Remote Operation
Numeric Editing
The Model 1120 allows remote editing of the numeric value of the current output. Sending the
‘W’ character deletes the right-most digit currently on the display, and sending multiple ‘W’
characters removes multiple digits from the right end of the value. These can then be replaced
with numeric characters sent over the interface. This feature allows changing only the last few
digits without having to send the entire value.
The current numeric value is always shown on the Model 1120, and the sign flashes to indicate
that the value is being edited or entered. The Model 1140A supports these operations, but the
output value shown in large characters on the display does not change in real time to show
editing in progress. When editing is completed within one remote packet, only the completed
value is displayed. If remote packets are received that contain editing commands but no
subsequent ‘Z’ or ‘X’ character, the partially edited value is shown just above the large digits in
the middle of the display. This value will continue to be displayed until a ‘Z’ or ‘X’ character is
received, which can aid in debugging the editing process. When a packet containing a ‘Z’ or ‘X’
character is received, the edited value is no longer displayed.
Storage and Recall of Saved Values
Storage and recall of saved values (‘X’ or ‘Y’ character) are not supported. The ‘X’ character is
discarded without error. Any unprocessed edits to the output value are lost when the ‘X’
character is received. The reference-junction temperature cannot be set using the ‘X8’ command
nor can the output be set using the ‘X0’ command.
GPIB Parallel and Serial Poll and Local Lockout
GPIB parallel poll and local lockout are not supported. Serial polling is allowed.
Default Thermocouple Type at Power-up
In the Model 1140A the thermocouple type at power-up is determined by what thermocouple
type was selected when the instrument was powered down. There are no thermocouple modules
in the Model 1140A with which to determine the default thermocouple type.
Meter and Source Modes
Since the Model 1120 only operated in source mode, the Model 1140A only operates in source
mode when the Model 1120 Remote Emulation mode is ENABLED. If this mode is enabled and
the user attempts to change the instrument mode to meter, the following error message will
appear on the screen:
METER MODE NOT ALLOWED
IN 1120 EMULATION MODE
PRESS ANY KEY TO CONTINUE
If the Model 1140A is in the METER mode, and the user ENABLES the Model 1120 Remote
Emulation mode, the Model 1140A will switch to SOURCE mode.
Standby Mode
When the Model 1120 Remote Emulation mode is enabled, standby mode is unavailable.
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