I am using this thread to help send commands to an 841.  I can SSH in and send the below command:

cgminer --lowmem --avalon8-fan 40-100 --avalon8-voltage-level-offset 0 {REDACTED POOL} --api-allow W:0/0 --api-listen --avalon8-voltage-level 0 --avalon8-voltage-level-offset 0 --real-quiet

The only way this works is if I first stop the cgminer (/etc/init.d/cgminer stop) and then send the above command.  The problem is after that it seems that I am locked out from stopping or sending new commands (for instance, set voltage level 1 with the above command with modifier). 

It seems that I am shutting down the default running cgminer and then starting a new one.  Is this correct?  Is there a better way to be able to toggle? 

Thanks in advance