3502
Optical Chopper System
33
FR*?
Measures a given frequency.
1 =
F
sync
, 2 =
F
outer
, 3 =
OUT 1
, 4 =
OUT 2
.
HAR[ ]?
Sets the harmonic multiplier
H
(1 - 15).
IDN?
Identification query. Returns “NEW FOCUS 3502 CHOPPER
<Firmware version> <Firmware date>, SN<Serial Number>”.
KEY*
Duplicates the action of pressing a front panel key:
0 = Right arrow, 1 = Down arrow, 2 = Up arrow, 3 = Left arrow, 4 = Set,
5 = Measure, 6 = Mode, 7 = Sync, 8 = Wheel.
MEM*
Accesses instrument set-up memory. 0 = Store, 1 = Recall. Use with
STO and RCL commands.
MOD*?
Selects the instrument mode. 0 =
H/S
, 1 =
+/-
, 2 =
NORMAL
.
OSC[ ]?
Sets the internal
synthesizer frequency to three significant digits. (4.00
Hz to 99.9 kHz in
EXT+/EXT-
mode; range automatically limited in
INT
mode).
PHS[ ]?
Sets the phase delay (-180.0 to +179.0).
RCL[ ]?
Selects instrument set-up for recall (0 - 9). 0 - factory default set-up. Use
with MEM1 command.
SET*
Selects the parameter modified by the arrow keys: 0 - Synth frequency,
1 - Phase, 2 - Harmonic multiplier, 3 - Subharmonic divisor, 4 - Recall
set-up, 5 - Store set-up
STO[ ]?
Selects instrument set-up for storage (1-9). Use with MEM command.
SUB[ ]?
Sets subharmonic divide ratio
S
(= 1 - 15).
SYN[ ]?
Selects the source of the sync frequency. 0 =
V
ext
, 1 =
EXT+
, 2 =
EXT-
, 3 =
INT
.
WHL*?
Selects the wheel. 0 = 60 slot wheel, 1 = 42/30 slot wheel, 2 = 7/5 slot
wheel, 3 = 2 slot wheel, 4 = 100 slot wheel.
Table 3: Summary of computer control commands.