Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Uživatelský manuál stáhnout pdf (Strana 31)

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, www.campbellsci.com/downloads.

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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Campbell-scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interf Uživatelský manuál Strana 31