HP 1650B Programming Reference Manual page 83

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HP 1650B/HP 1651B
Programming Reference
The preamble (bytes 17 through 176) consists of the following 160 bytes:
2 bytes - Instrument ID (always 1650 for both the HP 1650B and
HP 1651B)
2
bytes - Revision Code
The values stored in the preamble represent the captured data currently
stored in this structure and not what the current configuration of the
STATE with tagging, while the current setup of the analyzer is TIMING.
The next 78 bytes are for Analyzer 1 Data Information.
1 byte - Machine data mode, one of the following values:
0 = off
1 = state data (with either time or state tags)
2 = state data (without tags)
3 = glitch timing data
4 = transitional timing data
1 byte - List of pods in this analyzer, where a 1 indicates that the
corresponding pod is assigned to this analyzer.
bit 7 bit 6
unused unused Pod 1
1 byte - Master chip in this analyzer - When several chips are grouped
together in a single analyzer, one chip is designated as a master chip. This
byte identifies the master chip. A value of 4 represents POD 1,3 for POD
1 byte - Reserved
bit 5 bit 4 bit 3
Pod 2 Pod 3 Pod 4
System Commands
DATA
bit 2 bit 1
Pod 5 unused
6 9