Справочник Пользователя для Davis Instruments 7855
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Hardware Installation
•
Standard 4-Conductor Extension Cable — Use one 40’ (12 m) extension
cable (#7876-040) to extend the distance between your station and the
computer. (48’ (14.4 m) maximum)
cable (#7876-040) to extend the distance between your station and the
computer. (48’ (14.4 m) maximum)
Hardware Installation
You can connect a computer directly to your weather station using the
WeatherLink data logger (local connection), or you can connect a computer to
a remote weather station using a phone modem (remote connection).
Requirements and installation for each type of connection differ, and are
explained separately below.
WeatherLink data logger (local connection), or you can connect a computer to
a remote weather station using a phone modem (remote connection).
Requirements and installation for each type of connection differ, and are
explained separately below.
Hardware Requirements
The hardware requirements for local and remote connections are listed below.
Local Connection Hardware Requirements
In addition to the provided hardware, the following are required for a direct
connection.
• Macintosh computer running OS X v10.01 or newer with at least 5 MB of
connection.
• Macintosh computer running OS X v10.01 or newer with at least 5 MB of
free disk space
The amount of space necessary for the data files depends on the archive
interval. Database files containing data stored at a 30 minute archive inter-
val require approximately 36K of disk space per month of data. The file
size changes in a linear fashion depending on the archive interval. For
example, data stored at a 1–minute interval requires approximately 1 MB/
month while the data stored at a 2–hour interval requires approximately
9K/month.
The amount of space necessary for the data files depends on the archive
interval. Database files containing data stored at a 30 minute archive inter-
val require approximately 36K of disk space per month of data. The file
size changes in a linear fashion depending on the archive interval. For
example, data stored at a 1–minute interval requires approximately 1 MB/
month while the data stored at a 2–hour interval requires approximately
9K/month.
• A serial port adapter connected to a Macintosh USB port.
Remote Connection Hardware Requirements
In addition to the provided hardware and the computer equipment listed above,
the following hardware is required for a phone modem connection.
• One external modem to connect to the data logger at the remote site.
• One internal or external modem connected to your Macintosh computer
• Modems must be Hayes
the following hardware is required for a phone modem connection.
• One external modem to connect to the data logger at the remote site.
• One internal or external modem connected to your Macintosh computer
• Modems must be Hayes
®
–compatible and able to send data at 1200 or
2400 baud for use with a Monitor II, Wizard II, or Perception II weather
station.
station.
• Telephone Modem Adapter — The Telephone Modem Adapter is
specially wired to provide the connection between the data logger and the
modem.
modem.
• Use a #7870 adapter with Wizard III, Monitor II, and Perception
stations.