Keysight E4980A User Manual page 255

Overview of Remote Control
Data Buffer Memory
Figure 8-18 Binary format (Buffer memory)
NL^END is not included in the number of bytes to transfer. For example,
the number of byte of ":MEM:DIM DBUF, 3", is (8  4)  3 + 1 = 97 bytes.
Keysight E4980A/AL Precision LCR Meter 255