Teledyne gfc 7000ta operation manual RS-485 Configuration of COM2, DTE and DCE Communication

Operating Instructions Model GFC7000TA Carbon Dioxide Analyzer

6.11.3. RS-485 Configuration of COM2

As delivered from the factory, COM2 is configured for RS-232 communications. To configure this port for RS-485 communication, please contact the factory. If COM2 is configured for RS-485, the USB com port is no longer enabled.

6.11.4. DTE and DCE Communication

RS-232 was developed for allowing communications between data terminal equipment (DTE) and data communication equipment (DCE). Basic terminals always fall into the DTE category whereas modems are always considered DCE devices. The difference between the two is the pin assignment of the Data Receive and Data Transmit functions. DTE devices receive data on pin 2 and transmit data on pin 3; DCE devices receive data on pin 3 and transmit data on pin 2.

To allow the analyzer to be used with terminals (DTE), modems (DCE) and computers (which can be either), a switch mounted below the serial ports on the rear panel allows the user to switch between the two functions.

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