Publication 1404-UM001D-EN-E - October 2004
8-2 Advanced Features
• Capture number: selects a capture for read-back or returns the
last capture selected. Range 1 to 8 (M6) or 1 to 2 (M8). Default 1.
• Channel number: selects a channel number or returns the last
channel number selected. Range: 1 = V1, 2 = I1, 3 = V2, 4 = I2, 5
= V3, 6 = I3, 7 = I4. Default 1.
• Block number: selects a data block for the next read or returns
the last block selected. Range depends on communications type.
See below. Default 1.
• Read-back mode: selects a read-back mode or returns the last
mode selected. Range 0 to 2, default 0. See below.
• Clear / trigger command: clears one or all captures or triggers a
new capture. Always returns 0. In the M8 model, values of 3
through 8 have same meaning as 0. Options are listed below:
0 - no action
1 - clear capture 1
2 - clear capture 2
3 - clear capture 3 (M6 only)
4 - clear capture 4 (M6 only)
5 - clear capture 5 (M6 only)
6 - clear capture 6 (M6 only)
7 - clear capture 7 (M6 only)
8 - clear capture 8 (M6 only)
9 - clear all captures
10 - initiate a new capture
• Capture type: selects sample rate and data resolution or indicates
selected sample rate and resolution. Range -1 to 5, default 0. -1
disables oscillography. See Table 8.1.
• Pre-trigger: specifies how much of the captured waveform
occurred before the triggering event. Range 0 to 100 per cent,
default 90%.
• Reserved: must be zero (0) on a write, returns 0.
• Capture clear status: Read-only bitfield that indicates which
capture numbers are clear. Bit 0 (LSB) corresponds to capture 1,
bit 1 to capture 2 and so on. For each bit, 1 indicates clear, 0
indicates not clear.
• Capture ready status: read-only bitfield that indicates which
capture numbers contain captures that are ready to read. Same
bit correspondence as above. For each bit, 1 indicates the
capture is ready, 0 indicates no capture or not yet ready. If a
client reads a capture that is not ready, -1 is returned for all data
points.
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