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BYTE 2 shows the presently active function. Decipher the decimal value of BYTE 2 as follows:
Dec.
Value
Active
Function
Dec.
Value
Active
Function
0
non-numerical function (either SAVE
23
HP-IB address ([SHIFT] [LOCAL])
LOCK, CLEAR LOCK, or ENTRY OFF)
24
not used
1
SAVE in register n
25
ZOOM frequency function
2
RECALL from register n
26
MANUAL sweep
3
ALTernate with register n
27
Frequency offset ([SHIFT] [STOP FREQ])
4
I/O read ([SHIFT] [kHz/msec])
28
Frequency multiplier ([SHIFT] [START FREQ]
5
UNLK indicators ([SHIFT] [EXT])
29
RFSLOPE
6
Power LVL STEP size
7
POWER LEVEL
30
not used
8
SWEEP TIME
31
not used
9
CW RESolution
32
PWR SWEEP
33
not used
10
CW frequency
34
Power meter leveling ([METER])
11
CF center frequency
35
Decoupled ATN/ALC ([SHIFT] [PWR SWP])
12
AF delta frequency
36
Attenuator control ([SHIFT] [SLOPE])
13
START frequency
37
Bypassed ALC ([SHIFT] [METER])
14
STOP frequency
38
not used
15
Marker 1
39
not used
16
Marker 2
17
Marker 3
40
I/O channel ([SHIFT] [GHz/dB(m)])
18
Marker 4
41
I/O subchannel ([SHIFT] [MHz/sec])
19
Marker 5
42
I/O write ([SHIFT] [kHz/msec])
)
43
Sweep time limit (programming code TL)
20
not used
44-245
not used
21
FREQuency STEP size
246
Fault diagnostic ([SHIFT] [MANUAL])
22
Calibration constants accessed
247-256 not used
BYTE 3 shows the presently active and previously active markers. The marker information is coded in
bit groups 0-2 (active marker), 3-5 (previously active marker), and 6-7 (not used); the decimal value of
those bit groups is the marker number. For example:
BIT NUMBER
7
6
5
4
3
2
1
0
BIT PATTERN
XX
10
0
11
is decoded as "active marker is M3 (decimal value of bits 0-2 is 3), and previously active marker is M2
(decimal; value of bits 3-5 is 2)."
BYTE 4 shows the on/off status of the markers and marker functions. If a bit is set True (=1) the
marker or function is on, if the bit is False they are off. This is the bit code:
Bit
Marker or Function
0
MKR SWP
1
Ml
2
M2
3
M3
4
M4
5
M5
6
not used (always = 0)
7
MRK
A
HP 8340B/41B
Operating Information
3-73
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