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Serial port modules provide optional opto-isolation

26 Aug 2014

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Diamond Systems, a provider of compact, rugged, embedded computing solutions for real-world applications, has unleashed the Emerald-MM-8EL-XT (EMM-8EL-XT) that the company describes as a family of high performance PCIe/104 OneBankT serial I/O modules offering four or eight serial ports with software-controlled configuration and optional opto-isolation.

The serial ports are based on a high speed PCIe octal UART with 256-byte TX/RX FIFOs and auto RS-485 transmit control. Each serial port can be independently configured for RS-232, RS-422 or RS-485 protocols, along with programmable 120Ω line termination. Each port is independently isolated with an isolated power + signal chip, plus additional isolators for control signals. The board features intelligent power management that limits inrush current on power-up and also enables power-down of unused serial ports for power savings, noted the company.


Opto-isolated models feature independent 2.5kV isolation circuits for enhanced reliability in vehicle or long cable applications. All ports also feature ±15kV ESD protection. Each serial port is available on an independent latching connector for increased isolation and ruggedness. With its wide operating temperature range and high resistance to shock and vibration, the EMM-8EL-XT fits a variety of rugged and on-vehicle embedded serial I/O application needs.

EMM-8EL-XT also offers eight digital/analogue I/O lines that are programmable from the on-board MCU. Each I/O line can be configured for digital input or output. Seven of the I/O lines can also be configured for 12bit A/D input with selectable 0-2.048V or 0-3.3V input ranges.

EMM-8EL-XT contains no configuration jumpers; all configuration and control is done with an onboard MCU. All configuration settings are stored in the MCU's flash memory and are automatically loaded on power-up. The MCU is managed with a comprehensive software suite that makes configuring the EMM-8EL-XT fast and simple. A graphical control panel, a console application, and drivers for Windows and Linux are provided to enable convenient configuration of the board and control of the I/O features in a laboratory or system assembly environment, or embedded in the customer's application software.

EMM-8EL-XT is compatible with Windows 7/Vista/2000/XP and Linux and is qualified for operation over the full industrial temperature range of -40°C to 85°C.

The EMM-8EL-XT is available in an 8-port PCIe/104 serial module with opto-isolation while the EMM-4EL-XT is in a 4-port PCIe/104 serial module with opto-isolation. The EMM-8E-XT is available in an 8-port PCIe/104 serial module, no opto-isolation while the EMM-4E-XT is in an 8-port PCIe/104 Serial Module, no opto-isolation.

The Emerald-MM-8EL-XT PCIe/104 serial module family is available. Single unit pricing starts at $675 for the EMM-8EL-XT model.

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