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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)
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

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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