GPT-9000 Series User Manual 
142 
Common Commands 
 
 
*CLS.......................................................................................................... 142 
*IDN ......................................................................................................... 142 
 
The *CLS command clears the internal registers.  
 
Queries the model number, serial number, and 
firmware version of the tester.  
Returns the instrument identification as a 
string in the following format: 
 
GPT-9803, XXXXXXXXXXXX, V1.00 
Model number : GPT-9803 
Serial number :12 character serial number 
Firmware version : V1.00