How to do with AREF_DIFF of CR_PACK?

Hi,

  We have two inputs. One is singal. The other is ground. 
  For example, we use analog channel 0 for singnal and analog channel 8 for ground.

  I read comedi documentation. Keyword AREF_DIFF is for differential inputs/outputs.

  But how to config? Is any demo code?
  Thanks a lot.

Best regards, 

Cheng-Ling Kuo(³¢¬FÆF)

Tel:+886-6-2757575-65276 
Fax:+886-6-2096035 
 
Assistant Engineer 
Science Data Distribution Center 
ISUAL Project, The Scientific Payload of ROCSAT-2 
Department of Physics 
National Cheng Kung University 
(http://www.phys.ncku.edu.tw)  

Received on 2003-05-21Z01:10:04