Article 172115 of comp.os.vms:
I have a Dilog SQ739 so I am not sure if the commands are the same as
your 706, but here it goes:

>>> D/P/L 20088004 80000001    ; setup i/o map
>>> D/P/L 20001F40 20          ; enable mapping
>>> D/P/W 200000DC b0          ; write IP[ to host adaptor (**)
>>> D/P/W 200019DE 3fff        ; write keyword to initiate DMA (***)
>>> S 200

(**) doc said 20001940 but that didn't work, 200000DC worked.
(***)doc said 20001942 but that didn't work, 200019DE worked.

Also the terminal interface is:

     9  7  5  3  1
    10  8  6  4  2
---------------------------board

SQ739 side:  Transmit is 3    goes to 2 on yor terminal
              Receive is 8    goes to 3 on your terminal
                 Gnd  is 2    goes to 7 on your terminal
 7 and 9 should be jumpered.

9600 , 8 N 1. Serial communication begins upon powerup or a qBUS INIT
command.Cable must be removed for proper system operation.

hope this helps.