HP 27130A Technical Reference Manual page 90

Subfunction 8. Backspace and Other Options
Data block
byte 0
Validation: none
backspace echo
1
=
backspace over-
wri te
2
=
backspace only
handshake timer is for
X-ON/X-OFF or ENQ timer
(1/0, respectively)
reserved
reserved
reserved
strip single text terminators
reserved
4-31
HP27130A