126    Sequoia Series 
SYSTem:ERRor? 
This query returns the next error number followed by its corresponding error message string from the 
remote programming error queue. The queue is a FIFO (first-in, first-out) buffer that stores errors as 
they occur. As it is read, each error is removed from the queue. When all errors have been read, the 
query returns 0,No Error. If more errors are accumulated than the queue can hold, the last error in the 
queue is -350,Too Many Errors. 
Query Syntax  SYSTem:ERRor? 
Parameters  None 
Returned Parameters  <NR1>,<SRD> 
Example  SYST:ERR? 
SYSTem:VERSion? 
This query returns the SCPI version number to which the power source complies. The returned value 
is of the form YYYY.V, where YYYY represents the year and V is the revision number for that year. 
Query Syntax  SYSTem:VERSion? 
Parameters  None 
Returned Parameters  <NR2> 
Example  SYST:VERS? 
SYSTem:CHASis? 
This query returns the number of chassis in a system. The value 1 through 4 represent the number of 
chassis in the system 
Query Syntax  SYSTem:CHASis? 
Parameters  None 
Returned Paramters  <NR1> 
Example  SYST:CAHS? 
SYSTem:CMODual[:PRESent]? 1|2|3|4|all 
In Binary mode, the query returns  2x8 bits word represent the modules present for 1U and 2U chassis. 
It returns 4x8 bits in the 4U chassis. The parameter 1 through 6 represent the chassis address or ALL 
to return all chassis in the system. 
Query Syntax  SYSTem:CMOD? 1 
Parameters  1|2|3|4|all 
Returned Paramters  <NR1> 
Example  SYST:CMOD?