April 25, 2012

RS-232 full voltage range

When it comes to RS-232 electrical characteristics, there is one important thing to note: the voltage range for signalling in RS-232 is very wide, from 3 to 15 volts, plus or minus. The implication is that designers of serial port boards, such as LAVA, have wide latitude for electrical design, according to the specification. In reality, if a board designer takes the minimal approach, their users might run into disappointment. Let me explain. All LAVA PCIe serial ports are engineered […]
April 25, 2012

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 Raspberry Pi as an example, we have a device that has a UART, but note: having a UART is not the same as having an […]
April 24, 2012

New! Dual serial full-height PCIe card

We’ve just launched a new version of our DSerial-PCIe. This version is the DSerial-PCIe/LP (our low profile PCIe card), but fitted with a full-height bracket. The advantage is that the fan-out cable used on the low-profile version is now available on a full-height PCIe card. For those wanting the flexibility of a cabled solution for PCIe expansion, this card fits the bill. DSerial-PCIe/LP FHB The features of this new card include: • Form factor: 1x. Will fit into any PCIe […]
April 23, 2012

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 those intending to use the Raspberry Pi as an embedded SBC more serial ports might be desirable. In that case, they could be added using […]
April 11, 2012

Weather stations on the Internet

From backyard weather stations to nation-wide integrated systems, the Internet has transformed the collection, analysis, and distribution of weather information. By their nature, weather stations are geographically scattered, and yet there is great value in consolidating the information that they collect. For this reason, many weather stations have the capability of outputting thier data to a computer system or modem. LAVA Ether-Serial Links can play a role in either eliminating the need for a computer near the weather station, or […]
April 5, 2012

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 the portable RFID readers, allowing charging and downloading information collected throughout the stores of a large retail chain. Once downloaded, the data was passed over […]
April 5, 2012

Car Wash 5 Port Embedded Serial Device Server

Innovative Control Systems had a requirement for serial port control of a number of systems in a chain of automated car washes. In this setting, moisture and heat were unavoidable, and the device had to be fitted into an existing climate-proof enclosure. LAVA developed a spin of hardware to meet this need, producing a five-port Ether-Serial Link with a form factor suitable to the customer’s needs. On the firmware level, this product is virtually the same as our four-port serial […]
April 5, 2012

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 them to pipe DOS commands over Ethernet, eliminate costly signal amplifiers, and convert serial port settings between devices (such as converting 7-bit serial to 8-bit […]