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If the UUT command does not execute the command, refer to step 3 of the "RS-232
UUT Port Setup Procedure" procedure to verify the RS-232 UUT port parameters.
Also check the cable for UUT connection was a modem (not null modem) cable. Be
sure your command was entered correctly and had the correct end-of-line
character(s), if required.
5. In the Main Control Window, select the End GPIB Test command from the Exit
menu.
5-16. Changing between Remote and Local Operation
In addition to local mode (front panel operation) and remote, the 5820A Calibrator can be
placed in a local lockout condition at any time by command of the controller. Combined,
the local, remote, and lockout conditions yield four possible operating states described as
follows.
5-17. Local State
The 5820A Calibrator responds to local and remote commands. This is normal front
panel operation. All remote commands are allowed to execute.
5-18. Local with Lockout State
Local with lockout is identical to local, except the 5820A Calibrator will go into the
remote with lockout state instead of the remote state when it receives a remote command.
5-19. Remote State
When the 5820A Calibrator is placed in remote, either via RS-232 REMOTE command,
or via IEEE-488 asserting the REN line, it enters the remote state. In the remote state, the
Output Display continues to display the output setting or measurement as in local
operation. The Control Display changes to:
f
The left side of the Control Display shows information regarding the present output
function. However, front panel operation is restricted to use of the power switch and the
"Go To Local" softkeys. Pressing either of these softkeys, using RS-232 to send the
command LOCAL, or IEEE-488 to send the GTL (Go To Local) message returns the
5820A Calibrator to the local state.
5-20. Remote with Lockout State
When the 5820A Calibrator is placed in lockout, either via RS-232 LOCKOUT
command, or via the IEEE-488 message LLO, the 5820A front panel controls are totally
locked out. In remote with lockout, the Control Display changes to:
f
The left side of the Control Display shows information regarding the present output
function. However, front panel operation is restricted to use of the power switch. To
f
f
f
f
Changing between Remote and Local Operation
REMOTE CONTROL
Go to Local
f
f
REMOTE CONTROL
LOCAL LOCK OUT
f
f
5
Remote Operation
5-23
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