Hameg Instruments HM8012 Manual página 32

R e m o t e c o n t r o l
For these commands, there is no error recovery
provided for because it is normally possible to
put the instrument in one of these states at any
time.
Mode commands
Mode commands correspond to the "MODE" key
on the front panel.
DC<CR> switches the instrument to the
DC measuring mode.
AC<CR> switches the instrument to the
AC measuring mode.
AD<CR> switches the instrument to the
AC + DC measuring mode.
BY<CR> activates the continuity test beep.
BN<CR> deactivates the continuity test beep.
If the requested mode is not compatible with the
current function (e.g.: sending the AC command
while the instrument is measuring resistances),
the instrument will indicate this by a beep in the
same way as for the front panel control. In
addition, the control error indicator is set (see
command E?).
Range modification commands
These correspond to the "RANGE" keys on the
front panel.
AY<CR> switches to automatic range change
AN<CR> switches to manual range change
R+ <CR> switches to the next higher range
R– <CR> switches to the next lower range.
If it is impossible to activate or deactivate the
autoranging the current function (e.g. following
the AM command to switch to current mea-
surement the AY command cannot be executed
since the measurement is made in a single range
for this function) or if it is impossible to change
ranges, the instrument will send a beep. In
addition, the command error indicator is then set
(see command E?).
Display type commands
These correspond to the choice of the HOLD OFF-
SET key on the front panel.
HD<CR> switches the instrument to HOLD
O1 <CR> switches the instrument to OFFSET
(Single)
32
Subject to change without notice
O0<CR> switches the instrument to NORMAL
L0<CR> locks the front panel. In this case,
pressing a front panel key will cause
the "rtEOn" message to appear.
L1<CR> is a way of unlocking the front panel.
The NORMAL type corresponds to a display with-
out a reference (OFFSET) and without maintaining
(HOLD) the front panel state. In the same way as
for the manual control, it is impossible to switch
to the OFFSET mode without first going to the
HOLD mode. Indeed, the maintained measure-
ment is used as a reference.
The possible steps are therefore:
NORMAL (HD) → HOLD (O1) → OFFSET (HD) →
OFFSET + HOLD (O0) → NORMAL
Unlike the manual command, it is possible to
return directly to the NORMAL mode at any time
during command O0.
Status commands
The status commands are used for recovering
the status of the instrument. The returned infor-
mation consists of ASCII character strings, each
terminating in a <CR>.
I? <CR> Request for equipment identification
which returns:
HAMEG, HM8012,,V1.03<CR>
I.e.: manufacturer, instrument
reference, void and software version
(Firmware).
F? <CR> Requests current measurement
function. The instrument returns one
of the following strings:
VOLT<CR>
AMP<CR>
MAMP<CR>
OHM<CR>
DIODE<CR>
TDGC<CR>
TDGF<CR>
DB<CR>
M? <CR> Requests current measurement mode.
The instrument returns one the eight
following strings:
AC BEEP-ON <CR>
AC BEEP-OFF <CR>
DC BEEP-ON <CR>