Instructions

H61.0.2X.6C-01 User’s Manual GMH 3161- page 8 of 12
7 Remarks To Special Features
7.1 Sea Level Correction (only for GMH 3161-12 )
The device displays the absolute pressure measured at the sensor. This is not necessarily the same like the
values given by weather stations! The weather stations‘ values are giving the pressure at sea level. Usually
the sensor is placed above sea level and therefore, if the value at sea level(zero) is to be measured, the
pressure loss resulting from the actual level above sea level has to be considered! To correct the measuring
display activate the „Sea-Level-Function“ (SL, p.r.t. chapter 6). Then enter the altitude above sea level of the
sensor‘s location in meters (Alti, p.r.t. chapter 6). When activated, the display shows the SL-arrow and the
device displays the pressure value at sea level.
7.2 Power off Time
If there won’t be pressed any key and no interface communication takes place for the time of the power off
time setting (P.Off), the device will be switched off automatically to save battery power.
If P.oFF = oFF then the automatic switch off is deactivated.
8 Output
8.1 Serial Interface
By means of the serial interface and a suitable electrically isolated interface adapter (USB 3100, USB 3100 N,
GRS 3100 or GRS 3105) the device can be connected to a computer for data transfer.
With the GRS 3105 up to 5 devices of the GMH3xxx- series can be connected to one interface (see also
manual of GRS 3105). As a precondition the base addresses of all devices must not be identical, make sure
to configure the base addresses accordingly (refer menu point “Adr.” in chapter 6).
To avoid transmission errors, there are several security checks implemented e.g. CRC.
The following standard software packages are available:
GMHKonfig: Software for a comfortable editing of the device (e.g. Material selection…)
EBS 20M / 60M: 20-/60-channel software to display the measuring values
In case you want to develop your own software we offer a GMH3000-development package including:
a universally applicable Windows functions library ('GMH3000.DLL') with documentation that can be
used by the most programming languages. Suitable for Windows XP™, Windows Vista™, Windows 7™
Programming examples Visual Basic 4.0, Delphi 1.0™, Testpoint
Note: The measuring and display range values read back from the interface are always in the
selected measurement unit (mbar, bar...)!
Supported functions:
Code
Name/Function
Code
Name/Function
0
Read measurement value
200
Read min display range
3
Read system state
201
Read max display range
6
Read min memory
202
Read display range - unit
7
Read max memory
204
Read display range decimal point
12
Read ID number
208
Read # of channels
32
Read configuration flag
BitCorrectToSealevel:32
(only available at GMH 3161-12)
214
Read scale adjustment [%]
216
Read offset adjustment
220
Read altitude
(only available at GMH 3161-12)
160
Set configuration flag (see above)
221
Set altitude (only available at GMH 3161-12)
174
Clear min memory
222
Read power off time (Conf-P.oFF)
175
Clear max memory
223
Set power off time (Conf-P.oFF)
176
Read min measuring range
240
Reset
177
Read max measuring range
254
Program version
178
Read measuring range measuring unit
179
Read measuring range decimal point
180
Read kind of measuring of sensor
199
Read kind of measuring of display