Command Reference; Setting Up The Command Structure; Supported Command And Data Formats - Hameg R&S HM8118 Benutzerhandbuch

Command Reference

10 Command Refe-
rence
The REMOTE/LOCAL key is illuminated if communication
to the instrument has been established via interface (Re-
mote Control). To return to the local operating mode (Local
Control), press the REMOTE/LOCAL key, provided that the
instrument has not been locked out from local operation
via interface (Local lockout). If local operation is locked,
the instrument cannot be operated via front panel keys.
No remote PC software is available for the R&S®HM8118 bridge.
The supported commands can be embedded in any software envi-
ronment that is able to send ASCII characters.

10.1 Setting Up the Command Structure

A syntax with four letters in a command string specifies a
command. The remaining command string consists of pa-
rameters (variables). Multiple parameters in a command
string are separated by a comma. Parameters in brackets
can optionally be used or queried whereas parameters
{ }
that are not in brackets are requested or queried. Com-
mands that can be queried include a question mark in pa-
rentheses following the syntax. Commands that can
(?)
only be queried include a question mark
syntax. Do not send or
( )
variables must be expressed as integers and others as floa-
ting point or exponentially. Normally, the variables
are integers whereas the variable
To prevent communication errors, it is recommended to avoid
command strings. Each remote command ends with CR (carriage
return) or CR+LF (carriage return + line feed) (no individual LF).

10.2 Supported Command and Data Formats

The R&S®HM8118 bridge does not support parallel processing of
commands.
*IDN?
The query *IDN? queries the bridge HM8118 identification
string. The queried string has the following format:
HAMEG Instruments,‹instrument type›,‹serial
number›,‹firmware›
(Example: HAMEG Instruments, HM8118,013206727,1.54).
*RST
The *RST command resets all measuring instrument para-
meters to the bridge factory settings (Reset).
*OPC?
The query *OPC? (= Operation Complete) is used to syn-
chronize the sequence of a measurement. The *OPC?
query returns the value 1 if all measurement values of a
68
? following the
as part of a command. Certain
{ }
is a real number.
x
measurement sequence were completely captured by the
measuring instrument and if the instrument is ready to per-
form another measurement.
*WAI
The *WAI command is a synchronization command that
stops every subsequent command before its execution
until all running measurements are completed. The com-
mands STRT followed by *WAI and XALL? would start a
measurement . However it would block the processing of
further commands until the measurement has been com-
pleted. The XALL? command issues the measurement
result.
*SAV i
The *SAV command saves the current measuring instru-
ment parameters in the memory location. You can select a
memory location between 0 and 9. The measuring instru-
ment always starts with the parameters that are stored in
memory location 0.
*RCL i
The *RCL command activates the stored measuring inst-
rument configuration i and uses it as the current setting.
You can select a memory location between 0 and 9. If the
saved settings (measuring instrument parameters) are in-
complete or have not been saved (e.g. due to an empty
memory location), an error message is displayed when the
command is executed. The *RCL 9 command resets all
measuring instrument parameters to the factory settings.
i and j LOCK 1
The LOCK 1 command allows you to lock the instrument
front panel operation. You can unlock this by pressing the
REMOTE key or by using the LOCK 0 command.
LOCK 0
The LOCK 0 command allows you to unlock an existing in-
strument lock.
$STL(?) {i}
The $STL command sets the trigger delay time (DELAY)
to i milliseconds. The trigger delay time i can be set any-
where between 0ms and 40000ms. The query $STL? que-
ries the set trigger delay time.
AVGM(?) {i}
The AVGM command activates or deactivates the calcula-
tion of the average (AVG). The function AVG Average Va-
lue is activated, several individual measurements will be
used to form a mean value according to the set period.
i=0 deactivates the calculation of the average (NONE), i=2
sets the calculation of the average to MED. The MED (me-
dium) setting is the medium averaging mode. The bridge
HM8118 performs 6 consecutive measurements, rejects
the lowest and highest measurement values and generates
an average based on the four remaining measurements.
This type of averaging hides individual erroneous mea-
surements. If the calculation of the average is set to i=1,