Overview; Data Input; Program Codes; Input Syntax - HP 8642A Operating Manual

Model 8642A/B
Operation
DATA INPUT
Overview Data can be input to the Signal Generator using either front-panel keystrokes or via
HP-IB.
To address the Signal Generator via HP-IB, the input data information usually contains
the universal unlisten command, the Signal Generator's listen address, the controller's talk
address, and a string of HP-IB program codes.
The following Table 3-2, shows some possible Signal Generator settings and corresponding
HP BASIC commands.
Table 3-2. Data Input Example
Input Data
Set frequency to 123.4 MHz
Set amplitude to - 1 0 dBm
Set amplitude increment to 10dB,
decrement amplitude 20 dB
HP BASIC
OUTPUT 719; "FR 123.4 MZ"
OUTPUT 719; "AP - 1 0 DM"
OUTPUT 719; "APIS 10 DB APDN APDN"
Examples assume:
Signal Generator's address = 19
Refer to your controller manual for command syntax and the controller's address.
Program
Codes
The Signal Generator's functions can be accessed with specific program codes. These
program codes are summarized in HP-IB Codes Summary in Table 3-8, Signal Generator
Function to HP-IB Code (page 3-32), and Table 3-9, Signal Generator HP-IB Code to
Function (page 3-33). In addition, most HP-IB codes are printed on the instrument's front
panel, in light gray print, near the code's associated key.
Input
Syntax
Input data information consists of one or more bytes sent over the bus' eight data lines
when the bus' attention control line [ATN] is false, and when the Signal Generator is
remote and addressed to listen with the REN line true (low). The Signal Generator
processes ASCII characters individually as ihey are received and performs the function
specified as soon as a recognizable sequence of characters has been received.
Accessing the Signal Generator's front-panel key functions via HP-IB is equivalent to
accessing them from the front-panel. Table 3-3, on the following page, compares some
local keystroke sequences and their corresponding HP-IB code sequences. (Direct access to
the shift functions is possible from HP-IB so the Shift key is not used in HP-IB coding.)
3-11