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25.3. Command syntax 
The commands described in this chapter can be issued through both buses (IEEE-488 and RS232). 
All commands listed in this chapter are explained in two columns: 
  KEYWORD and PARAMETERS. 
KEYWORD column includes the name of the command. If a keyword is in brackets ( [ ] ), it is not mandatory. 
Non-mandatory commands are used only to achieve compatibility with language standard SCPI. 
Capitals designate the abbreviated form of the commands; extended form is written in lowercase. 
Command parameters are in brackets (<>); each parameter is separated using a comma. Parameters in 
brackets ( [ ] ) are not mandatory. Line ( | ) means “or” and is used to separate several alternative 
parameters. 
Semicolon ‘;’ is used to separate more commands written on one line.  
E.g. VOLT 2.5; OUTP ON 
Note: 
Each command must end in <cr> or <lf>. Both codes <crlf> can be used at the same time. The calibrator 
performs all commands written on one line of the program after it receives <cr>, <lf> or <crlf> code. Without 
this code, the program line is ignored. 
 
25.3.1. Description of abbreviations 
<DNPD> =  Decimal Numeric Program Data, this format is used to express decimal number with or without 
the exponent. 
<CPD> =  Character Program Data. Usually, it represents a group of alternative character parameters. E.g. 
{ON | OFF | 0 | 1}. 
? =  A flag indicating a request for the value of the parameter specified by the command. No other 
parameter than the question mark can be used. 
(?) =  A flag indicating a request for the parameter specified by the command. This command permits 
a value to be set as well as requested. 
<cr> =  carriage return. ASCII code 13. This code executes the program line. 
<lf> =  line feed. ASCII code 10. This code executes the program line. 
 
 
25.3.2. OUTPut subsystem 
This subsystem allows to control the output terminals of CX 1651 calibrator, to activate the four-wire output 
or to switch the calibrator to x50 current coil (option 130-50). 
Keyword      Parameters 
OUTPut 
  [:STATe] (?)   <CPD> { ON | OFF | 0 | 1 } 
  : ISELection (?)  <CPD> { HIGHi | HI50turn }