3-2
IM 703753-01E
3.2
Commands
The FB200C/FB200L has various commands and response statuses. By setting the
measurement conditions, appropriate signals can be measured. Statuses can be
received to check the instrument’s conditions.
The transmission and reception of commands and statuses are executed via the RS-422
interface.
The descriptions of the control commands and statuses are given below.
Command Name
Command
Control Description
Continuous
BPR
Starts the measurement, repeats the measurement for the
measurement start
specified average count, and outputs the center wavelength
and peak power. The operation repeats at the specified
interval. The peak power is converted to RBW 0.1 nm.
Single measurement
BPM
Starts the measurement, repeats the measurement for the
specified average count, and outputs the center wavelength
and peak power. The output format is the same as with the
BPR command.
Measurement stop
STO
If the measurement is stopped in the middle of the averaging
operation, the center wavelength and peak power are derived
from the data up to that point. Then, the center wavelength
and peak power are output, and the measurement is stopped.
Set the average count
AVE_nn
nn
:
"01"
to
"99"
Returns
OK:AVE_nn
when the process is complete.
The default value is 1.
Query
AVE?
Returns
AVE_nn
or
AVI_nne
.
Set the average count
AVI_nne
nne
:
"101" to "503"
(100 times or more)
nne="203"
: 20
×
10
3
= 20000 times
Each average operation takes approximately 7 seconds.
The default value is 101 (100 times).
Query
AVI?
Returns
AVInne
or
AVE_nn
.
Zero calibration
ZER
Closes the shutter and performs zero measurement for
each range.
The response time is approximately 13 seconds.
Returns
OK:ZER
when the process is complete.
The dark current default is the data that was measured
before factory shipment.
Set the alarm
ZTH_nnn
Sets the threshold level for the PDA alarm.
threshold level
nnn="050"
: 50nW
The selectable range is from 000 to 999 nW.
Returns
OK:ZTH_nnn
when the process is complete.
The default value is 240 nW.
Set the offset
OFF_nnnn
Sets the wavelength compensation value.
nnnn="
±
012"
:
±
0.12 nm
The selectable range is from –9.99 to +9.99 nm.
Returns OK:OFF_nnnn when the process is complete.
The default value is 0.
Query
OFF?
Returns
OFF_nnnn
.
Set the threshold level
BTH_nnnnn,
Sets the threshold level for detecting the reflection spectrum
nnnnn,nnnnn,
of FBG for each optical power range.
nnnnn
nnnnn="-2234"
: –22.34 dBm
Returns
OK:BTH_nnnnn,nnnnn,nnnnn,nnnnn
when the
process is complete.
The default values and selectable ranges are as follows:
Optical Power
Default
Selectable Range
Range
Value
–5 dBm
–30 dBm
–10.00 to –45.00 dBm
–15 dBm
–40 dBm
–20.00 to –55.00 dBm
–25 dBm
–50 dBm
–30.00 to –65.00 dBm
–35 dBm
–60 dBm
–40.00 to –75.00 dBm
Query
BTH?
Returns
BTH_nnnnn,nnnnn,nnnnn,nnnnn
.
