Offset Phase Lock and Current Controller Command Set

List of commands for the ICE Offst PHase Lock and Current Controller. Please see Common Laser Controller Command Set for commands relating to the laser controller and Common Commands to all ICE Slave Boards for generic slave board commands.

The theory, usage, and performance of the ICE-CP1 can be found here. The ICE-CP1 web page can be found here.

N

Arguments:

No Arguments Taken

Example:

N  
8

I₂C Command Number: 32

Description

Returns the value of the N divider.

N

Arguments:

[Int] VALUE

Example:

N 16  
16

I₂C Command Number: 33

Description

Set the value of the N divider. Valid settings are 8,16,32 and 64. Returns output from N? command.

Invert

Arguments:

No Arguments Taken

Example:

Invert  
On

I₂C Command Number: 34

Description

Returns whether the error signal is being inverted or not.

Invert

Arguments:

[ASCII] On/Off

Example:

Invert Off  
Off

I₂C Command Number: 35

Description

Turns on or off inverting the error signal. Effectively changes the gain sign of the loop and whether the slave laser will be to the red or blue of the master laser. Returns output of Invert? Command.

IntRef

Arguments:

No Arguments Taken

Example:

IntRef  
Off

I₂C Command Number: 36

Description

Returns if the internal reference oscillator is active (as opposed to using an external reference).

IntRef

Arguments:

[ASCII] On/Off

Example:

IntRef On  
On

I₂C Command Number: 37

Description

Enables or disables using the internal reference (instead of external reference). Returns output of IntRef? command.

IntFreq

Arguments:

No Arguments Taken

Example:

IntFreq  
162.875345

I₂C Command Number: 38

Description

Returns the internal reference’s oscillator’s frequency in MHz.

IntFreq

Arguments:

[Float] FREQ

Example:

IntFreq 204.543765  
204.543765

I₂C Command Number: 39

Description

Sets the internal reference oscillator’s frequency to FREQ, where FREQ is a the frequency in MHz. Returns the output of the IntFreq? command.

Servo

Arguments:

No Arguments Taken

Example:

Servo  
On

I₂C Command Number: 40

Description

Returns the status of the laser servo (on or off).

Servo

Arguments:

[ASCII] On/Off

Example:

Servo On  
Off

I₂C Command Number: 41

Description

Turns on the laser servo (engages the integrator). Returns the output of the command Servo?.

Gain

Arguments:

No Arguments Taken

Example:

Gain  
25

I₂C Command Number: 42

Description

Returns Servo Gain. Range is from 0-64 in steps of 2 dB. 0 is a special gain setting where there is no gain (error signal does not go to integrator).

Gain

Arguments:

[Int] GAIN

Example:

Gain 24  
24

I₂C Command Number: 43

Description

Sets the Servo Gain. Range is from 0-28 in steps of 2 dB. 0 is a special gain setting where there is no gain (error signal does not go to integrator). Returns the output of the command GetGain?

SvOffst

Arguments:

No Arguments Taken

Example:

SvOffst  
2.341

I₂C Command Number: 44

Description

Returns Servo Offset voltage (in volts). When the servo is engaged, this voltage is the starting voltage that the servo integrates from.

SvOffst

Arguments:

[Float] OFFSET

Example:

SvOffst -1.232  
-1.23

I₂C Command Number: 45

Description

Sets the Servo Offset voltage (in volts) to OUTPUT when the servo is turned off. When the servo is engaged, this voltage is the starting voltage that the servo integrates from. Returns the output of the command SvOffst?.

ReadVolt

Arguments:

[Int] CHANNEL

Example:

ReadVolt 4 
4.234

I₂C Command Number: 46

Description

Returns the voltage measured on channel CHANNEL (in volts). The channels refer to:

Servo Out
Error Signal
NA
NA
Laser Current (1V = 1A)
+2.5V Ref
NA
Ground

RampSwp

Arguments:

No Arguments Taken

Example:

RampSwp  
5.72

I₂C Command Number: 47

Description

Reads the sweep range (in volts) for the ramp.

