Справочник Пользователя для Sierra Wireless Q2438F

 WM_HWD_SK_UGD_002 - 002 

6/27/2003 

 

3.3 Switches and Jumpers 

3.3.1 ON/OFF Switch 

There is a slide switch, SW101, located on the back edge of the Interface 

Board.    This  switch  interfaces  directly  to  the  ON/OFF  control  line  of  the 

Module, via pin 6 of the board-to-board connector.  Sliding the switch in the 

“OFF” direction will pull the line low, causing the Module to shut off.  Sliding 
the switch in the “ON” direction will pull the line high, turning on the Module 

and keeping it in the ON state. 

3.3.2 BOOT Switch 

A second slide switch, SW102, is located on the back edge of the Interface 

Board, beside the ON/OFF switch.  The function of this switch depends on if a 

CDMA Module or GSM/GPRS Module is being used. 

 

For normal operation of the GSM Module, this switch must be in the HI 
position upon power up or reset.  This switch when in the LO position will put 

the GSM Module into its BOOT Mode.  This allows software upgrades to the 

embedded code within the Module, via the serial interface of the Interface 

Board and an application such as the Wavecom DWLWin program.  Note that 

the  switch  must  be  in  the  LO  state  upon  power  up  or  reset.    Once  the 

embedded code is executing, the status  of  the  BOOT  input  is  no  longer 

monitored.   

 

For  the  CDMA  Modules,  there  is  no  need  for  this  BOOT  functionality.    Thus 

this  switch  is  for  test  purposes  only  and  is  connected  to  GPIO  42  of  the 

Module.  The input can be pulled LO or HI and monitored via AT Command 

Queries if needed. 

3.3.3 RESET Switch 

There is a master push button reset switch, SW100, located in the middle of 

the Interface Board that when depressed will pull the RESET/ line of the 

Module to Ground, causing a full Module microprocessor reset. 

3.3.4 SNGL/DIFF Jumper 

A four-pin jumper, J303, is located near the Audio connectors.  This is used to 

configure the Headset Audio for either a single ended or differential speaker 

drive circuit.  Silkscreen on the Interface Board indicates the jumper positions 

required for either case.  For Differential,  one  jumper  should  be  placed  across 

pins 2 and 3.  For Single Ended, two jumpers should be placed; one across 

pins 1 and 2, and the other across pins 3 and 4.  Refer to 

 for more 

details on the functionality of this jumper block. 

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