User manual

H49.0.02.6C-07 User’s Guide GMH 3750 page 11 of 16
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9 Output
The output can be used as serial interface (for USB 3100, USB 3100 N, GRS 3100 or GRS 3105
interface adapters) or as analogue output (0-1V).
If none of both is needed, we suggest to switch the output off, because battery life then is extended.
9.1 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:
 GSOFT3050: Operation and read out of logger function, data display in diagrams and tables
 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™
In addition to the operation at a PC the device can be operated with the GAM3000-device, to use the alarm
function for simple supervision and controlling applications. Just connect a GAM3000 to the interface,
activate the alarm function of the GMH and the relays output is operating.
Supported interface functions:
code
name / function
code
name / function
0
Read nominal values
201
Read max. display range
3
Read system status
202
Read unit of display
6
Read min. values
204
Read decimal point of display
7
Read max values
208
Read channel count
12
Read ID-no
214
Read scale correction
22
Read min. alarm rail
215
Set scale correction
23
Read max. alarm rail
216
Read zero displacement
32
Read configuration flag
Alarm function: 1, Alarm horn: 3
BitLoggerOn: 50, BitCyclicLogger: 51
217
Set zero displacement
222
Read power – off time
223
Set power – off time
102
Set min. alarm rail
224
Logger: read data cyclic logger
103
Set max. alarm rail
225
Logger: read cycle time (LoGG - CYCL)
160
Set configuration flag (see 32)
226
Logger: set cycle time (LoGG - CYCL)
174
Delete min. value
227
Logger: start recording
175
Delete max. value
228
Logger: read # of data
176
Read min. measuring range
229
Logger: read status
177
Read max. measuring range
231
Logger: read stop time
178
Read measuring range unit
233
Read real time clock (CLOC)
179
Read measuring range decimal point
234
Set real time clock (CLOC)
180
Read measuring type
236
Read logger memory size
194
Set display unit
240
Reset
199
Read measuring type in display
254
Read program identification
200
Read min. display range
260
Logger: read data manual logger
Note: The measuring and display range values read via interface are always in the selected display
unit (°C/°F)!