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Receiving data from National Control Device Relay Board

Question asked by Bruce on Jan 6, 2013
Latest reply on Jan 6, 2013 by changmeikuan
I’m using a National Control Devices ProXR_USB relay board and I’m having trouble receiving a response.  
I’m able to control the relays but I’m not having much luck with receiving reply’s from the board,  Vee errors out -118.    
If i send bytes 170 2 254 108 1 24 the relay i want closes so I know im talking to the board

If i send the bytes to request the a/d status,   then set a read command i Vee errors out.

If I send bytes 170 2 254 166 80  
Expected reply is 170 8 255 255  255 255 255 255 255 255 170

Can someone give me a little guidance?