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 WM_HWD_SK_UGD_002 - 002 
6/27/2003 
 
3  Description of the Interfaces 
3.1 Power 
A  standard  DC  Power  Jack  is  provided  on the Interface Board.  The included 
Power Adapter can be used to supply the Module and Interface Board via this 
jack. 
 
Alternatively a lab power supply capable of supplying at least 3.8Vdc at 
2.0Amps can be used.  The advantage of the lab power supply is in allowing 
the user to monitor the current drain of the Module to help determine its 
operating state. 
 
The Power Jack has a center positive connection, if a lab supply or other 
external source is used.  A cable for this purpose is available. 
3.2 Computer 
The Interface Board communicates with the controlling PC through standard 
RS-232 Interfaces.  Two such interfaces are provided, however the typical 
customer application will only require one of these (DATA). 
3.2.1 DATA 
The DATA Interface, J200, provides a full 8 wire RS-232 interface with the PC.  
This interface supports the AT Commands; the Diagnostic (DM) information; 
and high speed data.   
 
Light Emitting Diodes (LEDs) for this port are included on the Interface Board 
on the RX, TX, DTR, DSR, RTS, CTS and DCD lines to indicate the state of the 
line.  The red LED indicates a negative voltage on the RS-232 (Logic 1) and the 
green LED indicates a positive voltage on the RS-232 (Logic 0). 
3.2.2 DM 
The DM Interface, J201, provides a 2 wire RS-232 interface for Diagnostic 
information only.  The typical customer application should not require this 
interface as all functionality of the DM Interface is now supported through the 
DATA Interface as well.   
 
Light Emitting Diodes (LEDs) for this port are included on the Interface Board 
on both the RX and TX lines to indicate the state of the line.  The red LED 
indicates a negative voltage on the RS-232 (Logic 1) and the green LED 
indicates a positive voltage on the RS-232 (Logic 0). 
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