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OPEN? [ROUTe:]OPEN? <channel_list> returns the current state of the channel(s)
queried. The channel_list is in the form (@ccnn). The command returns 1
if the channel is open or returns 0 if the channel is closed.
Comments • Query is Software Readback: The [ROUTe:]OPEN? command
returns the current software state of the channels specified. It does
not account for relay hardware failures. A maximum of 127
channels at a time can be queried for a multi-module switchbox.
Example Query Channel Open State
This example opens channels 100 and 202 of a two-module switchbox (card
numbers 01 and 02) and queries channel state. Since the channels are
programmed to be open 1,1 is returned.
OPEN (@100,202) 100 opens channel 00 of card #1;
202 opens channel 02 of card #2.
OPEN? (@202) Query channel 02 of card #2.
SCAN [ROUTe:]SCAN <channel_list> defines the channels to be scanned. The
channel_list is in the form (@ccnn) where cc = card number (00-99) and nn
= channel number (00-04).
Parameters
Parameter Name Parameter Type Range of Values Default Value
channel_list
numeric cc00 - cc04 N/A
Comments • Defining the Scan 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 Channels: To scan:
– a single channel, use [ROUTe:]SCAN (@ccnn);
– for multiple channels, use [ROUTe:]SCAN (@ccnn,ccnn,…);
– sequential channels, use [ROUTe:]SCAN (@ccnn:ccnn);
– a group of sequential channels, use
[ROUTe:]SCAN (@ccnn:ccnn,ccnn:ccnn);
– or any combination.
• 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.
• Related Commands: TRIGger, TRIGger:SOURce
• *RST Condition: All channels open.
Example Scanning Using External Device
See the section in Chapter 3 titled “Scanning Channels” for examples of
scanning programs using external instruments.
60 HP E1368A/69A/70A Command Reference Chapter 4