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Products   >   I/O Expansion Modules   >   Communications Modules   >   Emerald-MM-Opto 4-Port Opto Serial Module
FEATURES
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
ACCESSORIES
Customers who use this product also use:
1-port DB9 Serial Cable
26-pin Digital I/O Cable

This product can be customized and ruggedized. Click here for more information.
ONLINE SUPPORT
See Emerald-MM-Opto 4-Port Opto Serial Module Technical Resources
Request Product information
Request Technical Support
DOWNLOADS
Emerald-MM-Opto datasheet
(.pdf, 132.9 kb)
EMM-OPTO-XT User Manual
(.pdf, 428.4 kb)
Universal Driver 6.02 Release Notes
(.pdf, 141.3 kb)
Adding a serial port in Windows XP
(.doc, 363.5 kb)
Emerald-MM-OPTO Example Programs for UD 5.91
(.zip, 153.2 kb)
Universal Driver Software
Universal Driver 6.02 for DOS
(.zip, 176.5 kb)
Universal Driver 6.02 for Windows CE
(.zip, 106.7 kb)
Universal Driver 6.02 for Windows XP
(.zip, 331.8 kb)
Universal Driver 6.02 for Linux
(.bz2, 148.7 kb)
Universal Driver 5.92 for WinCE
(.zip, 97.4 kb)

Emerald-MM-Opto 4-Port Opto Serial Module

Quad Opto-Isolated RS-232/422/485 Port PC/104 Module with DIO

Emerald-MM-Opto  4-Port Opto Serial Module
click for a larger image
Description
System Block Diagram
Configuration
I/O Headers
Digital I/O
Specifications
Get an online quote
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Description

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.

Emerald-MM-Opto also offers multiple termination methods on the serial ports to support varying interface requirements. In RS-422 or RS-485 networks, termination resistors are normally installed at the endpoints of the cables to minimize reflections on the lines. The board provides jumper-selectable termination and pull-up/pull-down resistors for this purpose. The sensible jumper positioning and layout help simplify board configuration and minimize confusion.

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.

Diamond Systems offers appropriate mating cables for your convenience. Cable no. C-DB9M-1 provides a DB-9 male connector with standard PC serial port pinout. Each serial port requires one cable. Cable no. C-26-18 is a 26-conductor ribbon cable for the digital I/O lines.

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System Block Diagram


EMERALD-MM-OPTO Block Diagram

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Configuration

The following I/O addresses are selected with jumpers or 0-ohm resistors. All addresses are in hex.

A B C Port 1 Port 2 Port 3 Port 4 Interrupt status
In In In 3F8-3FF 2F8-2FF 3E8-3EF 2E8-2EF 220
Out In In 3E8-3EF 2E8-2EF 3A8-3AF 2A8-2AF 220
In Out In 380-387 388-38F 288-28F 230-23F 224
Out Out In 240-247 248-24F 260-267 268-26F 224
In In Out 100-107 108-10F 110-117 118-11F 240
Out In Out 120-127 128-12F 130-137 138-13F 244
In Out Out 140-147 148-14F 150-157 158-15F 248
Out Out Out 160-167 168-16F 170-177 178-17F 24C

The interrupt status register indicates the pending interrupt status of all 4 serial ports. It is a read-only register. Only bits 3-0 are used. Bits 7-4 read back as 0 always.

Bit 7 6 5 4 3 2 1 0
Function 0 0 0 0 IRQD IRQC IRQB IRQA
IRQD-A = interrupt status for ports 4-1, respectively. 1 = interrupt pending, 0 = no interrupt pending.

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I/O Headers

Each serial port has its own 10-pin (2x5) pin header with the following pinouts. These pinouts are consistent with the pinout of the SP334 transceiver for each mode.

(NC = no connection)
  RS-232 Configuration RS-422 Configuration RS-485 Configuration
1 NC RXD+ TXD+/RXD+
2 NC CTS- NC
3 RXD RXD- TXD-/RXD-
4 RTS RTS+ NC
5 TXD TXD+ TXD+/RXD+
6 CTS CTS+ NC
7 NC TXD- TXD-\RXD-
8 NC RTS- NC
9 ISO GND ISO GND ISO GND
10 NC NC NC

In RS-485 mode, only one pair of signal wires is used, plus ground reference. Either pins 1 and 3 or pins 5 and 7 may be used. These signal pairs are duplicated on the connector due to the jumpering of the RX and TX lines on the configuration jumper block.

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Digital I/O

The digital I/O is provided on a 26-pin (2x13) pin header with the following pinout.

C7 1 2 C6
C5 3 4 C4
C3 5 6 C2
C1 7 8 C0
B7 9 10 B6
B5 11 12 B4
B3 13 14 B2
B1 15 16 B0
A7 17 18 A6
A5 19 20 A4
A3 21 22 A2
A1 23 24 A0
+5V 25 26 GND

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Specifications

Serial Ports 2 or 4, RS-232/422/485
Data Rates RS-232, 230.4kbps max
RS-422/485: 460.8kbps max
Signals RS-232: RXD, TXD, RTS, CTS
RS-422/485: RXD, TXD
Addresses 8 preconfigured standard I/O address options; custom addresses available
Interrupts IRQ levels 2, 3, 4, 5, 6, 7, 10, 12, 15;
Interrupt sharing supported
Isolation 1000V AC or DC, port to port or port to system
Termination 150Ω with 1KΩ pull-up/pull-down
UART 16C2850 with 128-byte FIFO and auto-flow control
Digital I/O 24 programmable direction using 82C55
DIO termination 10KΩ pull-up
Connectors Individual 10-pin connector for each serial port; 26-pin connector for digital I/O
Bus PC/104 16-bit bus (8-bit data)
Power +5VDC @ 300mA typical, all outputs open
Operating Temperature -40ºC to +85ºC
Dimensions 3.550"W x 3.775"H
RoHS Compliant

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Get an online quote

 
Emerald-MM-Opto 4-Port Opto Serial Module
available models:
EMM-OPT4-XT
4 Opto-Isolated RS-232/422/485 + 24 Digital I/O
Please login or signup for an online quote request.


 
Cables and accessories
available models:
C-26-18
Dual 26-pin connectors, 18 inches
C-DB9M-1
10-pin to DB9M, 18 inches
Please login or signup for an online quote request.
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