Agilent Technologies 8566B Operating And Programming Manual page 185

DL (Continued)
When queried (? or OA), DL returns the display line level as a real number, folowed by carriage-return/line-feed
(ASCII codes 13, 10). The end-or-identify state (EOI) is asserted with line feed. (See DLE.)
7 6 P r o g r a m m i n g