Sierra 200 Manual Do Utilizador

  6 

Configuring the CPU Board 

 
Most of the boards in the control system have one or more jumpers that can be set to 
configure the board for various special purposes.  The default configuration will be used 
in most cases.  Refer to the SRS Hardware Reference manuals for more details on each 
board and the various jumper options.  
Here are the default jumper settings for the CPU and RCB boards. 

 

Make sure all CPU board jumpers in properly set. 
 
The CPU board executes the main control system functions including routing the audio, 
controlling the transmitter PTT lines, command decoding, and command response 
telemetry generation.  The CPU board also provides a serial RS-232 connection to a PC 
for controller configuration, and 24 user defined I/O connections including digital 
inputs, analog inputs and buffered digital outputs. 

CPU Jumper Settings 

JU1 - DVB Jumper 
The DVB jumper enables or disables audio from the DVB_bus signal on the backplane.  
This signal is audio generated from the optional Digital Voice Board or DVB.   
"DIS”  In normal operation when not using the DVB, the jumper MUST be in the 

disabled or "DIS" position. 

"EN":    When using the optional DVB in the system, JU1 MUST be in the enabled or 

"EN" position. 

JU2  - Digital Pot Bypass Jumper 
OUT:   Default.  Set telemetry level under CPU control.  This is the normal state for this 

jumper. 

IN: 

Force telemetry pot to mid scale.  This overrides the CPU level set for the master 
telemetry generator. 

JU3 - ICD Power 
OUT:  Default.  For using Con 3, the 10 pin header connector for in-circuit 

progamming. 

IN:  

Install if using Con 5, the modular ICD jack for in-circuit programming. 

NOTE: When using the ICD jack, you MUST cut the trace on the bottom of board to 
enable the ICD power.