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Products   >   I/O Expansion Modules   >   Communications Modules   >   Emerald-MM-4M
      EMERALD-MM-4M  4-Port RS-232/422/485 PC/104 Module   PC104
Emerald-MM-4M: I/O Expansion Modules, Rugged, wide-temperature PC/104, PC/104-<i>Plus</i>, PCIe/104 / OneBank, PCIe Minicard, and FeaturePak modules featuring standard and optoisolated RS-232/422/485 serial interfaces, Ethernet, CAN bus, and digital I/O functions., PC/104
OverviewI/O HeadersSpecificationsOrdering
Information
Support

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

Emerald-MM-4M: I/O Expansion Modules, Rugged, wide-temperature PC/104, PC/104-<i>Plus</i>, PCIe/104 / OneBank, PCIe Minicard, and FeaturePak modules featuring standard and optoisolated RS-232/422/485 serial interfaces, Ethernet, CAN bus, and digital I/O functions., PC/104

Configuration Options

Port Address Selection (Hex)

Selection Port 1 Port 2 Port 3 Port 4 Status Register
0 3F8 2F8 3E8 2E8 220
1 3E8 2E8 3A8 2A8 220
2 380 388 288 230 224
3 240 248 260 268 224
4 100 108 110 118 240
5 120 128 130 138 244
6 140 148 150 158 248
7 160 168 170 178 24C

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

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.

DCD 1 1 2 DSR 1
RXD 1 3 4 RTS 1
TXD 1 5 6 CTS 1
DTR 1 7 8 RI 1
GND 9 10 N/C
DCD 2 11 12 DSR 2
RXD 2 13 14 RTS 2
TXD 2 15 16 CTS 2
DTR 2 17 18 RI 2
GND 19 20 N/C

RS-422 Mode

N/C 1 2 N/C
TXD+ 1 3 4 TXD- 1
GND 5 6 RXD- 1
RXD+ 1 7 8 N/C
GND 9 10 N/C
N/C 11 12 N/C
TXD+ 2 13 14 TXD- 2
GND 15 16 RXD- 2
RXD+ 2 17 18 N/C
GND 19 20 N/C

RS-485 Mode

N/C 1 2 N/C
TX/RX+ 1 3 4 TX/RX- 1
GND 5 6 N/C
N/C 7 8 N/C
GND 9 10 N/C
N/C 11 12 N/C
TX/RX + 2 13 14 TX/RX- 2
GND 15 16 N/C
N/C 17 18 N/C
GND 19 20 N/C

Serial Ports
Number of ports 4
Protocols supported RS-232, RS-422, RS-485
Protocol selection Individual jumper selection for each port
Maximum baud rate 230.4kbps
Communication parameters 5, 6, 7, or 8 data bits; Even, odd, or no parity
Short circuit protection All outputs protected against continuous short circuit
RS-232 Protocol
Input impedance 3KΩ minimum
Input voltage swing ±30V maximum
Output voltage swing ±5V min, ±7V typical
RS-422, RS-485 Protocols
Differential -0.2V min, +0.2V max input threshold
Input impedance 12KΩ minimum
Input current +1.0µA max (Vin = 12V), -0.8µA max (VIN = -7V)
Differential output voltage 2.0V min (RL=50Ω)
High/low states differential output voltage symmetry 0.2V maximum
General
I/O Headers 2 20-position (2x10) .1" pitch right-angle pin headers
Dimensions 3.55" x 3.775" / 90x96mm (not including I/O connector pins)
Power supply +5VDC ±10%
Current consumption 80mA typical, all outputs unloaded
PC/104 bus 8-bit and 16-bit bus headers are installed; 8-bit databus width
Weight 2.6oz/74g
MTBF 555,000 hrs
RoHS Compliant

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Emerald-MM-4M
available models:
EMM-4M-XT
Emerald-MM 4-ch RS-232/422/485, Extended Temperature
Available
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Product Support for Emerald-MM-4M

User Manual

Emerald-MM-4M User Manual(.pdf, 311.5 KB)
Datasheet

Emerald-MM-4M Datasheet(.pdf, 112.5 KB)
Technical Documents

Adding a serial port in Linux(.pdf, 578.3 KB)
Adding a serial port in Windows XP(.doc, 363.5 KB)
ST16C654 Quad UART Datasheet(.pdf, 1.1 MB)
Support

Emerald-MM End of Life Notice(.pdf, 54.8 KB)
FEATURES
4 serial ports
Jumper configurable RS-232, RS-422, RS-485 on all ports
Flexible address and interrupt selection
Full interrupt sharing capability
Interrupt status register for Windows NT
Dual 20-pin I/O headers (2 ports per header)
+5V only power supply
-40°C to +85°C extended temperature operation
ONLINE SUPPORT
See Emerald-MM-4M Technical Resources
Request Product information
Request Technical Support
DOWNLOADS
Emerald-MM-4M User Manual
(.pdf, 311.5 kb)
Emerald-MM-4M Datasheet
(.pdf, 112.5 kb)
ACCESSORIES
Customers who use this product also use:
2-port DB9 Serial Cable Serial port cable, 2x DB9M to 2x10 .1" socket