HP 1650B Programming Reference Manual page 316

Message Communication and System Functions
A-28
response data within a single < response message unit > .
Figure A-28. =z response data separator >
response header, if returned, from the fast or only piece of data.
Figure A-29. c response header separator >
c response message unit separator > . A semicolon delimits the
Figure A-30. c response message unit separator >
C response message terminator > . A <response message terminator >
(NL) terminates a complete c response message > . It should be read
from the instrument along with the response itself.
HP 1650B/HP 16518
Programming Reference