Racal Instruments 1256 Manual page 146

Publication No. 980855 Rev. A
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Maximum value:
Figures 7-1 (A-D)
DIG:SYNC:DATA command and the DIG:SYNC:INDEX command.
After power-on, or a *RST command, no data is loaded into any
output port buffer of a 1260-114. The index for each port points to
the first location in the buffer.
After executing the command:
DIG:SYNC:DATA (@7(4)),10,20,30,40
the memory buffer for port 4 of module 7 is filled with data as
depicted in Figure 7-1 (A). There are four bytes loaded. The index
for this port points to the next available position in the port buffer,
shown as location 4 in the figure.
After executing the command:
DIG:SYNC:DATA (@7(4)),50,60,70,80,90
the memory buffer for port 4 of module 7 tracks that depicted in
Figure 7-1 (B). There are now a total of nine bytes loaded. The
index for this port now points to the next available position in the
buffer.
After executing the command:
DIG:SYNC:INDEX (@7(4)),3
the index for the port buffer now points to the fourth entry in the
buffer. This is where the next data will be loaded. This is depicted
in Figure 7-1 (C).
After executing the command:
DIG:SYNC:DATA (@7(4)),77,78
the fourth and fifth data bytes are overwritten. The previous data
(40 and 50) is replaced by the new data (77 and 78). The index
now points to the sixth entry, which has a value of 60. The next
DIG:SYNC:DATA command would begin by overwriting this data.
This final configuration is depicted in Figure 7-1 (D).
1256 User Manual
255, but less than, or equal to, the
number of data points loaded
show the interaction
Digital Module Operation 7-9
between the