HP 3336A - Page 53

Operation
3-32
Model 3336A/B/C
3-158. Data (Receive). In addition to the information about the instrument encoded into
the Status Byte (see Paragraph 3-142), the following instrument functions may be individual-
ly interrogated and the -hp- 3336 will return the value or state of the function using the Data
message:
—Frequency
—Amplitude
—Phase
—Sweep Start Frequency
—Sweep Stop Frequency
—Sweep Marker Frequency
—Amplitude Blanking On/Off
—Sweep Time
—Output Impedance
—Programming Errors
—Sweep Mode (Log/Linear)
—Amplitude Modulation (On/Off)
—Phase Modulation (On/Off)
—Leveling Loop Speed (Fast/Slow)
3-159. Implementation. The interrogation of an instrument function is a two step process.
That is, the instrument must be sent the Programming Code (IFR for instance) and then the
instrument must be addressed to Talk. At this time the -hp- 3336 will return the data asked
for. The syntax and mnemonics for the controller statements come from the controller
documentation. In the first step, the instrument listen address, which is $ for the -hp- 3336,
and the Instrument Programming Codes come from the instrument documentation. In the
second step, only the instrument Talk address, which is D for the -hp- 3336, comes from the
instrument documentation. The Instrument Programming Codes and their binary, octal,
decimal, and hexadecimal values are presented in Table 3-4.
NOTE
When using Data Transfer Mode 2 (see Paragraph 3-154), the In-
terrogate instruction must be placed at the end of the string of Pro-
gramming Codes or programming errors will occur. Only one in-
terrogating instruction may be sent in each string.
Table 3-3. Instrument Programming Codes—Data Send.
instruction
Interrogation
Frequency
Amplitude
Phase
Sweep Start Frequency
Sweep Stop Frequency
Binary
Code
01001001
01000110
01010010
01001001
01000110
01000110
01001001
01000001
01001101
01001001
01010000
01001000
01001001
01010011
01010100
01001001
01010011
01010000
Decimal
Code
Hexadecimal
Code