Network Considerations

I

Notes to Network Administrators

matching network ID. This process is generally referred to as routing the packet, and devices that do this are also referred to as Routers or Gateways.

In many modern networks, the use of subnet masking and the default gateway is not necessary. These networks contain routers and gateways that support the Proxy ARP protocol. In this protocol, the routing path between any two hosts is automatically established by the routers during the ARP process. As a result, the user doesn’t need to manually enter the subnet mask and default gateway information.

When the TCP/IP protocol stack software starts operation, it communicates with an NDIS or ODI driver in a process called Binding. During this process, the stack tells the driver which protocol it is handling. In this way, a driver can direct packets to more than one protocol stack. For example, it is quite common to have the Novell IPX/SPX protocol stack and the TCP/IP protocol stack operating over the same ODI multi-protocol driver.

The protocol.ini file, associated with the NDIS driver and the net.cfg file, associated with the ODI driver, contain driver characteristics and information about each protocol that is operating over the driver.

WINSOCK DLL and Application Programming Interface

I-12.

The NetDAQ Logger software uses the TCP/IP protocol via a set of resources contained in a winsock.dll. This DLL contains a set of functions that support two-way communication between two hosts on the network. Of course, both hosts must support the TCP/IP protocol for a WINSOCK connection to be successful.

WINSOCK isolates the NetDAQ application software from the specific implementation of TCP/IP operating in the PC. WINSOCK's interface to applications has been standardized by a committee of many different PC hardware and software vendors. This makes it possible to operate NetDAQ software over WINSOCK's from several different software vendors.

Windows 95 and Windows NT provide a WINSOCK. You can obtain a Winsock for Windows for Workgroups from Microsoft. On Windows 3.1, you may need to install Newt or Trumpet to get a WINSOCK.

Notes to Network Administrators

I-13.

The NetDAQ product line consists of two instruments, the PC software, and some options. The instruments communicate with the PC using the TCP/IP protocol and the Ethernet physical network. Using proper Gateway devices, the PC could be on almost any physical network that is capable of carrying or tunneling TCP/IP packets and can gate to an Ethernet.

NetDAQ instruments support user entry of the subnet mask and the default gateway. On networks that contain routers and gateways and support the Proxy

I-13

Page 275
Image 275
Fluke 2640A, 2645A user manual Winsock DLL and Application Programming Interface

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.