HP 83751A User Manual page 209

-144
"Character data too long"
The character data element contains more than twelve characters.
(See IEEE 488.2, 7.7.1.4).
"Character data not allowed"
A legal character data element was encountered where prohibited
by the device.
-150 "String data error"
This error, as well as errors -151 through -159, are generated
when parsing a string data element. This particular error message
should be used if the device cannot detect a more specilic error.
-151 "Invalid string data"
A string data element was expected, but was invalid for some
reason. (See IEEE 488.2, 7.7.5.2); for example, an END message
was received before the terminal quote character.
-158 "String data not allowed"
A string data element was encountered but was not allowed by the
device at this point in parsing.
-160 "Block data error"
This error, as well as errors -161 through -169, are generated
when parsing a block data element. This particular error message
should be used if the device cannot detect a more specific error.
-161 "Invalid block data"
A block data element was expected, but was invalid for some
reason. (See IEEE 488.2, 7.7.6.2); for example, an END message
was received before the length was satisfied.
-168
"Block data not allowed"
A legal block data element was encountered but was not allowed
by the device at this point in parsing.
Error Messages
1 6 - 1 1