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BYTE 5 shows the status of the TRIGGER, SWEEP, and FREQUENCY modes. Like byte 3, the mode
information is organized by bit groups, and is decoded by using the decimal value of those groups.
This is the bit group organization:
Bits
Mode Information
0-1
TRIGGER MODE
0 = FREE RUN
1 = LINE
2 = EXT
2-4
SWEEP MODE
0 = CONT
1 = SINGLE
2 = MANUAL with Hz resolution (code SM)
3 = not used
4 = MANUAL with STEP resolution (code SN)
5-7
FREQUENCY MODE
0 = START/STOP
1 = CF/AF
2 = CW, with sweep on
3 = CW, with sweep off
BYTE 6 shows the status of miscellaneous modes and functions, which are ON if the appropriate bit is
True (=1), or are OFF if the bit is False.
Bit
Mode or Function
0
AMTD MKR
1
not used (always = 1)
2
not used (always = 1)
3
not used (always = 0)
4
Entry enabled and rotary [KNOB] on
5
SAVE lock enabled
6
ALT mode
7
Keyboard [SHIFT] on
BYTE 7 shows the status of the power and leveling functions. The decimal value of bit group 0-1
indicates the leveling modes, while the remaining bits indicate whether the function is on (=1) or off
(=0).
Bit
Mode or Function
0-1
ALC leveling modes
0 = INT
1 = XTAL
2 = METER
2
not used (always = 0)
3
PWR SWEEP
4
SLOPE
5
RF
6
not used
7
not used
3-74
Operating Information
HP 8340B/41B
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