Emerald-MM-Opto provides an integrated, rugged, and reliable solution for PC/104-expandable embedded systems requiring serial communications in demanding applications. It offers 2 or 4 optically isolated serial ports with RS-232, RS-422, and RS-485 protocols, as well as 24 digital I/O lines, all on a single board.

Optical isolation of 1000V DC or AC protects your embedded system from ground differentials or noise spikes that would damage non-isolated boards. Each port is isolated from the other ports as well as the system. Extended temperature capability (-40 to +85ºC) enables the board to operate in vehicles such as trains and buses without concern for temperature swings. These features enable Emerald-MM-Opto to provide reliable serial communications in harsh environments such as trains and buses.

In addition to ruggedness, Emerald-MM-Opto offers flexibility and advanced features. Each serial port is independently configurable for protocol and IRQ settings. Eight different I/O address combinations are built in. The 16C2850 UART chips with 128-byte FIFOs support high-speed data rates at up to 460kbps without overloading the system processor. Auto-flow control enables easy RS-485 operation by automatically enabling and disabling the transmitter during data transmission, to prevent bus conflicts or excessive software overhead.

The 24 digital I/O lines are based on an 82C55 chip and feature programmable direction in 4- and 8-bit groups. All I/O lines contain user-configurable 10K Ohm pull-up resistors for convenience. This 2-in-1 combination of serial ports and digital I/O can help lower the size and cost of your embedded system by eliminating one additional board from your PC/104 stack.

  • 2 or 4 RS-232/422/485 optically isolated serial ports
  • Isolation of 1000V AC or DC, port to port or port to system
  • 150Ω termination resistors for RS-422/485
  • 460.8kbps max data rate
  • 128-byte transmit / receive FIFOs
  • Auto-flow RS-485 control
  • 24 digital I/O using 82C55
  • -40ºC to +85ºC extended temperature operation
  • PC/104 form factor

DIAMOND SYSTEMS CORPORATION, founded in 1989, provides compact, rugged embedded computing solutions to customers around the world in a wide range of industries. We deliver both board-level products and system-level solutions incorporating these products. Our expertise is in analog I/O technology, high integration, customization, and rugged design. Our embedded CPU boards provide a unique level of integration by incorporating data acquisition and other features right on the board, reducing size and cost. Our analog I/O capabilities include our patented, best-in-class autocalibration technology that reduces analog measurement errors by a factor of 10 over competitors' solutions.



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