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Emerald-MM-4M

4-Port RS-232/RS-422/RS-485 PC/104 Module
  • Details
  • Order information
  • 4 serial ports
  • Jumper configurable RS-232, RS-422, RS-485 on all ports
  • Flexible address and interrupt selection
  • Extended temperature operation

Our Emerald-MM PC/104 module gives you 4 serial ports operating at speeds up to 115kbps.

In RS-232 mode, the full complement of standard PC serial port signals (8 signals + ground) are provided for each port and are grouped onto two 20-pin headers (2 ports per header). In RS-422 mode, Signals RX+, RX-, TX+, and TX- are provided, along with ground. In RS-485 mode, signals TX+/RX+ and TX-/RX- are provided, along with ground.

A 16C554 quad serial port IC is used for the serial ports. This chip supports data transfer rates up to 115kbps and contains a 16-byte programmable FIFO buffer for each port to minimize processor overhead.

Emerald-MM offers more interrupt level and I/O address options than other quad serial port modules. Therefore, integrating the board into your computer system is a simpler task. Eight different I/O address combinations and 10 different interrupt levels are available.

The board is available in several models with different combinations of jumper-configurable serial protocols:


  • EMM-XT 2 ports RS-232, 2 ports RS-232/422/485
  • EMM-4485-XT 4 ports RS-422/485
  • EMM-4M-XT 4 ports RS-232/422/485

Model Description
EMM-4M-XT Emerald-MM 4port Multiprotocol PC/104 Module
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