Network Considerations

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Network Primer

software sends out a broadcast frame that every TCP/IP host and router receives. This frame contains a request for the host with the unknown IP address to return a frame to the ARP requester. This response frame contains the Ethernet address of the sourcing host, and this information is then added to the address correspondence table. All communication with a host can then be done with information from the table.

The operation of ARP also initializes the routing tables in bridges, routers, and gateway devices on the net. These tables are used to determine the section of the network to which a frame should be sent.

Ethernet Adapter Hardware for the PC

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To communicate via the Ethernet network, each PC must be equipped with an Ethernet adapter. There are several types of adapters available (i.e. internal interface boards, Parallel to LAN Adapters (PLAs), and PCMCIA interface cards.) Some PCs are equipped with an Ethernet adapter by the manufacturer, but most adapters must be added after purchase.

Installation of an Ethernet adapter is quite simple. The 264XA-801 card, available as an option to the NetDAQ instruments is supplied with a small software package that investigates the current configuration of the PC and sets the card so there is no interference with other hardware and software. Windows 95 and Windows NT can install commonly used adapters without using the adapter’s installation software.

During the installation of an internal interface board on an ISA bus computer, you must make several detailed configuration decisions. An interrupt line (IRQ) is assigned, port addresses selected, and the network connection type selected. Be sure to record these configuration values because you will need them when installing the network interface software (on Windows 3.1).

During installation of a PCMCIA or PLA interface, few, if any decisions need to be made. These devices make use of already established interfaces to the computer bus.

Drivers

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A driver is the low-level software within the PC that communicates directly with the interface adapter hardware. Drivers cover up the specific nature of the hardware interface and allow the protocol software to be unaware of the type of hardware being used.

Drivers are usually written and supplied by the adapter vendor. Windows 95 and Windows NT supply drivers for commonly used adapters. On Windows 3.1, you may need to install Newt or Trumpet networking software and a driver. The Newt networking software supports two driver standards: ODI and NDIS. The Trumpet network software supports the Packet driver standard.

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Fluke 2640A, 2645A user manual Ethernet Adapter Hardware for the PC, Drivers

2645A, 2640A specifications

The Fluke 2640A and 2645A are advanced bench multimeters that represent a significant leap in measurement technology, designed primarily for electrical engineers and technicians who require precision and reliability in their readings. These multimeters are built to cater to complex applications in manufacturing, research, and development.

One of the standout features of the Fluke 2640A and 2645A is their high accuracy. With specifications that can reach up to 0.0035% DC Voltage accuracy, users can trust that their measurements will be consistent and precise. This is especially critical in fields like automated test equipment (ATE) where exact measurements can be crucial for product quality and safety.

Both models incorporate a large, easy-to-read display, making it convenient for users to view measurement results clearly from a distance. They also feature a wide measurement range, capable of handling a variety of tasks, from basic voltage and current measurements to more complex tasks such as resistance and temperature measurements with appropriate sensors.

The multimeters also stand out with their advanced data logging capabilities. The Fluke 2645A, for instance, can store up to 10,000 readings, allowing for extensive data collection and analysis without the need for constant monitoring. This is beneficial for long-term studies or processes that require continual oversight.

Connectivity is another key characteristic. Both the 2640A and 2645A support USB and RS-232 interfaces, which enable easy integration with computers and other devices for seamless data transfer. This feature is important for engineers who rely on software for data analysis and visualization.

Another notable technology included in these models is the Fluke Connect app compatibility, which allows users to remotely monitor measurements from their smartphones or tablets. This capability provides added flexibility, enabling technicians to work hands-free while still keeping an eye on process measurements.

Additionally, the Fluke 2645A comes with a graphical display option, allowing users to visualize measurement trends over time. This graphical representation can be invaluable for diagnosing issues or observing patterns in data.

In conclusion, the Fluke 2640A and 2645A multimeters offer exceptional performance with their high accuracy, extensive data logging, connectivity options, and advanced visualization capabilities. These features make them indispensable tools for professionals in a variety of fields, ensuring that they can achieve reliable results in their measurement endeavors.