Campbell Scientific CS120A CS120A Visibility Sensor - Page 40

CS120A Visibility Sensor Menu 5: The communication menu CS120A COMMUNICATIONS - MENU 5 ID 0 S/N 1009 (1) Set sensor ID (2) Set RS232/RS485 baud rate:38400 (3) Toggle RS232/RS485 modes:RS232 (9) Refresh (0) Return to main menu -> NOTE The communications menu is used to set baud rates and the mode of operation (RS232/RS485). No change will take effect until you `exit and save'. Menu 9 and 0: Exiting the menu system Options `9' and `0' exit from the menu system. Note that typing `0' will lose all changes made including communications settings. CAMPBELL SCIENTIFIC LTD CS120A menu exited. 15. Calibrating the CS120A The CS120A can be checked and adjusted using the optional CS120A calibrator part number 010816. The calibration must be run using the onboard menu system. If you have Campbell Scientific's Device configuration program a terminal emulation screen is provided in the CS120A screens to let you access this function. To perform the calibration you will need a CS120A calibrator disk and a computer with a standard serial port compatible with the CS120A. If your CS120A is not currently configured for RS232 communications you can set the internal switch, switch three, to temporarily set the sensor to RS232 mode 38400bps. If the sensor is already set in RS232 mode it should not be necessary to change any internal switches. (See Section 10 for more information on the CS120A internal switches.) The test should ideally be performed in the following conditions:  Ambient temperature should be 20ºC +/-10ºC  The local visibility should be approximately 10,000 metres or higher. The system is self-regulating. However, it is recommended that the CS120A is calibrated every two years. 30