HP 8340b - Page 80

Bit 4: RF is unlocked (UNLK appears in the ENTRY DISPLAY). Use OF to determine the source of
the unlocked output. This bit remains latched until this status byte has been read, or until cleared
by the CS or CLEAR 719 commands.
Bit 5: AC line power interruption has occurred since the last Instrument Preset. This bit also
remains latched until read or cleared.
Bit 6: RF is unleveled (use OR to determine present power level). This bit also remains latched
until read or cleared.
Bit 7: FAULT annunciator is on (seen in the ENTRY DISPLAY of the HP 8340B/41B). Use OF to
determine the cause of the fault.
A BASIC example:
10 REM CLEAR (RESET TQ ZERO) BOTH STATUS BYTES
20 OUTPUT 719; "CS"
100 OUTPUT 719; ,, 0 S H
110 ENTER 719 USING "#, B"? SI, S2
120 S = SI
130 FOR K = 1 TO 2
140 PRINT "STATUS BYTE"; K
ISO FOR N = 0 TO 7
160 PRINT"BIT";N;"=";BITS(S,N)
170 NEXT N
180 S = S2
190 NEXT K
Line 110 is a formatted I/O statement, where # suppresses the end-of-line sequence (to avoid
misinterpreting valid data as an EOL sequence), and B indicates that each of the following vari¬
ables (arbitrary variables SI and S2) should be filled with one byte of information. Line 160 deter¬
mines each bit of the status bytes, status byte 1 first (S = SI, N = 0 to 7) then status byte 2 (S —
S2, N = 0 to 7).
Programming codes RM and RE explain how the status bytes can be masked.
RBb Remote knoB, allows the rotary knob of other instruments (computers, network analyzers) to
control the active function of the HP 8340B/41B. The knob is sometimes called an RPG (rotary
pulse generator) or cursor wheel in the manual of other instruments. Here is a demonstration
program for the HP 9826/9836 (926/936) series of computers:
10 REM PRINT TO THE CRT, NOT THE LI NE PR INTER
20 PRINTER IS 1
30 OUTPUT 719; "IP CWI GZ"
40 ON KNOB . 075 GOSUB 60
50 GOTO 50
60 Count = KNOBX
70 PRINT "KNOB COUNT ="; Count
80 OUTPUT 719; "RB" & CHR$ (Count)
90 RETURN
100 END
Line 30 establishes CW as the active function, with an initial value fo 1.0 GHz. ON KNOB in line 40
instructs the computer to detect any rotation of the knob. The computer’s knob generates 120
pulses per revolution; when the first pulse is detected, line 40 starts a sampling-time clock (75
milliseconds in this example) and branches to the subroutine located at line 60.
HP 8340B/41B
Operating Information
3-77