contains a program editor (EDLOG), a terminal emulator (GraphTerm), telecommunications (TELCOM), a data reduction program (SPLIT), and programs to retrieve data from both generations of Campbell Scientific's Storage Modules (SMREAD and SMCOM).

To participate in the programming examples (Section OV5) you must communicate with the CR10. Read Section OV3.1 if the CR10KD is being used, Section OV3.2 if the PC208 software is being used, or Section 3.3 and Section 5 if some other computer or terminal is being used.

OV3.1 CR10 KEYBOARD/DISPLAY

The SC12 cable (supplied with the CR10KD) is used to connect the Keyboard/Display to the 9 pin Serial I/O port on the CR10.

If the Keyboard/Display is connected to the CR10 prior to being powered up, the "HELLO" message is displayed while the CR10 checks memory. The size of the usable system memory is then displayed (96 for 96K bytes of memory). When the CR10KD is plugged in after the CR10 has powered up, the display is meaningless until "*" is pressed to enter a mode.

OV3.2 USING THE PC208 TERMINALEMULATOR (GRAPHTERM)

For IBM compatible computers, the PC208 software contains a terminal emulator program called GraphTerm. When using GraphTerm, the baud rate, port, and modem types are specified and stored in a file for future use.

The simplest and most common interface is the SC32A Optically Isolated RS232 Interface. The SC32A converts and optically isolates the voltages passing between the CR10 and the external terminal device.

The SC12 Two Peripheral cable which comes with the SC32A is used to connect the serial I/O port of the CR10 to the 9 pin port of the SC32A labeled "Datalogger". Connect the "Terminal/Printer" port of the SC32A to the serial port of the computer with a straight 25 pin cable or, if the computer has a 9 pin serial port, a standard 9 to 25 pin adapter cable.

CR10 OVERVIEW

To establish the communication link between the computer and the CR10, the user may either select the T option and send carriage returns as described above or select the "C" option to "Call" the station (see PC208 Operator's Manual). Once the link is active, issue the "7H" command to enter the Remote Keyboard State.

OV3.3 ASCII TERMINAL OR COMPUTER WITH TERMINAL EMULATOR

Devices which can be used to communicate with the CR10 include standard ASCII terminals and computers programmed to function as a terminal emulator.

OV3.3.1 COMPUTER/TERMINALREQUIREMENTS

The basic requirements are:

1.There must be an asynchronous serial port to transmit and receive characters.

2.Communication protocol must be matched for the two devices.

3.The proper cable/interface must be used between the serial ports.

4.A computer must be programmed to function as a terminal.

While the connection between the computer/terminal and the CR10 may be via modem (phone, RF, or short haul), the most frequently used device for a short connection is the SC32A Optically Isolated RS232 Interface.

Most computer/terminal devices require RS232 input logic levels of -5V for logic low and +5V for logic high. Logic levels from the CR10's serial I/O port are 0V for logic low and +5V for logic high.

The SC32A converts and optically isolates the voltages passing between the CR10 and the external terminal device. The SC32A is configured as Data Communications Equipment (DCE) for direct connection to Data Terminal Equipment (DTE) which includes most computers and terminals.

The SC12 Two Peripheral cable which comes with the SC32A is used to connect the serial I/O port of the CR10 to the 9 pin port of the SC32A labeled "Datalogger". Connect the "Terminal/Printer" port of the SC32A to the serial port of the terminal with a user supplied

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