Campbell CS120A, Инструкция по эксплуатации

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Instruction Manual
35
method of setting up a sensor if it was connected to a logger for instance. The
configuration setting commands can be sent via a logger to the sensor removing
the need for a local PC to set up the unit.
The third method is by using the simple menu interface built into the sensor
communicating via RS-232 or RS-485, using a terminal emulator program. This
menu system gives access to the more common settings.
All three of these methods use the sensor’s serial connector B to communicate
with the sensor. This can be via the normal communications cable or a
configuration cable as described in Section 8.1.
12.1 Configuring a PC for talking to the sensor
Described below is the procedure for setting up communications using a terminal
emulator program. The terminal emulators built into many Campbell Scientific
software products can also be used.
The following settings should then be used by default:
Bits per second: 38400
Data bits: 8
Parity: none
Stop bits: 1
Flow control: none
Ensure that if the baud rate of the unit has been adjusted and then the
corresponding bits per second value is entered in the port settings of the terminal
emulator. The sensor should now be ready to accept commands.
It is possible to set the sensor into the default communication state via one of the
internal switches on the sensor main board. See Section 9.
13. Definition of the variables that can be set by the
user on the sensor
Both DevConfig and the command line interface can access all the user
configurable variables within the sensor. The acceptable range and the
identification number for these variables are listed below along with a short
description.
ID Name Range Description Factory
default
1 Sensor ID 0-9 Separate ID used as an extra identifier for a
particular sensor on a network. 0
2 User Alarm 1 Enabled 0-1 User alarm one activation state
0 = Alarm one disabled
1 = Alarm one enabled 0
3 User Alarm 1 Active 0-1 0 = Check if distance is less than ‘User alarm 1
Distance’
1 = Check if distance is
greater than ‘User alarm
1 Distance’
0
4 User Alarm 1 Distance 0-
60000 Distance value that alarm one will trigger against.
This value will correspond to metres or feet
depending upon which is selected in ‘Visibility
Unit’ 10000