H74.0.05.6C-06
Operating Manual GMH 3651
page 15 of 18
11 Output
The output can be used as serial interface (for GRS3100 or GRS3105 interface adapters) or as analogue
output (0-1V). If none of both is needed, we suggest to switch the output off, battery life then is extended.
11.1 Interface - Base Address ('Adr.')
By using an electrically isolated interface converter USB3100, GRS3100 or GRS3105 (accessory) the device
can be connected to a PC.
With the GRS3105 it is possible to connect up to 5 instruments of the GMH3000 family to a single interface
(please also refer to GRS3105-manual). 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 5).
In order to avoid transmission errors, there are several security checks implemented (e.g. CRC).
The following standard software packages are available for data transfer:
GSOFT3050
:
Operating and evaluation software for instruments with integrated logger function
EBS20M/ -60M
:
20- / 60-channel software to record and display the measuring values
GMHKonfig
:
Software for a comfortable configuration of the device (e.g. freeware)
In case you want to develop your own software we offer a
GMH3000-development package
including
-
an universally applicable 32bit Windows functions library ('GMH3000.DLL') with documentation that can
be used by all 'serious' programming languages.
-
Programming examples for Visual Studio 2010 (C#, C++),
Visual Basic 6.0™, Delphi 1.0™, Testpoint™,
Labview™
The Device has 4 Channels:
- oxygen concentration in mg/l or ppm
- oxygen saturation in percent or partial pressure in hPa or mmHg
- temperature value at the time of recording in °C or °F
- absolute pressure in hPa abs or mmHg abs or depth in m
Supported Interface-functions:
1 2 3 4 Code Name/Function
1 2 3 4 Code Name/Function
x x x x 0
read nominal value
x x x x 199
read measuring type in display
x x x x 3
read system status
x x x x 200
read min. display range
x
12
read ID-no.
x x x x 201
read max. display range
x x x
22
read min alarm limit
x x x x 202
read unit of display
x x x
23
read max alarm limit
x x x x 204
read decimal point of display
x x x x 176
read min measuring range
x
208
read channel count
x x x x 177
read max measuring range
x
222
read turn-off-delay
x x x x 178
read measuring range unit
x
223
Set turn-off-delay
x x x x 179
read measuring range decimal point x
240
Reset
x x x x 180
read measuring type
x
254
read program identification
The measuring and range values read via interface are always in the selected display
unit!
11.2 Analogue Output
– Scaling with DAC.0 and DAC.1
With the DAC.0 and DAC.1 values the output can be rapidly scaled to Your efforts.
Keep in mind not to connect low-resistive loads to the output, otherwise the output value will be wrong and
battery life is decreased. Loads above ca 10kOhm are uncritical.
If the display exceeds the value set by DAC.1, then the device will apply 1V to the output
If the display falls below the value set by DAC.0, then the device will apply 0V to the output
In case of an error (Err.1, Err.2, no sensor, etc.) the device will apply slightly above 1V to the output.
Plug wiring:
GND
The 3
rd
contact has to be left floating!
Only stereo plugs are allowed!
+Uout
