Measurement Computing IOtech 640 Series - Manual (Page 16)

2-2 Block Diagram 878893 IOtech 640/650 Series
General Comments
Ethernet Connection (640e and 650e models only)
IOtech 640e and 650e units transfer the acquired data to the PC via a 10/100BaseT Ethernet connection.
The Ethernet connection allows for a continuous stream of data to be collected and stored.
The 10/100BaseT Ethernet interface can be used in a point-to-point application, such as when attached to a
notebook PC and used in the field. In this case the 16 Mbytes of buffer storage built into the unit is
adequate to ensure that continuous data transfers to the PC can occur without risk of data loss.
The 10/100BaseT Ethernet interface can also be used to connect the unit to a network, presuming the
network has enough available bandwidth. The network bandwidth required is a function of the number of
signals being measured, and the bandwidth of the signals.
USB Connection (640u and 650u models only)
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 Regardless of the USB hub or port used, if power to the 640u or 650u device is insufficient,
connect a TR-2U power adapter to the unit’s External Power jack.
Power
640e and 650e units can be powered directly from a 6 to 16 VDC source. They can also be powered from
a 100 to 250 VAC source via its power adapter, which converts the AC to the required DC.
640u and 650u units can be powered solely from a USB2.0 bus, or optionally from a 6 to 16 VDC source
via the external power connector.
LEDs 640 and 650 Series modules have 2 LEDs on the front panel. The LEDs function as follows:
Power LED: The “Power” LED blinks during device detection and initialization; then remains on solid
as long as the module has power. If there is insufficient power the LED will go off.
Active LED: This LED is on whenever active communication is taking place between the 640/650 and
the host PC. Note that the Active LED will be on solid during a data acquisition.