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

Test Program #2

Random Data

Message

In this next test program we will format the data sent by the CR1000 to enable the GTX to

include the data messages in its buffer for a random transmission.

First we will send a Random Data message from the CR1000 to the GTX. In our case we

will use the CR1000 Battery Voltage. We will also read the GTX’s Time and Date and set

the CR1000 local clock to the GTX time.

First we must set up the GTX. Using the Microcom GTX Utility software we can set the GTX

up for Random transmission. The Microcom GTX utility runs on a PC and requires a PC

serial port to connect to the GTX serial port. For now, we do this by disconnecting the PC

connection from the CR1000 so that the PC is connected to the GTX serial port (instead

of the CR1000). Once the GTX is set up and enabled, then the GTX serial connection

should be reattached to the CR1000 COM4.

The full use of the GTX utility is beyond the scope of this application note and is not going

to be covered in this application note. The GTX needs to be set to accept Random Data

Tx and it needs to be enabled. A configuration file was saved called ricktestConfigFile.txt

which does this. After opening up the file you also need to ENABLE the GTX.

NOTE

CR1000 programs can be written with commands which include the setup from for the

GTX. For example the rickstestConfigFile.txt contains commands like:

NID=77880016

Which can be sent in the CR1000 by sending “NID=77880016” out the com port

connected to the GTX. A good strategy for code development of the CR1000 GTX

interface is to set up the GTX using the GTX GUI, and then saving off a configuration you

know works, and then writing a setup subroutine for the GTX in the CR1000 CRBASIC code

based on the setup text file.

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uAPP222 (v1.0) July 12, 2005 http://www.microcomdesign.com 7

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Campbell CR1000 Bedienungsanleitung Seite 7