I misplaced your description, but I believe this is what you wanted. The 166 SSDN looks the same for all properties: +-----------------------+ | 0 | +-----------------------+ | 0 | 32 (hex) | +-----------------------+ | crate | slot | +-----------------------+ | 32 (hex) | 0 | +-----------------------+ The various data base properties map onto the module camac functions as follows: Function Property Meaning -------- -------- ------- F(2)A(0) READING EXTERNAL TRANSMIT DATA REGISTER F(16)A(0) SETTING CAMAC TRANSMIT DATA REGISTER F(0)A(0) READ-THE-SETTING " " " " F(1)A(0) BASIC STATUS For the basic control property you send one word containing a code as follows: Code Function Meaning ---- -------- ------- 1 F(24)A(0) ENABLE CAMAC TRANSMISSION / DISABLE EXTERNAL 2 F(26)A(0) DISABLE CAMAC TRANSMISSION / ENABLE EXTERNAL 3 F(9)A(0) RESET 4 F(28)A(0) EXTERNAL TRANSMISSION OFF 5 F(30)A(0) EXTERNAL TRANSMISSION TRIGGER ON This is all implemeted, but exists only in Dec-P at the moment. It should go into Dec-T and Dec-S sometime Thursday or Friday. If I got anything wrong, it is trivial to change it.