RampSwp

Arguments:

[Float] VOLTAGE

Example:

RampSwp 2.64 
2.65

I₂C Command Number: 48

Description

Writes the sweep range (in volts) for the ramp. Range is from -0V to +10V. Returns the output from the command RampSwp?. The ramp will step from SvOffst - RampSwp/2 to SvOffst + RampSwp/2 by increments determined by RampSwp and RampNum and then return to SvOffst every time a RampRun command is initiated.

Note: RampSwp value is rounded and truncated to match range of the servo offset.

RampNum

Arguments:

No Arguments Taken

Example:

RampNum  
100

I₂C Command Number: 49

Description

Returns the number of data points to be acquired during the ramp. Number of data points is also the number of steps for the ramp.

Note that the amount of bytes stored by the ramp is 2*RampNum. The amount of bytes stored set how much data needs to be read back via the ReadBlk command.

RampNum

Arguments:

[Int] NUMBER

Example:

RampNum 100 
100

I₂C Command Number: 50

Description

Sets the number of data points to be acquired during the ramp. Number of data points is also the number of steps for the ramp.

RampRun

Arguments:

No Arguments Taken

Example:

RampRun  
Busy

I₂C Command Number: 51

Description

Begins ramping the servo output and taking data according to the values set for RampSwp and SvOffst as described above. The Ramp begins at SvOffst - RampSwp/2 and ends of SvOffst + RampSwp/2. When the ramp is completed, the servo output is returned to its starting value of SvOffst. Data can be retrieved with the ReadBlk command. Board will not respond to any new commands while taking data. Returns status of execution of the ramp, either Busy or Finished. Returns fault if ramp is misconfigured. See RampNum? for details. Returns fail if laser is off.

Poles

Arguments:

No Arguments Taken

Example:

Poles  
3 2

I₂C Command Number: 52

Description

Returns two columns of data. First column is a number 1-5 representing the integrator pole value. Values are 3 kHz, 10 kHz, 30 kHz, 100 kHz and 300 kHz. 1 is the slowest integrator (3 kHz), and 5 is the fastest (300 kHz). The second column is a number 0 - 4 representing differential pole value. Values are Off, 10 kHz, 30 kHz, 100 kHz and 300 kHz. 0 is is no differential pole (Off), 1 is the slowest pole setting (10 kHz) and 4 is the fastest pole setting (300 kHz).

Poles

Arguments:

[Int] INTEGRATOR
[Int] DIFFERENTIAL

Example:

Poles 3 2 
12

I₂C Command Number: 53

Description

Sets the integrator and differential pole positions. INTEGRATOR is a value from 1-5 corresponding to 3 kHz (1) up to 300 kHz (5). DIFFERENTIAL is a value from 0-4 with 0 disabling differential, 1 is 10 kHz and 4 is 300 kHz. See Poles? for full list of all pole values.

EvtJump

Arguments:

No Arguments Taken

Example:

EvtJump  
6

I₂C Command Number: 54

Description

Reads the event address for jumping the offset phase lock frequency. Address range is 0-7 where address 0 is no event.

EvtJump

Arguments:

[Int] ADDRESS

Example:

EvtJump 4 
4

I₂C Command Number: 55

Description

Sets the event address for jumping the offset phase lock frequency. Address range is 0-7 where address 0 is no event.

EvtLOff

Arguments:

No Arguments Taken

Example:

EvtLOff  
4

I₂C Command Number: 56

Description

Reads the event address for turning the laser off. Address range is 0-7 where address 0 is no event.

EvtLOff

Arguments:

[Int] ADDRESS

Example:

EvtLOff 2 
2

I₂C Command Number: 57

Description

Sets the event address for turning the laser off. Address range is 0-7 where address 0 is no event.

EvtData

Arguments:

[Int] ROW
[Int] COLUMN
[Float] VALUE

Example:

EvtData 4 3 203.324 
Success

I₂C Command Number: 58

Description

This function only works as described with firmware 2.3 and higher. If using an older firmware, please upgrade to the latest firmware before using this function.

