30
Monitoring the Wireless Connection to the AMS
Device
The MultiView application communicates with the AMS device by using a Bluetooth wireless link. The wireless link
has a range of up to 30 ft (10 m).
The
Connection
indicator in the
AMS wafer status
area of the MultiView window shows the quality of the wireless
connection between the AMS and the link module. The connection quality is indicated by the color of the bar and
the wording below the bar.
•
Green
—
Connected
. The connection between the link and AMS is good. With a good connection, the AMS
device is sending the maximum number of readings per second to the link module (at least 200 readings per
second).
•
Yellow
—
Poor connection
. There is some interference or other problem with the signal that is preventing the
link and AMS device from communicating at their maximum rate. When the indicator is yellow, the readings
are still accurate but aren’t being updated as frequently.
•
Red
—
No connection
. Indicates that there is no connection between the AMS device and link module. The
values in the display do not update when the indicator is red.
The Bluetooth wireless link technology used in the AMS is a low-power technology that operates in the 2.4 GHz
radio frequency band. This unlicensed band is also used by many other types of devices, such as cordless phones
and microwave ovens. Another 2.4 GHz device operating in close proximity could interfere with the AMS system.
When this happens, separating the devices by at least 6 ft (2 m) usually solves the problem.
Other factors can also affect the wireless link, such as the distance between the AMS device and link, and obstacles
between the device and link that block the signal. If MultiView indicates that the connection isn’t
good, try moving
the wireless link module a few feet closer to the AMS device.
After turning off the AMS, the
Connection
indicator might not change to red for a few seconds.
