Vaisala HMT140 User Manual page 61

Indicator Lights
The red LED on the main board (Center, or below LCD)
indicates that a transmit attempt has just started. The LED
on the radio module indicates that radio module is connected
to the network. When in Transmitter mode the LED will flash
when a connection is made. When in Config mode (the
programming cable is connected to the HMT140) the LED
will remain on continuously when a connection is
established.
Access Points
Some access points have a mode called Auto Channel mode
where it will move between up to 11 channels. If the access
point is using this feature the HMT140 may work properly in
Config mode, but could fail or work very marginally in
Transmitter mode. If the access point is using Auto Channel
mode, make sure the HMT140 has "Auto Find" for the
channel and the right channels have been selected for "Auto
Find" channels.
Some access points will move between three channels
(typically 1, 6 and 11). The HMT140 Utility will work with
these access points with the Channel AutoFind feature but
the channels that are used must match the channels the
HMT140 is configured for.
Transmitter Cycle
In Transmitter mode, it can take up to five seconds for the
transmit cycle to complete. Transmit time is calculated from
when the SERVICE button is pressed to when the
acknowledgement is received from the host.
Is the connect time too long?
If the connect time to the network is consistently long (over
five seconds), the HMT140 may not be able to connect to the
network. If you suspect the connect time to the network is
long:
Use the Test Connect Time tool (see Determining
1
Connection Problems on page 38), or,
Use a PC to connect to the network and then measure the
2
time it takes to connect.
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