Data Formats - HP 1630A Operating And Programming Manual

Model 1630A/D/G
Using HP-IB or HP-IL Interface
LEARN STRING COMMANDS
The following learn string commands instruct the analyzer to transmit its internal configuration, state
acquisition data, and/or timing acquisition data to the controller . Learn string commands provide a means of
saving configurations and acquisition data for later use and analysis . Measurement configurations can be
stored and reloaded to repeat complex measurements . Likewise, acquisition data can be returned to the
analyzer for analysis at a more convenient time . You need only transmit the learn string back to the analyzer to
restore configuration or an acquisition . The learn string is transmitted asa receive learn string, that is, nothing
need be added or changed in the learn string in order to return it to the logic analyzer .
Each learn string contains the proper mnemonic header (RS, RT, RA) to receive state or timing data, a binary
byte-count word, the binary data, and two Cyclic Redundancy Check (CRC) bytes. The binary byte-count
word, returned most significant byte (MSB) first and least significant byte (LSB) last, gives the numberof bytes
contained in the binary data file, including the two CRC bytes but not the byte count word or the mnemonic .
Data Formats
Real data is transmitted in one of the following formats. The format type is indicated by abbreviation in the
syntax contents column for each learn string .
(A) - ASCII data
(B) - BCD (binary coded decimal) data
( I ) - Integer data (if multi-byte MSB first, LSB last)
(R) - Real data (in floating point decimal format)
(S) - Switch (Boolean data) O=False,
7-'0
(not 0)=True
(T) - Time Byte 0 Byte 1
(W) - Wide special nine byte internal structure in 1630G.
- Wide special six byte internal structure in 1630A/D.
Date/Time Information
0-1 0-ns
1 -2
1 -us
2-5
2-ms
3-10
4-20
5-50
6-100
7-200
8-500
Each of the learn strings contain month, day and time information . This data is formatted as follows:
Month -
(I) defined using one byte and is an integer value 0 through 11
where 0 = January, 1 = February, etc.
Day -
(B) defined using one byte containing two BCD digits .
Hour -
(B) defined using one byte containing two padded BCD digits .
Minute -
(B) defined using one byte containing two padded BCD digits .
Second-
(B) defined using one byte containing two padded BCD digits .
Year -
(I) defined using two bytes representing one 16 bit integer transmitted as MSB first and LSB
last .
All data that contains more than one byte in the string is transmitted MSB first and LSB last .
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