Scan - HP E1346A User Manual

Comments
Example

SCAN

Parameters
Comments
Example
Chapter 5
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•
Query is Software Readback: The [ROUTe:]OPEN? command
returns the current software state of the channel specified. It does
not account for relay hardware failures.
Query Multiplexer Channel Open State
OPEN (@100,247)
OPEN? (@247)
[ROUTe:]SCAN <channel_list> defines the channels to be scanned. The
channel_list is in the form (@ccnn), (@ccnn,ccnn), or (@ccnn:ccnn)
where
cc = card number (00-99) and nn = channel number (00-47).
Parameter Name Parameter Type
channel_list
numeric
< >
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Defining the Channel List: When executing [ROUTe:]SCAN, the
channel list is checked for valid card and channel numbers. An error
is generated for an invalid channel list.
•
Scanning Operation: With a valid channel list,
INITiate[:IMMediate] starts the scanning cycle and closes the first
channel in the channel list. Successive triggers from the source
specified by TRIGger:SOURce advances the scan through the
channel list.
•
Stopping Scan: See the ABORt command.
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Closing the DT Tree Switch: See the
[ROUTe:]SCAN:MODE RES command.
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Related Commands: TRIGger, TRIGger:SOURce.
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*RST Condition: All channels open.
Scanning Using External Devices
The following example shows how to scan channels using the HP
E1300/E1301 Mainframe via HP-IB and an HP 3457A Digital Multimeter.
This example uses the mainframe "Trig Out" port to synchronize the
multiplexer module in a switchbox to the multimeter. The trigger pulse
form the port triggers the multimeter for a measurement. See chapter 3 for
typical user connections to the multiplexer.
The computer used in the example is an HP Series 200/300 with HP BASIC
as the program language. The computer interfaces with the mainframe over
HP-IB. Assumed is an HP-IB select code of 7, an HP-IB primary address of
09 and 22 for the HP E1300/E1301 Mainframe and HP 3457A Multimeter,
respectively, and an HP-IB secondary address of 14 for the switchbox.
10 OUTPUT 722;"TRIG EXT;DCV"
20 OUTPUT 70914;"OUTP ON"
HP E1346A Multiplexer Command Reference 51
100 opens channel 00 of
multiplexer #1; 247 opens channel
47 of multiplexer #2
Query channel 247
Range of Values
cc00 - cc47
Sets multimeter to external trigger
and to measure dc volts
Enables "Trig Out" port