HP 8509A Programming Manual page 78

TLS?
TLS:Address{ ? | :<HP-IB Address> }
TLS:Isc{ ? | :<HP-IB card ISC> }
TLS:Power{ ? | :<Power> }
NNNNNNNNNNNNNNNNNNNNNNNNNN
TLS:{ SettlePoint | SettleStart }{ ? | :<Millisec's> }
Not Recommended
8-36 Remote Command Reference