Operating Manual 1302.6163.12 - 03 9.3
R&S ESU Error Messages
SCPI-Specific Error Messages
9.2 SCPI-Specific Error Messages 
Error code Error text in the case of queue poll
Error explanation
0 No error
This message is output if the error queue does not contain any entries.
Error code Error text in the case of queue poll
Error explanation
-100 Command Error
The command is faulty or invalid.
-101 Invalid Character
The command contains an invalid sign.
Example: A header contains an ampersand, "SENSe&".
-102 Syntax error
The command is invalid.
Example: The command contains block data the instrument does not accept.
-103 Invalid separator
The command contains an invalid sign instead of a separator.
Example: A semicolon is missing after the command.
-104 Data type error
The command contains an invalid value indication.
Example: ON is indicated instead of a numeric value for frequency setting.
-105 GET not allowed
A Group Execute Trigger (GET) is within a command line.
-108 Parameter not allowed
The command contains too many parameters.
Example: Command SENSe:FREQuency:CENTer permits only one frequency 
indication.
-109 Missing parameter
The command contains too few parameters.
Example: The command SENSe:FREQuency:CENTer requires a frequency 
indication.
-110 Command header error
The header of the command is faulty.
-111 Header separator error
The header contains an invalid separator.
Example: the header is not followed by a "White Space", "*ESE255"
-112 Program mnemonic too long
The header contains more than 12 characters.
-113 Undefined header
The header is not defined for the instrument.
Example: *XYZ is undefined for every instrument.