Agilent Technologies E1476A User Manual page 50

The 75,*JHU 6285FH command specifies the source to advance the scan.
The 2873XW command can be used to enable the E1406 Command
Module's "Trig Out" port, TTL Trigger bus line (0-7) or ECL Trigger bus lines
(0-1).
You can scan a channel or a list of channels using the 6&$1 command.
The tree relays listed in Table 2-2 are automatically switched when you
specify the command 6&$1 3257 $%86. This command is required for the
tree relays to function during the scan through the channel list. The default
value is 6&$1 3257 121( which does not allow these relays to operate
and connect channels to the analog bus.
At power-on or after resetting the module with the 567 command,
connection to the analog bus is disabled for scan operations. You must
execute 6&$1 3257 $%86 to enable analog bus tree relay (channels 90,
91 and 92) operation.
The analog bus provides access to all three wires of the channel (High, Low
and Guard). Access is through the front panel analog bus connector (usually
connected to other multiplexers or to the E1411B multimeter) or through the
terminal module "VM Input" and "VM ΩI" terminals.
NOTE
To scan modules in a switchbox, you must first form a valid "SWITCHBOX"
instrument. See Figure 2-1 for a typical switchbox configuration.
For multiple-module switchbox configurations, channels to be scanned can
extend across switch modules. For example, for a two-module switchbox
instrument, 6&$1 #  scans all channels of both multiplexer
modules.
Use $50 &281W QXPEHU! to set from 1 to 32767 scans. Use
,1,7LDWH &217LQXRXV 21 to set continuous scanning. Tree relays
(channels 90 through 94) are controlled automatically by the "SWITCH"
driver 6&$1 command when used in conjunction with 6&$1 02'( or
6&$1 3257 $%86.
Chapter 2 Switchbox Applications 49
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