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Application Note: Microcom GTX Modulator
uAPP222 (v1.0) July 12,2005
Interfacing the MICROCOM DESIGN GTX Satellite Transmitter to the
Campbell Scientific CR1000 Data Logger
Author: Richard Schwarz PRELIMINARY
SUMMARY
The Microcom Model GTX Satellite Transmitter and Data Collector works on GOES, GMS,
ARGOS, SCD & METEOSAT systems. The GTX has some data logger functions built into it,
including an SDI-12 and counter input. The GTX can interface to external data acquisition
systems via its RS-232 port.
Microcom GTX Satellite Transmitter Campbell Scientific Programmable Data Logger
For example, the CR1000 from Campbell Scientific is an external Data logger / Data
Acquisition system which can be interfaced to various sensors to log measurements. The
CR1000 has its own programming language which allows programs to be written for various
application scenarios. By connecting the CR1000 to the Microcom Design GTX Modulator,
programs can be written on the CR1000 and logged measurements can then be forwarded
via the GTX serial port and then sent via GOES, GMS, ARGOS, SCD and METEOSAT satellite
systems.
INTRODUCTION
This Application note goes over basic interfacing of the Microcom GTX Satellite Transmitter
and Campbell Scientific Data Logger. This including hardware connections and sample
software applications, and code snippets. Issues covered include:
1) Interfacing the serial port of the GTX to the CR1000.
2) Programming the CR1000 to handle the serial methodology which the Micrcom GTX
uses for going into and out of sleep (low power) mode. The GTX has a wake up
mode which takes a time period to respond back to a wake up command
(Carriage Return) being sent to the GTX. The GTX responds back with a ‘>’ prompt
which should be used by the CR1000 to send data to the GTX.
3) Setting the internal time of the CR1000 to the more accurate time of the GTX.
4) A possible CR1000 “pass through mode” implementation , such that one serial
connection (from PC) to the CR1000 could be used to talk to both the CR1000 and
the GTX through the CR1000.
User’s of this application note should be familiar with, or have access to basic coding
techniques, user’s manuals and software associated with using the GTX and CR1000,
including:
1) Microcom GTX User’s Manual
2) Microcom GTX GUI Software
3) Campbel Scientific CR1000 User’s Manual
4) Campbell Scientific LoggerNet Software
Throughout this application note, one of the CR1000 serial ports is used to send debug
messages to a terminal screen for verification and testing.
© 2005 Microcom Design Inc. All rights reserved voice: 401.771.1070 Fax:410.771.0018
uAPP222 (v1.0) July 12, 2005 http://www.microcomdesign.com 1
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Inhaltsverzeichnis

Seite 1

Application Note: Microcom GTX Modulator uAPP222 (v1.0) July 12,2005 Interfacing the MICROCOM DESIGN GTX Satellite Transmitter to the Campbell Scie

Seite 2 - GTX - 1.0

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY Units Batt_Volt=Volts ' ''&a

Seite 3 - Figure 3 CR1000

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY SerialOut(Com1,Mess2,"",0,100)

Seite 4 - System Ground 5

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY SerialOut (Com1, CRLF,"",0,100

Seite 5

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY SerialOut (Com4,"RandomData=",&

Seite 6

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY Once the program is written we need to dow

Seite 7

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY We can then go back and see our updated c

Seite 8

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY PASS THROUGH MODE The second serial port (

Seite 9

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY Output can be seen in the following te

Seite 10

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY A subroutine can be developed which can

Seite 11

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY © 2005 Microcom Design Inc. All rights rese

Seite 12 -

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY GTX to CR1000 Connections: Figure 1 is a

Seite 13

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY Figure 3 CR1000 Figure 2 and 3 are dia

Seite 14

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY Figure 3 CR1000 Connections Figure 3 CR

Seite 15

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY CR1000 Programming The first test program

Seite 16

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY SerialOut (

Seite 17

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY Test Program #2 Random Data Message In thi

Seite 18

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY Once all this is done we use the LOGGERN

Seite 19

Interfacing the MICROCOM DESIGN GTX Modulator to the Campbell Scientific CR1000 Data Logger PRELIMINARY The code for our program is shown below c

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