Scan; Setup - Racal Instruments 1260 Series User Manual

SCAN

SETUP

Operation 3-12
SCAN <ON|OFF|CONT>
The SCAN ON command enables the Option 01 to open and close
the channels as specified in the scan list in turn. Each channel is
closed on receipt of a trigger signal from one of the VXIbus
TTLTRG lines or the VXIbus trigger command is received. The
Option 01 will scan the channels until it reaches a break point or
the SCAN OFF command is received. Refer to Section 3.4.16 for
further information on the scan list.
The SCAN CONT command causes the Option 01 to resume
scanning the channels on the scan list after pausing at a break
point in the scan list. The Option 01 will continue to scan until it
reaches a break point on the scan list, or it receives the SCAN
OFF command.
SCAN OFF causes the 1260 Series to stop scanning. Scanning
may only be resumed by the use of the SCAN ON command.
The SCAN command may also be used to recall non-
volatile memory settings in turn.
SETUP <module address>.<seqmode>
This command is used to control the sequence in which switching
modules relays are opened and closed. The sequence modes
(<seqmode>s) are IMM (Immediate), BBM (Break-Before-Make)
and MBB (Make-Before-Break).
The Immediate (IMM) sequence mode will cause the opening and
closing of switching module channels as quickly as possible, and
the sequence of opening and closing is indeterminate. Care must
be taken to avoid damaging connections while the switching
module is in a state of transition, i.e., short circuiting power
supplies to ground, connecting high power outputs together, or
applying excessive power to low impedance inputs.
The Break-Before-Make (BBM) sequence mode causes existing
channel closures to be opened before new channel closures are
made. BBM is the default (power up) state.
The Make-Before-Break (MBB) sequence mode causes new
channel closures to be executed before existing channel closures
are opened.
1260 Series User Manual
NOTE