports, but cannot utilize USB 2.0 capabilities.
o Hi-Speed and Full/Low-Speed USB devices can coexist on USB 2.0 hubs.
o USB 2.0 hubs can be used on computers with USB 1.1 ports, but will not exhibit USB 2.0
capabilities.
o Minimize hub use and keep USB cables as short as possible.
o If you do not want to power the 640u or 650u from a USB2.0 port, connect a TR-2U power
adapter to the unit’s External Power jack.
640u or 650u, Rear Panel
IOtech 640u and 650u connect directly to a USB port on the PC [or USB2.0 hub] via the unit’s built in
USB2.0 interface. A CA-179-1 (or -3, or -5) USB cable is used to make the connection.
CAUTION
Turn off power to the system devices and externally connected equipment before connecting cables.
Electric shock or damage to equipment can result even under low-voltage conditions.
Take ESD precautions (packaging, proper handling, grounded wrist strap, etc.)