Command Code		Description

ID			Identification command
EP			Enable Even Parity
OP 			Enable Odd Parity	
ZP			Disable Parity	
DF			Set HP 5890 default configuration
E+			Enable echo
E-			Disable echo (default)
H+			Enable host handshake -ENQ/ACK
H-			Disable host handshake (default)
N+			Enable HP 5890 (node) handshake -ENQ/ACK (default)
N-			Disable HP 5890 (node) handshake
RS			Define read sequence (default (none))
TS			Define termination sequence (default (CR/LF))
X+			Enable XON/XOFF protocol
X-			Disable XON/XOFF protocol (default)
AR 			Acquire or release remote control; locks keyboard
AT			read actual temperatures and flows
CA			change all; send a workfile to HP 5890
EV			Read HP 5890 environmental status
IC			read hp 5890 instrument configuration
IF			read hp 5890 instrument fault string
IK 			read last hp 5890 key pressed
LA			list all; receive a workfile from HP 5890
LU			lock or unlock the start key
OT			output text to the hp 5890 display
RF			read Hp 5890 serial interface fault word
RI			read run and readiness information
RK			perform remote keystrokes from the host
RT			retransmit last message sent by the hp 5890
HR			delays start until host is ready
SM			requests that the host be notified when the HP 5890 status is modified
ST			start notification when hp 5890 begins to run
CD 			configure data transfer
CP			configure signal producers
SD			send signal data