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Products   >   I/O Expansion Modules   >   Communications Modules   >   Emerald-MM-8P 8-Port Serial Module
FEATURES
8 serial ports with up to 460.8kbps data rates
16C654 UARTS with 64-byte FIFOs
Software-configurable RS-232/RS-422/RS-485 protocols
Software selectable I/O addresses and interrupt levels
Supports interrupt sharing
EEPROM storage of configuration data for automatic power-on configuration
8 programmable digital I/O lines
Dual 40-pin I/O headers, 4 ports per header
+5V only operation
-40°C to +85°C operation
PC/104 form factor
ACCESSORIES
Customers who use this product also use:
4-port DB9 Serial Cable

This product can be customized and ruggedized. Click here for more information.
ONLINE SUPPORT
See Emerald-MM-8P 8-Port Serial Module Technical Resources
Request Product information
Request Technical Support
DOWNLOADS
Emerald-MM-8P datasheet
(.pdf, 137.5 kb)
EMM-8P-XT Manual
(.pdf, 480.7 kb)
ST16C654 Quad UART Datasheet
(.pdf, 1.1 MB)
Adding a serial port in Windows XP
(.doc, 363.5 kb)
Emerald-MM-8P Temperature Test Report
(.pdf, 336.5 kb)
Adding a serial port in Linux
(.pdf, 578.3 kb)

Emerald-MM-8P 8-Port Serial Module

8-Channel, Software Programmable PC/104 Serial Port Module

Emerald-MM-8P 8-Port Serial Module
click for a larger image
Description
Block Diagram
Operating Systems Compatibility
Specifications
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Description

Emerald-MM-8P offers 8 multi-protocol serial ports on a single PC/104 module with complete software configurability via the operating system. Each port can be individually selected for RS-232, RS-422, or RS-485 under software control. Both local-echo and non-local-echo modes are supported for RS-485. I/O addresses and interrupt levels are also programmable, with interrupt sharing available for any number of ports. Each port may further be enabled or disabled in software. All configuration data is stored in an on-board EEPROM that is loaded automatically on power-up.

For applications where fixed addresses are desired, four groups of preset addresses are available with jumper settings that override the programmed settings. Line termination for RS-422/485 modes is also jumper-selectable.

Emerald-MM-8P offers 8 convenient digital I/O lines. The direction of each line is independently programmable. Diamond’s Universal Driver software provides software support for these digital I/O lines.

Two I/O headers are provided, with four serial ports and four digital I/O lines on each header. The board operates on +5V only, eliminating the need for a +12V supply that is often required for serial port operation.

Emerald-MM-8P is based on the 16C654 quad serial port IC. This device contains 4 identical sets of registers, one for each port, and is compatible with the standard PC serial port. Each port contains 64-byte transmit and receive FIFOs to support the high-speed 460.8kbps data rates. Model EMM-8P-XT is backward compatible with Diamond Systems’ EMM-8M-XT and EMM-8232-XT boards.

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Block Diagram


Emerald-MM-8P Block Diagram

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Operating Systems Compatibility

The Emerald-MM-8P is compatible with DOS, Linux, QNX and Windows 98/NT/2000/XP/CE.

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Specifications

Serial Ports
Number of serial ports 8
Protocols RS-232, RS-422, RS-485 (local and no echo)
Configuration All features software configurable
Maximum baud rate 460.8kbps
Communications parameters 5, 6, 7, or 8 data bits; Even, odd, or no parity
Short circuit protection Continuous, all outputs
RS-232 mode
Input Impedance 3KΩ min
Input voltage swing ±30V maximum
Output voltage swing ±5V min, ±7V typical
RS-422/RS-485 modes:
Differential input threshold -0.2V min, +0.2V max
Input impedance 12KΩ minimum
Input current +1.0mA max (Vin = 12V)
-0.8mA max (Vin = -7V)
Differential output voltage 2.0V min (RL=50Ω)
High/low states differentia
output voltage symmetry
0.2V max
Digital I/O
Number of I/O lines 8 in, 8 out
Input voltage Low: -0.3V min, 0.8V max
Output voltage Low: 0.0V min, 0.4V max (IOL = 6mA max)
General
I/O header 2 40-position (2x10) .025" square pin header on .1" centers;
Headers mate with standard ribbon cable (IDC) connectors
Dimensions 3.55" x 3.775"
Power supply +5VDC ±10%
Current consumption 160mA typical, all outputs unloaded
Operating temperature -40°C to +85°C standard, all versions
MTBF EMM-8P-XT: 490,502 hours
RoHS Compliant

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Get an online quote

 
Emerald-MM-8P 8-Port Serial Module
available models:
EMM-8P-XT
8 RS-232/422/485 Serial Ports PC/104 Module
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Cables and accessories
available models:
C-DB9M-4
Quad DB9 male to 40-pin header 18" cable, serial ports 1-4 (uses 2)
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