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Remote Operation 78
and address the supply to talk. The response will be a numeric value between 0 and 32.
Display On/Off
When the display is on, the commands sent across the GP-IB may experience a slower processing time because the
processor must also spend time to monitor the outputs and update the display. You can shorten your command processing
time by turning off the display. To turn off the display, send the command:
DSP 0
To re-enable the display send the command:
DSP 1
You can also find out the status of the display by sending the following query and addressing the supply to talk:
DSP?
The response will be either a "1’’ or a "0’’.
Message Display Capability. The display command can also be used to display messages on the front panel. Messages
may consist of a maximum of twelve alphanumeric characters. Only upper case alpha characters, numbers, and spaces will
be displayed.
For example, to display the message "OUTPUT 2 OK” send the following command:
DSP "OUTPUT 2 OK"
NOTE The BASIC programming statement for a series 200/300 computer would be as follows:
OUTPUT 705; ''DSP'"'OUTPUT 2 OK""
Other Queries
In the examples discussed above, you saw how to use queries for each function discussed. The following paragraphs
describe other queries which were not previously covered.
ERROR Query. The power supply can detect both programming and hardware errors. You can use either the front panel
(see page 87) or the GP-IB to find out the type of error. Upon detecting an error, the error annunciator on the front panel
and the ERR bit in the serial poll register will be set. When in local mode the supply will display the error name in response
to pressing the ERR key on the front panel. Over the GP-IB, only the error code will be returned. After a query, the error bit
is cleared. A description of these codes is given in Table 5-8. To find out what the error is, send the following query and
address the supply to talk:
ERR?
The supply will respond with an error code number (see Table 5-8).
ID Query. If you want to know the model number of the power supply you are working with, you can send the ID? query
over the GP-IB. To do this send the following over the GP-IB and address the supply to talk.
ID?
The supply will respond with its model number.
Test Query. You can get the power supply to perform a limited self-test at any time during its operation by sending the
TEST? query over the GP-IB. This test does not affect the analog control circuits of the supply and it can be performed
while the outputs are connected to external circuits. For tests of the analog control circuits refer to Chapter 3. Responses to