INFICON STM-2 USB Thin Film Rate/Thickness Monitor - Manual (Page 25)

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STM-2 Operating Manual
2.4 STM-2 Indicators
2.4.1 Power
Illuminated . . . . . . . . . . . . . . . . . . . . STM-2 is powered up and is connected to a
good crystal.
The host computer has initialized STM-2 by
returning a reset status when the software
begins communication.
Flashing fast . . . . . . . . . . . . . . . . . . . STM-2 is powered up but cannot detect a
good crystal.
Blinking slow
(approximately once per second) . . . STM-2 is powered up and the crystal is good,
but the computer application has not
initialized STM-2. Once the computer
initializes STM-2 the indicator will illuminate
continuously (see
section 6.1.1 on page 6-1 ).
Extinguished. . . . . . . . . . . . . . . . . . . STM-2 does not have power. Check the USB
connection, and make sure the computer is
turned on.
2.4.2 USB
The USB indicator detects communications signal traffic.
Illuminated . . . . . . . . . . . . . . . . . . . . STM-2 is connected and communicating to a
host computer. Communications
sent/received every 100 ms will cause the
indicator to be steadily illuminated.
Flashing . . . . . . . . . . . . . . . . . . . . . . STM-2 is connected and communicating to a
host computer. A flashing indicator will
correspond to the time elapsed between sent
and received communications. A query sent
once per second will correspond to the
indicator flashing approximately once per
second.
Extinguished. . . . . . . . . . . . . . . . . . . STM-2 is not communicating to the
computer.
NOTE: STM-x_win32 LabVIEW application software and INFICON STM-2
software will steadily illuminate the indicator due to communications
queries sent every 100 ms. User-created software may not steadily
illuminate the indicator due a longer time period elapsing between
communications queries being sent.