Loads data into the event system for jumping the offset phase lock frequency when a jump frequency event is received. The ROW sets when this frequency jump will be engaged; ROW=1 means the first event will trigger this jump value. ROW=3 will run on the 3rd event. Events loop back based on the number of event points (set by the EVTNUM command), so if there are 5 event points, then the ROW that is jumped will be sequentially: 1,2,3,4,5,1,2,3,4,5,1….

The COLUMN sets the column of data to be written. Column 0 sets the MODE (see below for explanation). Column 1 sets the reference frequency. Column 2 sets the amount of feedforward to jump the servo output to help the servo quickly acquire lock at the new offset frequency.

The data table for storing the settings looks like the following:

	Columnn 0 (Mode)	Column 1 (Ref. Freq)	Column 2 (FeedForward)
Row 1	3	102.34	0.435
Row 2	5	88.43	-0.23
Row 3	9	105.28	-0.76

The MODE sets the whether to invert the error signal, whether to use the internal or external frequency reference and the N value. Below is a table showing the different modes:

Mode	N	Invert	Internal VCO
0	8	Off	Off
1	8	Off	On
2	8	On	Off
3	8	On	On
4	16	Off	Off
5	16	Off	On
6	16	On	Off
7	16	On	On
8	32	Off	Off
9	32	Off	On
10	32	On	Off
11	32	On	On
12	64	Off	Off
13	64	Off	On
14	64	On	Off
15	64	On	On

The command returns SUCCESS if the data is successfully enter, FAIL if not. Data loaded is saved to memory with the SAVE command.

EvtNum

Arguments:

No Arguments Taken

Example:

EvtNum  
7

I₂C Command Number: 59

Description

Reads the number of offset phase lock values to loop through via the offset phase lock jump event system. Range from 2 - 8. If set to 4, then the sequence of offset phase lock values will be 1,2,3,4,1,2,3,4,1… where the numbers correspond to the ELEMENT NUMBER set when loading data in with the EvtData command.

EvtNum

Arguments:

[Int] NUMBER

Example:

EvtNum 5 
5

I₂C Command Number: 60

Description

Sets the number of offset phase lock values to loop through via the offset phase lock jump event system. Range from 2 - 8. If set to 4, then the sequence of offset phase lock values will be 1,2,3,4,1,2,3,4,1… where the numbers correspond to the ELEMENT NUMBER set when loading data in with the EvtData command.

EvtJRow

Arguments:

No Arguments Taken

Example:

EvtJRow  
3

I₂C Command Number: 61

Description

Return the next row that the will be read from the Event Jump Table when the device gets an event matching the event set with the EvtJUMP command.

EvtData

Arguments:

[Int] ROW
[Int] COLUMN

Example:

EvtData 4 3  
3

I₂C Command Number: 62

Description

Reads back the data in the Jump Table, using the ROW and COLUMN to set what datapoint to read back. See EvtData for more details.

Mode	N	Invert	Internal VCO
0	8	Off	Off
1	8	Off	On
2	8	On	Off
3	8	On	On
4	16	Off	Off
5	16	Off	On
6	16	On	Off
7	16	On	On
8	32	Off	Off
9	32	Off	On
10	32	On	Off
11	32	On	On
12	64	Off	Off
13	64	Off	On
14	64	On	Off
15	64	On	On

Mode	N	Invert	Internal VCO
0	8	Off	Off
1	8	Off	On
2	8	On	Off
3	8	On	On
4	16	Off	Off
5	16	Off	On
6	16	On	Off
7	16	On	On
8	32	Off	Off
9	32	Off	On
10	32	On	Off
11	32	On	On
12	64	Off	Off
13	64	Off	On
14	64	On	Off
15	64	On	On

Mode	N	Invert	Internal VCO
0	8	Off	Off
1	8	Off	On
2	8	On	Off
3	8	On	On
4	16	Off	Off
5	16	Off	On
6	16	On	Off
7	16	On	On
8	32	Off	Off
9	32	Off	On
10	32	On	Off
11	32	On	On
12	64	Off	Off
13	64	Off	On
14	64	On	Off
15	64	On	On