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 WM_HWD_SK_UGD_002 - 002 
6/27/2003 
 
3.8.1 LED1 
This LED is red when illuminated, and provides the user with an indication of 
the Module status according to the following table: 
 
LED1 Status 
Module Status 
OFF 
In download mode or OFF 
ON: Permanent 
ON but not registered on a 
network 
ON: Slow Flash 
- 200mS ON, 2S OFF 
ON and registered on a 
network 
ON: Quick Flash 
- 200mS ON, 600mS 
OFF 
ON, registered on a network 
and communication in progress 
 
3.8.2 LED2 
This LED is green when illuminated.  The functionality of this LED can be 
defined to provide a method of test and debug by the user via AT Commands.  
It is connected via pin 54 of the board-to-board connector and is driven by 
GPIO 8 on the CDMA Modules, and GPIO 4 on the GSM/GPRS Modules. 
4 Start-up 
The following gives a description of the connections and configurations 
required to bring up the Module.  Be sure to consider these recommendations 
before applying power to the Interface Board and Module. 
4.1 Connections 
Be sure the Module is securely seated on the Interface Board, and the board-
to-board connector is correctly aligned.  Ideally, the four grounding feet of the 
Module should be soldered to the Interface Board from the bottom side.  If the 
Module is not soldered, an additional grounding clip may be required to 
provide uninterrupted ground to the Module.  Attach the Antenna, via the 
Antenna Adapter, to the Module’s RF Cable. 
 
Connect a serial cable to the DATA Connector on the Interface Board and to an 
unused port on the controlling PC. 
 
Plug the Power Adapter into wall outlet (or alternate Power Supply Cable and 
lab power supply).  Plug the round jack into Power Connector on the Interface 
Board. 
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