Ad Hoc and Infrastructure Networks

What are Ad Hoc and Infrastructure Networks? LAVA’s wireless serial device servers (WiFi ESLs) can operate in Ad Hoc or Infrastructure modes. These two modes are fundamentally different, each with their own advantages and disadvantages. Ad Hoc Networks The Latin expression “ad hoc” translates into English as “for this,” a translation that loosely suggests what […]

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Connecting DOS emulators with RS-232

Shergroup Textiles runs its DOS-based accounting system “RealWorld” inside an emulator on a SCO Unix server. This accounting package has a virtual serial interface, but no physical serial port exists on the server. Users at Shergroup can access this accounting package through dedicated terminals. One exception exists however: a user on a Windows system, who […]

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RJ-45 Serial: A Tale in Confusion

It’s a common problem we see at LAVA — customers calling up with cabling issues. The most problematic are RJ-45 connectors providing RS-232 interfaces, since there is no solidly standardized pin-out. This issue of RJ-45 to RS-232 connection crops up frequently in POS (Point of Sale) systems, and shows up in other hardware as well. […]

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POS to DVR or NVR Integration: A Serial Splitter – Part 2

We’ve had a number of POS system installers wanting to take output from a POS system to a serial printer, and also send it to a DVR (Digital Video Recorder) or NVR (Network Video Recorder) over an IP connection. Integrating POS and video surveillance is a growing business, and some people are finding it a […]

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Windows 7 certified PCIe drivers

New Microsoft-certified drivers are now available for online download for the range of LAVA PCIe cards: SSerial-PCIe SSerial-PCIe/LP DSerial-PCIe DSerial-PCIe/LP Quattro-PCIe SP-PCIe 2SP-PCIe [9,9] 2SP-PCIe [9,25] Parallel-PCIe Parallel-PCIe/LP These drivers are certified for Windows 7 32-bit and 64-bit.

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OBDII Automotive Diagnostics and serial port connections

Vehicles manufactured after 1996 have a capability that few drivers realize exists: your vehicle has an interface to its computer that can provide a panoply of information about your vehicle’s operation and status, second by second. This interface, the On-Board Diagnostics (OBD) port, gives information on speed, acceleration, fuel use, temperatures (of oil, coolant, air […]

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Parallel-PCI for CAMAC Control

Computer Automated Measurement and Control (CAMAC) is a long-established standard for data acquisition hardware, often used in the nuclear and particle physics fields. The good news about CAMAC systems (when enclosed in a chassis, they are called CAMAC “crates”) is that they seemingly last forever. The bad news is that they are very expensive, often […]

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Raspberry Pi serial port: Ribbon or no ribbon?

The interest in an RS-232 serial port for the Raspberry Pi has LAVA considering making a simple GPIO-to-RS-232 DB-9 serial port board. This little item would plug onto the Raspberry Pi’s GPIO pin header, take the Raspi’s UART signals up to RS-232 levels, and present them on a conventional DB-9 (aka DE-9) connector. It would […]

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RS-232 Serial Crossover Cables

The range of serial cabling includes crossover cables, sometimes called null modem cables. This post fills out the information on crossover cables, as at times confusion about them can cause systems not to work. When two pieces of Data Terminal Equipment (terminals, or DTEs) need to be connected to each other, or two pieces of […]

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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 […]

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