RS-232 voltages

Recently, while blogging on the Raspberry Pi computer board, I’ve been reminded of the importance of paying attention to serial port voltage levels. While voltage levels are a general consideration for all electronics, I’ll just talk about RS-232 voltage levels, since speaking of voltage levels can be a bit tricky particularly with RS-232. Taking the […]

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More on Raspberry Pi serial ports

This blog posting on the Raspberry Pi serial ports goes into a bit more detail than the last post on Raspberry PI serial interfacing, as it compares the two serial ports the Raspberry Pi has and looks more closely at the characteristics of the second serial port available on the Raspberry Pi. Of course, for […]

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Tyco/ADT TTL Embedded RFID Reader

ADT Business Solutions, a division of Tyco, includes in its retail security products RFID security and inventory systems. They needed serial-to-Ethernet interfacing for one of their portable RFID reader systems. Their specifications were for a compact embedded Ethernet-to-TTL serial module that could be integrated into RFID base stations. These base stations would in turn seat […]

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Serial Device Server Applications White Paper

We’ve just added a new white paper to our collection of technical white papers. This one’s a survey of uses for serial device servers (LAVA’s Ether-Serial Links) that looks beyond the obvious purpose of IP-enabling serial ports to look at other uses for these versatile devices. Additional functionality in Ether-Serial Links makes it possible for […]

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PLC Programming

Serial port connection to PLCs Programmable Logic Controllers (PLCs) are a specialized variety of computer typically used for controlling machinery on assembly lines and other systems needing mechanical and electrical robustness. They provide industrial-grade levels of immunity to electrical noise, precisely deterministic timing, and the ability to operate in a wide range of temperatures. They […]

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PCI & PCIe Riser Cards

In a server room, space is at a premium. As a consequence, the hardware is placed in racks of a standardized width and height, with a standardized spacing between mounting points along the racks’ vertical mounting rails. What has evolved are computers designed with correspondingly specific heights and width/s, to fit this storage and mounting […]

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Raspberry Pi serial interfacing

The Raspberry Pi, the single-board computer that has been causing so much excitement lately, has actually got two serial ports. One is a “mini-uart” with interfacing built into the Raspberry Pi’s GPIO (General Purpose Input-Output) interface. The GPIO interface is a pin header, and the relevant serial port pins are as shown:   The Raspberry […]

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Customized Parallel-PCI

LAVA’s Parallel-PCI card is well-regarded for its speed and compatibility in many systems and applications, but every so often someone needs something special. In the case of Lockheed Martin, as they were developing a system for the US Postal Service they uncovered the need for a parallel port card that delivered a particular output voltage […]

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Parallel Port Control of Plasma Cutter

The parallel port is a crucial part of the control system for plasma cutters, such as those manufactured by PlasmaCAM in Colorado City, Colorado. PlasmaCAM makes a cutting table, automation electronics, and software to control plasma cutters, and they interface their cutters to PCs using parallel ports. There are several reasons why parallel ports are […]

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Engineered by LAVA

Each week at LAVA many ideas are generated in meetings, chance encounters in hallways, and in  talks with customers and suppliers.Some thoughts presented here are completely raw, while others have percolated with us for some time. We call them “LAVA Engineered”. We’d like to share them with you in this blog. Some ideas will turn […]

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