2 – 8
Remote Operation
2.3
Introduction
The SR470 may be remotely programmed via the GPIB interface, the
RS-232 serial interface, or the LAN ethernet interface using a simple
command language documented in this chapter. Any host computer
interfaced to the SR470 can easily control and monitor the operation
of the SR470 .
The SR470 interface configuration is determined by configuration
parameters stored in nonvolatile memory. At power-on the instru-
ment returns to the state it was last in when power was removed.
Exceptions are noted in the command descriptions. These parame-
ters can be changed from the front panel as detailed in
§
1.2.6, or via
the
IFCF
command over a remote interface.
2.4
Commands
This section provides syntax and operational descriptions for remote
commands.
2.4.1
Command syntax
Communications with the SR470 uses ASCII characters. All com-
mands are 4-characters long and are case-insensitive. Standard IEEE-
488.2 defined commands begin with the “
*
” character followed by 3
letters. SR470 specific commands are composed of 4 letters.
The four letter mnemonic (shown in
CAPS
) in each command se-
quence specifies the command. The rest of the sequence consists of
parameters.
Commands may take either
set
or
query
form, depending on
whether the “
?
” character follows the mnemonic.
Set only
com-
mands are listed without the “
?
”,
query only
commands show
the “
?
” after the mnemonic, and
optionally query
commands are
marked with a “
(?)
”.
Parameters shown in
{ }
and [ ] are not always required. Parameters in
{ }
are required to set a value, and are omitted for queries. Parameters
in [ ] are optional in both set and query commands. Parameters
listed without any surrounding characters are always required. A
parameter
i
denotes an integer value. Restrictions limiting the range
of valid values will be noted in the command description.
Do NOT send ( ) or
{ }
or [ ] as part of the command.
The command bu
ff
er is limited to 255 bytes, with 25 byte bu
ff
ers
allocated to each of up to 3 parameters per command. If the command
bu
ff
er overflows, both the input and output bu
ff
ers will be flushed
SR470 Shutter Controller
