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Notes on Scanning
Chapter 2
You can scan a channel or a list of channels using the
tree relays listed in "Table 2-2. Tree Relay Descriptions" on page 39 are
automatically switched when you specify the command
This command is required for the tree relays to function during the scan
through the channel list. The default value is
does not allow these relays to operate and connect channels to the analog
bus.
At power-on or after resetting the module with the
connection to the analog bus is disabled for scan operations. You must
execute the command
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 E1411A/B
multimeter) or through the terminal module "VM Input" and "VMΩI"
terminals.
Note
Scan analog bus connections are disabled at power-on or following a
module reset (
*RST
command to enable tree relay operation (channels 90, 91 and 92) during a
scan operation.
Scanning Requirements of a Switchbox (in an HP mainframe with an HP
command module). To scan modules in a switchbox, you must form a valid
"SWITCHBOX" instrument as described in "Figure 2-2. Channel Switching
to the Analog Bus" on page 40.
Channel List Can Be Extended Across Boundaries. For multiple module
switchbox configurations, the channels to be scanned can extend across
switch modules. For example, for a two module switchbox instrument,
SCAN (@100:263)
Setting Multiple Continuous Scans. Use
from 1 to 32767 scans. Use
scanning.
Tree Relay Switching. Tree relays (channels 90 through 94) are controlled
automatically by the "SWITCH" driver
conjunction with the
"[ROUTe:]SCAN:MODE" on page 79
page 80 for more details).
to enable analog bus tree relay
SCAN:PORT ABUS
command). You must execute the
will scan all channels of both Multiplexer Modules.
ARM:COUNt
INITiate:CONTinuous ON
SCAN
or
SCAN:MODE
SCAN:PORT ABUS
and "[ROUTe:]SCAN:PORT" on
HP E1476A Switchbox Application Examples 47
SCAN
command. The
SCAN:PORTABUS
SCAN:PORT NONE
which
*RST
command,
SCAN:PORT ABUS
<number> to set
to set continuous
command when used in
commands (see
.
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