© 2009 Cypress Solutions
Complete Manual: CTM-15X Firmware 1.2.0
(Revision 1.0)
20
2BOperating Your Modem
TX/RX
data is being
transmitted or
received
N/A
Data is being
transmitted or
received
no data is being
transmitted or
received
GPS
status of the GPS
module
GPS module has
obtained a valid
position fix
GPS module does not
have a valid position
fix
3G
indicates the type of
wireless data
connection
N/A
N/A
N/A)
3.5
Making a Wireless Network Connection
The CTM-15X will attempt to connect to the wireless network whenever power is applied, when
configured with cmd mode 2
(default)
If no wireless network connection is available the IP address will be given as 0.0.0.0. This can be queried
using cmd ipadr For Sierra Wireless RF devices, wireless signal strength information can be queried using
cmd rssi. These values for both 1x and EV
-DO are given in dBm with range typically -
60dBm (very good) to
-
105dBm (weak).
With the wireless network connection active you may now open Windows® applications that will make
use of this connection – this includes email, web browsers, and VPN connections.
3.6
GPS Operation
The GPS module in the CTM-15X Modem will continuously track the unit’s position whenever power is
applied and the GPS antenna has a clear view of the sky. The time taken for the module to achieve a valid
positional fix is determined by the previous state of the unit:
For a “cold” start (after all power is applied to the modem) the acquisition time t
ypically will be less than
50 seconds.
For a “warm” start (standby power is maintained to the CTM
-
15x) the acquisition time will typically be
less than 38 seconds.
For reacquisition (after the GPS module has temporarily lost signal) the time to acquire a
valid position fix
is typically less than 2 seconds.
The GPS information can be sent by the device as a message in any of the configured reports.
The GPS receiver uses the WGS-
84 datum.
