16.2. Automatic Shut-Off Timer
Select the menu “8/8: Device settings”, submenu “2/6: Shut-off timer” to activate the shut-off
timer and to select between 1, 10 or 30 Minutes. The timer is restarted after pressing a key, i.e.
the instrument only switches off after the selected time if no operation was made.
The shut-off timer is only active in the measuring mode. In the data logger mode it is disabled.
The default shut-off time is 10 minutes.
16.3. Battery Type
For proper function of the battery indicator the correct battery type must be entered. In the menu
“8/8: Device settings”, submenu “3/6: Battery type” you may choose between Alkaline cells and
NiMH accumulators. This setting takes into account the different nominal voltages of both
battery types.
16.4. Factory Settings
The menu “8/8: Device settings”, submenu “4/6: Factory settings” is password protected and
only intended for factory calibration.
16.5. Baud Rate
Select the menu “8/8: Device settings”, submenu “5/6: Baud rate” to choose the baud rate of the
RS-232 interface. Available are 19200, 38400, 57600 and 115200 bits per second. Default value
is 57600. If you have problems with faulty data transmission, e.g. with older PC models,
lowering the baud rate may be helpful.
17. Serial Interface
The connector of the serial (RS-232) interface is located at the front of the instrument. It is a
Binder
711 female socket with 5 pins. It provides the Rx (receive), Tx (transmit) and GND
(ground) signal.
Figure 29: Pin assignment of the serial interface socket (view from outside)
A protective cover makes the socket waterproof (IP65) when not in use.
For connection with the Sub-D9 socket of a PC serial interface the interface cable VM30-H is
supplied with the instrument. For PCs without serial interface a commercially available serial-
to-USB converter can be used which simulates a serial interface on the PC.
18. Signal Output
The VM30-H provides the three AC signals of the accelerometer via a
Binder
711 socket
(4 pins, female) at the front of the case. The AC output is buffered and unfiltered. Depending on
the selected measuring range (Menu 1/8: Gain) the sensor signal will appear at the output either
with -20 dB attenuation or undamped:
44
GND
Tx
Rx