User`s guide

Remarks
If ASCii is specified, numeric data is transferred as ASCii characters. The
numbers are separated by commas as specified in IEEE 488.2. The
<length> parameter is optional, but "9" is the default and only allowed
value, and the instrument returns 9 significant digits (for example:
+4.57553816E-05).
If REAL is specified, numeric data is transferred as REAL binary data in
IEEE 488.2 definite-length block format. The <length> parameter is
optional, but "64" is the default and "32" is also valid. The byte order is
controlled by the FORMat:BORDer command.