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Conference noted::hackers_v1

Title:-={ H A C K E R S }=-
Notice:Write locked - see NOTED::HACKERS
Moderator:DIEHRD::MORRIS
Created:Thu Feb 20 1986
Last Modified:Mon Aug 03 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:680
Total number of notes:5456

279.0. "hardware hacking a dmf sync channel" by BIGALO::MACKAY_RANDY () Fri Aug 01 1986 11:55

    
    	I need to connect two dmf-32's together and was wondering what
    the easy way to do it . The cable in the user's guide is for connection
    to a modem . I want to set up a decnet link between two vaxes and
    I need to know which wires to put where . And also if I can just
    take and turn around signals on one end , like rts > cts .
                                   
    	anybody else done this  ?
    
    						thanks,
     						randy
T.RTitleUserPersonal
Name		DateLines
279.1Null Modem Unit + SolderNZO75A::WONGToday began in New Zealand (NZO)Fri Aug 01 1986 12:5619
    Main requirement is to get a clocking signal.
    
    Get one of those Null Modem units (don't have the part number at
    my finger tips) but FS usually have them on hand.
    
    Open it up and solder a link between pins 15 & 17 both sides to
    pin 24 on one side.
    
    This uses the DMF-32 maintenance clock to provide the clocking signals.
    
    Connect each synch port to the null modem using a standard modem
    cable - BC004
    
    Works a treat.
    
    	/Owen

    
    (PS Mr Moderator - node database is out of date, NZO75A is now NZOV01)
279.2No null modem or cable availableBAXTA::MACKAY_RANDYFri Aug 01 1986 13:137
    
    	How about doing it without a null modem , I don't have easy
    access to the cables or the null modem . 
    	But I can build a cable .........
    			
    						randy
279.3Here's the connectionsSWIFT::ILESMike Iles - UK Country SupportMon Aug 04 1986 10:0049
    
    There is a standard cable recommended for this (no other parts
    necessary) which is a BC17-D
    
    The connections in this are:-
    
       P1                                P2
    
    	1---------------------------------1
    
    	2---------------------------------3
    
    	3---------------------------------2
    
    	4---------------------------------8
           |
    	5--/
            
    	6---------------------------------20
           |
       22--/	
            
    	7---------------------------------7
    
    	8---------------------------------4
                                       |
                                       \--5
    
       15---------------------------------17
           |
       24--/
          
       17---------------------------------15	
                                       |
                                       \--24
    
       20---------------------------------6	
                                       |
                                       \--22
                                            
    The cable used has individual screens for the wires carrying the
    clock signal.
    
    Remember too that there is no mechanism provided for changing the
    baud rate of the internal clock, aside from hacking the DMF32 directly
    but I believe it is set up by DECNET to 9.6k
    
    -Mike-