Description

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.

5V-only operation and -40 to +85C industrial operating temperature range are standard features. The industry-standard 16C554 UART is compatible with all popular embedded operating systems.

Flexible Configuration

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.

Interrupt Sharing

To help conserve ISA bus interrupts, any number of ports can share the same interrupt level. If you have two boards in one system, both boards can share the same interrupt level as well. An interrupt status register is provided to indicate the status of each serial port's interrupt request signal.

Block Diagram

Configuration Options

Port Address Selection (Hex)

Interrupt Configuration

Interrupt levels are individually selectable for each port. The available interrupt levels are 2, 3, 4, 5, 6, 7, 10, 11, 12, and 15. In addition, a 1K Ohm pulldown resistor is provided for each port.

A single interrupt level can be shared by 2, 3, or 4 ports on one board and can even be shared by more than one board in the system. To enable interrupt sharing, set two or more interrupt level jumpers to the same level and pull out all but one pulldown resistor jumper.

I/O Headers

I/O Headers

Emerald-MM has two 20-pin I/O headers with two serial ports on each header. These headers mate with standard ribbon cable connectors. Our cable no. C-DB9M-18 provides a 20-pin IDC connector at one end to mate with the pin headers on the board, and it has two DB-9 male connectors at the other end with the standard PC serial port pinout. Each cable handles two ports; two cables provide access to all four ports on the board.

RS-422 Mode

RS-485 Mode

Specifications

Ordering Information

Models and Accessories

Emerald-MM-4M Available Models: EMM-4M-XT Emerald-MM 4-ch RS-232/422/485, Extended Temperature Available Please login or signup for an online quote request.

Available:	This model is generally available from stock. It is a mainstream or focus product in active promotion.
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MOQ or Minimum Order Quantity:	This model is not generally stocked but is buildable on demand. If we have it in stock you may purchase up to the available quantity. If it is out of stock then a minimum order quantity is required to meet the factory minimum lot size. This designation usually applies to less popular models of a current product or older products that have low customer demand. Contact Sales for further information.