GW Instek GDS-2000A series Programming Manual - Manual (Page 263)

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Error messages
Description The following error messages may be returned
from the :SYSTem:ERRor? query. For details see
page 160.
List of error
messages Error number, “Error Description”
+0, "No error."
-100, "Command error"
-101, "Invalid character"
-102, "Syntax error"
-103, "Invalid separator"
-104, "Data type error"
-105, "GET not allowed"
-108, "Parameter not allowed"
-109, "Missing parameter"
-110, "Command header error"
-111, "Header separator error"
-112, "Program mnemonic too long"
-113, "Undefined header"
-114, "Header suffix out of range"
-115, "Unexpected number of parameters"
-120, "Numeric data error"
-121, "Invalid character in number"
-123, "Exponent too large"
-124, "Too many digits"
-128, "Numeric data not allowed"
-130, "Suffix error"
-131, "Invalid suffix"
-134, "Suffix too long"
-138, "Suffix not allowed"