User's Manual

PMAC User Manual
32 Talking to PMAC
Note:
The Option 9L RS-422 interface is required on a PMAC Lite to tie it to another
PMAC. In this case, the Acc-3D 26-pin serial cable should be used, not the Acc-
3L 10-pin serial cable.
Serial Card Addressing
This software addressing is done by the @n command, where n is a hexadecimal digit from 0 to F (15
decimal). Up to sixteen cards may be chained together under one host. The command addresses all cards
simultaneously, but it is not legal to send a querying command for response over the serial port when the
system is in this mode (which card would respond?).
Setting Up the Addresses
The software address command issued by the host must match the card number of the particular PMAC as
determined by jumpers E40-E43 on PMAC PC, PMAC Lite, PMAC 1.5 STD, and PMAC VME, or by
switches SW1-1 to SW1-4 on PMAC STD. See Table 4-1 for the proper jumper configurations. One
card on the chain must be set up as card @0. It is recommended that the other cards be numbered
sequentially from zero (@1, @2, etc.).
Card Address Control E Points for PMAC PC, Lite, 1.5 STD and VME
E40 E41 E42 E43 Card Address Default
ON ON ON ON @0 @0
OFF ON ON ON @1
ON OFF ON ON @2
OFF OFF ON ON @3
ON ON OFF ON @4
OFF ON OFF ON @5
ON OFF OFF ON @6
OFF OFF OFF ON @7
ON ON ON OFF @8
OFF ON ON OFF @9
ON OFF ON OFF @A
OFF OFF ON OFF @B
ON ON OFF OFF @C
OFF ON OFF OFF @D
ON OFF OFF OFF @E
OFF OFF OFF OFF @F