American Magnetics 187 Self-Compensating Liquid Level Controller - Manual (Page 51)

40
Remote Interface Reference
System-Related Commands
4.4.2 Device Clear
The Device Clear is a low-level IEEE-488 bus message which you can use
to return the instrument to a responsive state if communication appears to
stall. The status registers and the error queue are left unchanged when a
Device Clear message is received. Device Clear performs the following
actions:
W The Model 187’s serial and IEEE-488 output buffers are cleared.
W The Model 187 is prepared to accept a new command.
Note
For the serial interface, a Device Clear can be initiated by sending
the
< Ctrl-C > (ASCII code 03) character.
4.5 Command Reference
The following paragraphs present all instrument commands and queries
in related groups and a detailed description of the function of each
command or query is provided. Examples are also provided where
appropriate. Return strings may be up to 80 characters in length.
4.5.1 System-Related Commands
W
*IDN?
Return the instrument’s identification string. The identification string
contains the AMI model number and firmware revision code.
W
*RST
Resets the instrument. This is equivalent to cycling the power to the
instrument using the power switch. All non-volatile calibration data and
battery-backed memory is restored. Status is cleared according to the
*PSC setting.
W
*TST?
Performs a self-test. Currently always returns “1” plus a diagnostic code
useful for troubleshooting by an Authorized AMI Technical Support
Representative.
W < Ctrl-C >
Equivalent to sending a Device Clear message over the IEEE-488
interface. <
Ctrl-C > is only accepted from the serial interface. This clears
the output buffers of the instrument and prepares the instrument for a
new command. Status registers are unaffected. <
Ctrl-C > corresponds to
ASCII code 03.