Overview; Program Codes; Input Syntax - HP 8642A Operation And Calibration Manual

Model 8642A/B Operation
Overview
Program
Codes
Input
Syntax
..
DATA~NPUT
Data can be input to the Signal Gellerator using either front-panel keystrokes or VIa
HP-IB.
To address the Signal Generator via HP-IB, the input data inforrna tion usually contains
the universal ulllisten 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 llASIC commands.
Table 3-2. Data Inp~lt Example
Input Data
HP BASIC
Set frequency
to
123.4 MHz OUTPUT 719: "FR 123.4 MZ"
Set amplitude to -10 dBm
OUTPUT 719; "AP -10 DM"
Set amplitude increment to 1 0 dB,
OUTPUT 719; "APIS 10 DB APDN APDN"
decrement amplitude 20 dB
Examples assume:
Signal Generator's address
=
19
Refer to your controller manual for command syntax and the controller's address.
The Signal Generator's functions can be accessed with specific program codes. These
pl"Ograrn 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 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 (hey are received and performs the function
specified as soon as a recogniza ble seq uence 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- IE code sequences. (Direct access to
the shift functions is possible from HP-IB so the ::ihift key is not used in HP-IB coding.)
3-11