User`s manual

60 Relay Multiplexer Command Reference
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 channel specified. It does not account for relay
hardware failures.
Example Query Multiplexer Channel Open State
OPEN (@100,215)
100 opens channel 00 of multiplexer #1;
215 opens channel 15 of multiplexer #2.
OPEN? (@215)
Query channel 215.
SCAN
[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 (00–15).
Parameters
Comments • 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.
• Closing the AT, BT, and AT2 Tree Switches:
See the
[ROUTe:]SCAN:PORT ABUS command.
• Related Commands: TRIGger, TRIGger:SOURce
• *RST Condition: All channels open.
Example Scanning Using External Devices
The following example shows how to scan channels using the E1300/E1301
Mainframe via GPIB and an Agilent 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.
Parameter Name Parameter Type Range of Values
<
channel_list>
numeric cc00-cc15