How to Communicate with the Seekat

In this page I will explain the syntax to communicate with the Seekat.

Every command sent to the Seekat should be a string. Every string should start with the operation to execute and end with the character that determines the end of the string, in this case ‘\r’.

Main Syntax:

OPERATION (COMMA) DATA (VARIES WITH THE OPERATION) (END OF STRING)

The Seekat can execute six operations: “*IDN?”, “*RDY?”, “SET”, “GET_DAC”, “RAMP1”, “RAMP2”. When the Seekat does not recognized the operation, it return the string “NOP”, which stands for “No Operation”. Below I will explain each operation:

 

*IDN? and *RDY?

 

IDN? returns the name of the device.

OPERATION STRING (END OF STRING)
*IDN? \r

RDY? returns the string “READY” when the SeekatĀ is ready for a new operation.

OPERATION STRING (END OF STRING)
RDY? \r

 

SET

SET sets a voltage to a channel and returns the channel and the voltage it set.

Example:

OPERATION , CHANNEL , VOLTAGE (END OF STRING)
SET , 5 , 3.6 \r
  • The string above sets the channel 5 to 3.6 volts.

 

GET_DAC

GET_DAC returns the voltage set on an output channel.

Example:

OPERATION , CHANNEL (END OF STRING)
GET_DAC , 5 \r

 

RAMP1

RAMP1 ramps one channel from an initial voltage to a final voltage within an specified number steps and a delay (microseconds) between steps. When the execution finishes, it returns “RAMP_FINISHED”.
Example:

OPERATION , CHANNEL , INITIAL VOLTAGE , FINAL VOLTAGE , # OF STEPS , DELAY (MICROSECONDS) (END OF STRING)
RAMP1 , 2 , -8.5 , 4.8 , 1000 , 30 \r

 

RAMP2

RAMP2 is the same as RAMP1 with the difference that RAMP2 ramps two channels. The # of steps is the total number of steps, not the number of steps per channel. Example:
Example:

OPERATION , CHANNEL 1 , CHANNEL 2 , INITIAL VOLTAGE 1 , INITIAL VOLTAGE 2 , FINAL VOLTAGE 1 , FINAL VOLTAGE 2 , # OF STEPS , DELAY (MICROSECONDS) (END OF STRING)
RAMP2 , 2 , 3 , -8.5 , -5.2 , 4.8 , 7.6 , 1000 , 30 \r

Timeline of the example above:

STEP 1 UPDATES OUTPUT CHANNEL 2 UPDATES OUTPUT CHANNEL 3
DELAY
STEP 2 UPDATES OUTPUT CHANNEL 2 UPDATES OUTPUT CHANNEL 3
DELAY
.. .. ..
STEP 1000 UPDATES OUTPUT CHANNEL 2 UPDATES OUTPUT CHANNEL 3