Provides printer spooler services. Manages an uninterruptible power supply connected to the computer. Provides network connections and communications. Some start at boot, some are automatic, and some are manual. A few are disabled. You might be wondering why. In Windows NT, tons of devices device drivers for hardware and services useful software for the operating system are registered in the OS, whether you ever use them or not.
But which drivers drive which hardware, and what do those services do? Vague driver and service names One thing that interferes with troubleshooting Windows NT is the vague naming convention for many devices and services.
For example, Sparrow. For your reference, here are a couple of tables giving the names and purposes of the drivers that ship with Windows NT Table 1 and the default services used by the OS Table 2. Remember to be careful when you work with devices and services. Beware of disabling services that depend on other services, as noted below. The default services list is available in the NT 4. If you ever need them locally, press Start Help, and type default services in the index to view the topic.
Happy troubleshooting! Table 1: Windows NT 4. Computer Browser Maintains a list of computers on the network. Directory Replicator Replicates directories and files between computers. Event Log Records system, security, and application alerts into the logs you see in Event Viewer.
Messenger Sends and receives messages sent by administrators or the Alerter service. Net Logon Used to authenticate a workstation on a domain, or by an NT server to synchronize the domain database with the domain controller.
Schedule Enables the console AT command, used to schedule commands and programs to be run. Server Provides RPC support, file, printer, and named pipe sharing. Spooler Provides printer spooler services. UPS Manages an uninterruptible power supply connected to the computer. Workstation Provides network connections and communications. Editor's Picks. The topic identifies a file or node name. In the case of file-based DDE server applications such as Microsoft Excel, the topic is typically a file name with a.
XLS extension, i. This register specifies the element in the DDE server application that contains the data. In the case of an Excel file, the item is the spreadsheet cell identifier, which is a row number and a column number. For example, B5 is entered as r5c2 for row 5, column 2. This Numeric register contains the value read from the DDE server. It will automatically be updated each time the server issues a new value. This Boolean output register shows the status of the DDE link. This register shows the not available value if one of the setup registers is blank.
All events are recorded in the Event register. Possible events and their associated priority numbers are: Event priority group Priority Description Setup Change 10 Input links, setup registers or labels have changed. The Event output register stores the following information for each ION event: time stamp, priority, cause, effect, and any values or conditions associated with the cause and effect.
The following table summarizes how the DDE Input module behaves under different conditions. Condition Response of output registers After the module is re-linked or its setup registers are changed The Value output register is not available. The Status output register shows the current status of the DDE link. When the device is started or powered-up either the first time, or after a shut-down The Value output register is not available.
Once you have specified the setup register values, and the DDE server is successfully linked, the data identified in the Item setup register should appear in the Value output register. For the server to link successfully, the server must be in the location specified. If the module senses that the link with the DDE server is broken, it automatically runs a routine to reconnect as soon as the server is available.
If your DDE server does not update the register, you may have to go to the DDE application and enter a new number for the Value register to access, or set the application to automatically update links. A DDE link transfers data in textual exchange format, meaning that the DDE Input module receives text and converts the text to a number. A framework that makes use of DDE Input module is shown in the next diagram. To perform a real time cost calculation, you can set up an Arithmetic module to accept a value from an Excel spreadsheet and a meter reading from an IED node.
The tariff structure may include demand and time-of-use penalties. The result is a real time display of actual electricity costs. Show QR code for this page. All other brands may be trademarks of their respective owners. This guide and its content are protected under applicable copyright laws and furnished for informational use only.
0コメント