Appendix d. al200 settings – Campbell Scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interface User Manual
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Appendix D. AL200 Settings
Operation Mode
The AL200 supports ALERT2 and ALERT-concentration processing. Each process
can service one physical connection on the AL200 at a time. Those connections are
the CS I/O, RS-232, and direct-sensor inputs. The CS I/O port and sensor inputs are
multiplexed, so their use is mutually exclusive.
•
ALERT2 on CS I/O, ALERT Concentration on RS-232
In this mode, the AL200 will accept ALERT2 on the CS I/O port and
ALERT packets on the RS-232 port.
•
Sensor Input Enabled (CS I/O Disabled), ALERT Concentration on
RS-232
In this mode, the AL200 will measure attached sensors and receive serial
ALERT packets on the RS-232 port.
•
ALERT Concentration on CS I/O, ALERT2 on RS-232
In this mode, the AL200 will accept ALERT on the CS I/O port and
ALERT2 on the RS-232 port.
OS Version
The version of the operating system currently running on this device. Updates can be
found on Campbell Scientific’s website
CS I/O SDC Address
Synchronous Device for Communication (SDC) address that this device should use
while communicating over CS I/O. Communication speed (bit rate) is controlled by
the datalogger.
RS-232 Baud Rate
The baud rate used for communication over RS-232.
RS-232 Parity
Parity bit usage during communication over RS-232.
RS-232 Stop Bits
The number of stop bits sent after each character during communication over RS-
232.
Time To Next Slot
Time (seconds) until the next transmission slot.
Station Source Address
ALERT2 station source address. Each station in an ALERT2 network should have a
unique source address.
Destination Address
The source address of device that packets are directed to.
Add Destination Address Controls if Destination Address will be added to the packet header. A setting of
No
will disable the Destination Address settings control.
Frame Length
The total amount of time that all of the stations in the network will report within.
The value is expressed in milliseconds with a resolution of 500 ms. It is an integer
between 500 and 43,200,000 (12 hours). The value must be evenly divisible into 12
hours, that is (43200000 /
Frame Length = Whole Number) or (43200000 MOD
Frame Length = 0).
Slot Length
The maximum amount of time this device can transmit within a single frame. The
value is expressed in milliseconds with a resolution of 500 ms. It is an integer value
between 500 and a maximum of the
Frame Length.
Slot Offset
The offset, from the beginning of the frame, for the transmission slot. The value is
expressed in milliseconds with a resolution of 500 ms. The value cannot exceed
(
Frame Length - 500 ms).
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