Byte Position
127 26 bytes - Row of data containing the trigger point. This byte group is
organized in the same way as the data rows (starting at byte 101 above).
These binary numbers are base zero numbers which start from the first
sample stored for a specific pod. For example, if bytes 151 and 152
contained a binary number with a decimal equivalent of +1018, the data row
having the trigger is the 1018th data row on pod 1. There are 1018 rows of
pre-trigger data as shown below.
row 0
row 1
.
.
.
row 1017
row 1018 – trigger row
153 24 bytes - Unused
Acquisition Data Description
The acquisition data section consists of a variable number of bytes depending
on which logic analyzer you are using, the acquisition mode and the tag
setting (time, state, or off). The data is grouped in 18-byte rows for the
1660A, in 14-byte rows for the 1661A, in 10-byte rows for the 1662A, and in
6-byte rows for the 1663A.
The number of rows for each pod is stored in byte positions 101 through 126.
The number of bytes in each row can be determined by the value stored in
byte position 20 which contains the number of acquisition chips in the
instrument. For example, if the value in byte position 20 is 4, the instrument
is an 1660A. Values 3, 2, and 1 represent the 1661A, 1662A, and 1663A
respectively.
DATA and SETup Commands
Acquisition Data Description
26–10