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1256E User Manual
Introduction
Using ROUTE:
CONFIGURE to
Control Switching
Sequence
Racal Instruments © 2002
ADVANCED SCPI OPERATIONS
The 1256 Switching System offers a number of advanced functions
to give you precise control over the instrument. These functions
can be accessed only via the IEEE-488 (GPIB) and RS-232
interfaces.
The ROUTE:CONFIGURE command controls the sequence in
which relays are opened and closed when more than one relay has
been commanded to change. The command has the form:
ROUTE:CONFIGURE (@<module address>),<seqmode>
The <seqmode> parameter may be one of three modes:
•
IMM (Immediate): Causes channels (relays) to be opened
and closed as quickly as possible. The sequence of opening
and closing is indeterminate. In this mode, care must be
taken to avoid damaging equipment while the relays are in
transition, i.e. by short circuiting power supplies, connecting
high-power outputs together, or applying excessive power to
low-impedance inputs.
•
BBM (Break Before Make): Causes existing channel
closures to be opened before new channel closures are
made. BBM is the default mode on power-up, or after the
1255A has been reset.
•
MBB (Make Before Break): Causes new channel closures
to be made before existing channel closures are opened.
For example, the following command:
ROUTE:CONFIGURE (@4),MBB
causes switch module 4 (the switch plug-in installed in slot 4) to
operate in Make-Before-Break mode.
Chapter 8
Advanced SCPI Operations 8-1
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