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Ubicom IP2022 Wireless Network Processor. In addition to products that provide a complete generic system for networking, a variety of modules and chips are available to handle specific tasks. Some products can interface to just about any CPU. If you have an existing product or a CPU that you want to use, one of these modules may provide a way to add networking capability. This section describes a selection of products. Lantronix Device Server At a glance: enables any device with an asynchronous serial port to communicate over a network. Typical use: any device or system that communicates over a serial port and requires network access. Ethernet support: 10BASE-T, 100BASE-TX Source: Lantronix, Inc. (www.lantronix.com)
Hardware: Lantronix offers its Device Servers in a variety of packages, including devices in enclosures, circuit boards and chips for incorporating into other devices, and a server squeezed into a slightly extended RJ-45 connector. Each server has a TTL-compatible asynchronous serial port for communicating with an external device or system and an RJ-45 connector for connecting to an Ethernet network. Firmware is stored in Flash ROM. The CPU varies depending on the product. Two of the options are AMD’s AMD186ES and Lantronix’s DSTni-LX, which contains a CPU, serial ports, Ethernet controller, and RAM. Software: The Device Servers contain firmware to support Ethernet and Internet protocols, including UDP, TCP, IP, and HTTP. User firmware manages communications between the serial port and the server. For programming, the DSTni-LX Development kit includes a development board and the Paradigm C++ Professional development toolkit. The USNET TCP/IP software suite and a real-time operating system are also available separately for use in your own hardware. USNET is compatible with Intel 80x86, Motorola 68K, and other microprocessors. Source code is included.
Ubicom IP2022 Wireless Network Processor
At a glance: A CPU optimized for networking with software-configurable peripherals and wireless support. Typical use: Web servers and wireless networking Ethernet support: 10BASE--T Source: Ubicom, Inc. (www.ubicom.com) Hardware. Ubicom’s IP2022 Wireless Network Processor is a CPU optimized for networking functions. The chip contains two configurable Serializer/ Deserializer blocks. Using software modules provided by Ubicom, each block can support Ethernet, USB, a General Purpose Serial Interface (GPSI), a Serial Peripheral Interface (SPI), or a UART. The CPU uses a 120-Megahertz clock obtained from a 4.8-Megahertz crystal. The Universal Device Networking Kit contains a development board, an adapter for in-circuit programming, and software. The Advanced Wireless Kit adds support for IEEE 802.11b wireless networking on a PC Card with supporting firmware. The Phantom Server is a Web server module with an IP2022 CPU, 512 kilobytes of Flash memory for storing Web pages, and support for CGI and SSI. Software. Project development uses Ubicom’s integrated development environment and GNUPro, a software development suite that includes a C compiler. The suite is built around the open-source GNU standard and is available from Red Hat (www.redhat.com). The IP2022’s Core Software Development Kit includes support for Ethernet and Internet protocols.
Netmedia SitePlayer Ethernet Web Server
At a glance: a very inexpensive module that can serve Web pages and perform UDP communications with a minimum of user programming. Requires a serial link to a CPU to update Web page data and receive data from clients. Ethernet support: 10BASE-T Typical use: Basic monitoring and control tasks. Source: Netmedia (.wwwnetmedia.com) Hardware. The main purpose of Netmedia’s SitePlayer(Network article 3-10) is to provide a very low-cost platform for serving Web pages, including pages with dynamic content. For most projects, the SitePlayer communicates with an external CPU over a serial link. The SitePlayer can place data received from the CPU in its Web pages and can send data from a form or a hyperlink on a Web page to the CPU. The CPU can also use the SitePlayer to send and receive UDP datagrams over a network. In some very basic applications, you can use the SitePlayer without a connection to a CPU, such as applications where users click buttons on a Web page to toggle pins on the SitePlayer’s board. The SitePlayer contains just two chips: a Philips 8051-compatible P89C51 microcontroller and a Realtek RTL8019AS Ethernet controller. Two 10-pin headers provide access to the Ethernet interface, an asynchronous serial interface, an output for indicating status of the Ethernet interface, a reset input, and eight I/O pins. The microcontroller’s Flash memory stores the program code that runs the SitePlayer and the Web pages the SitePlayer serves. The SitePlayer can store up to 48 kilobytes of Web pages. The SitePlayer’s development board contains a SitePlayer module and headers for monitoring or connecting to the SitePlayer’s pins.
Also included are an RJ-45 connector for the Ethernet interface, an RS-232 interface and connector for the asynchronous serial interface, a voltage regulator and power-supply connector, an LED controlled by the LINK output, a Reset button, and two additional LEDs and pushbuttons. Software. A SitePlayer project requires a SitePlayer Definition file, which is a text file that contains setup parameters and variable definitions in a Siteplayer-specific format. The setup parameters include information such as whether the SitePlayer should receive its IP address from a DHCP server and if not, what IP address to assign to the SitePlayer. The definitions are for variables that will contain dynamic content in the Web pages. The SitePlayer’s software manual explains the syntax to use in the Definition file. The Web pages served by the SitePlayer are like any Web pages except that they may contain pointers to objects that correspond to variables in the Definition file. A “^” before a name indicates a pointer. For example, ^flow is a pointer to the variable flow. When the SitePlayer serves the Web page, it substitutes the current value of the named variable for the pointer. Netmedia’s SiteLinker utility assembles a Definition file into a SitePlayer Binary image and enables you to load the image and your Web pages into the SitePlayer. A SitePlayer Interface File enables receiving information provided by a user viewing a SitePlayer Web page. The firmware inside the SitePlayer manages communications over the Ethernet and serial ports. The source code isn’t available.
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