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TB008  HYDRA-II INTERFACE CONTROL CHECKS
 
                J.D.S. MicroProcessing Technical Bulletin             

Date Written: 08/20/89                   Submitted by: R. Sande     
    Sequence: 1 of 1                           FileID: 4.TB008      

                                                                        
                      HYDRAII INTERFACE CONTROL CHECKS                        
                                              
                                                                        
    Interface control checks are usually caused by poorly genned UCW's  
or a dead or defective HydraII unit. Sometimes it may not be a problem
with a Hydra unit at all but with a conflicting address assignment on   
another control unit attached to the channel.                           
                                                                        
    Check for bent or damaged channel cable pins. Check to make sure    
that the channel cable is not exceeding a maximum length of 200 total   
aggregate feet. It is not uncommon to find the UCW's altered              
inadvertently.