Use the HELP command to list the available commands.
Example
>help
?
ACAL ch0/ch1
ADDR 0...99
AERR err1 err2
AMODE ch1 ch2
ASEL quantity1 quantity2 low1 high1 low2 high2
ATEST value1 value2
CDATE 'cal.date'
CLOSE
CRH
CT
CTA
CTEXT 'cal.info'
ERRS
FCRH
FILT value
FORM 'format string'
HELP
INTV 0...255 s/min/h
L
LI
OPEN addr
PRES bar
PUR on/off
R
RESET
S
SDELAY 0...255
SEND addr
SERI baud p d s
SMODE stop/run/poll
TIME hh:mm:ss
UNIT m/n
VERS
XHEAT on/off
XPRES bar
>