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2. Send abort signal.
A. Write any 8-bit value to the Abort and Arm Immediate register
(base + 41
16
).
3. Re-enable sample triggers.
A. Set bit 7 (base + 4D
16
) to ’0’ to enable sampling for the next
reading (measurement) sequence.
Re-initiating the Digitizer
Initiating the digitizer places the digitizer in the wait-for-arm state. When an
arm is received while in this state, the digitizer moves to the wait-for-trigger
state where it samples when trigger signals are received.
This section describes how the digitizer is re-initiated. A re-initiation is
done following a SCPI CONFigure ... INITiate sequence. Using register
reads and writes, digitizer parameters can be changed and the digitizer
re-initiated at a faster rate than sending another INITiate command. There
are two parts to the re-initiation sequence:
1. initializing digitizer memory
2. initializing and initiating the timebase processor
The re-initiation sequence described in this section is restricted to post-arm
readings only. The other digitizer parameters can be set as required.
Initializing Digitizer
Memory
The registers used to initialize digitizer memory are summarized below.
• memory control register
base + 21
16
• terminal address register
base + 2B
16
• base address registers
base + 2D
16
and base + 2F
16
Initializing digitizer memory involves initializing the memory control
register, setting the ending and beginning addresses in memory where the
data will be stored, and enabling data to be written to memory. For the
complete digitizer re-initiation to occur, the registers must be read and
written to in the sequence covered in the procedure.
378 Register Programming Appendix C