GW Instek GDS-800 Series Programming Manual - Manual (Page 27)

GDS-806/810/820/840 Programming Manual
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Sample Rate : Indicates the corresponding sample rate of received waveform data (4
bytes). The sample rate is indicated by floating point format which compatible with
IEEE 754 standards.
Note: This block uses little-endian byte ordering. See Appendix A for more
conversion information
Channel indicator: Show the channel which sent the waveform data (1 byte).
1 →Channel one 2 →Channel two
Reserved Data: Not used (3 bytes).
Waveform data: Depends on the specify record length, the effective waveform data
which covers 500 points (1000 bytes), 1250 points (2500 bytes), 2500 points (5000
bytes), 5000 points (10000 bytes), 12500 points (25000 bytes), 25000 points
(50000 bytes) , 50000 points (100000 bytes) or 125000 points (250000 bytes).
Each point is composed by two bytes (the integer value of 16 bits). The high byte
(MSD) will be prior transferred.
Example 1
Transfer the waveform data (sample rate = 100MSa/s) of channel 1 at 250000
points record length:
:ACQuire1:MEMory? The oscilloscope will return the following messages:
Note: Please select the specific memory length before implement any acquisition.
See explanation for “:A CQuire:LENGth ” .