The Emerald-MM-8EL-XT is a family of high performance PCIe/104 "OneBank" serial I/O modules offering 4 or 8 multiprotocol serial ports with software-controlled configuration and optional opto-isolation.

Available Models

  • EMM-8EL-XT 8-Port serial module with opto-isolation 
  • EMM-4EL-XT 4-Port serial module with opto-isolation 
  • EMM-8E-XT 8-Port serial module without opto-isolation 
  • EMM-4E-XT 4-Port serial module without opto-isolation

The serial ports are based on a high speed PCIe octal UART with 256-byte TX/RX FIFOs and auto RS-485 transmit control. Each serial port can be independently configured for RS-232, RS-422, or RS-485 protocols, along with programmable 120-ohm line termination. Each port is independently isolated with an isolated power + signal chip, plus additional isolators for control signals. The board features intelligent power management that limits inrush current on power-up and also enables power-down of unused serial ports for power savings.

Opto-isolated models feature independent 2500VRMS isolation circuits for enhanced reliability in vehicle or long cable applications. All ports also feature +/-15KV ESD protection. Each serial port is available on an independent latching connector for increased isolation and ruggedness. With its wide operating temperature range and high resistance to shock and vibration, the EMM-8EL-XT fits a wide variety of rugged and on-vehicle embedded serial I/O application needs.

EMM-8EL-XT also offers 8 digital/analog I/O lines which are programmable from the on-board microcontroller. Each I/O line can be configured for digital input or output. Seven of the I/O lines can be configured for 12-bit A/D input with selectable 0-2.048V or 0-3.3V input ranges.

EMM-8EL-XT contains no configuration jumpers; all configuration and control is done with an onboard microcontroller. All configuration settings are stored in the microcontroller's flash memory and are automatically loaded on power-up


The EMM-8EL-XT family is compatible with Windows 7/Vista/2000/XP and Linux 2.6.

The on-board microcontroller is managed with a comprehensive software suite that makes configuring the EMM-8EL-XT fast and simple. A graphical control panel, a console application, and drivers for Windows and Linux are provided to enable convenient configuration of the board and control of the I/O features in a laboratory or system assembly environment, or embedded in the customer's application software.


Interface4 or 8 RS-232, RS-422 or RS-485 ports
Configured with software, no jumpers
16550 compatible octal UART with 256-byte TX/RX FIFOs
SP330 multiprotocol transceivers, one per port
5, 6, 7, or 8 data bits; Even, odd, or no parity
Software programmable RS-422/485 termination
Isolation: Independent 2500VRMS isolation port-by-port
ESD protection: +/-15KV on each port
Short circuit protection: Continuous, all outputs
RS-232Input impedance: 3KOhm minimum
Input voltage swing: ±30V maximum
Output voltage swing: ±5V min, ±7V typical
RS-422/485Differential: -0.2V min, +0.2V max input threshold
Input impedance: 12K Ohm minimum
Input current: +1.0mA max (VIN = 12V), -0.8mA max (VIN = -7V)
Differential output voltage: 2.0V min (RL=50 Ohm)
High/low states differential output voltage symmetry: 0.2V maximum
Data RatesRS-232 mode: Up to 1Mbps
RS-422/485 mode: Up to 10Mbps
Address/IRQAvailable interrupt levels are 2, 3, 4, 5, 6, 7, 10, 11, 12, and 15
OtherDigital / Analog I/O number of lines:
• 8 individually programmable lines:
• 8 as digital input or output
• 7 as 12-bit analog input
Analog input ranges
• 0-2.048V or 0-3.3V
Connector(s)Latching connectors on all ports for increased ruggedness


ExpansionPCIex1 using PCIe/104 OneBank connector
PCI-104 connector (passthrough)
Electrical+5VDC ±10%
160mA typical, all outputs unloaded
MechanicalWidth: 96 mm x 90 mm, 3.55" x 3.775"
Conforms to PCIe/104 OneBank form factor
Conformal CoatingOn request
SoftwareWindows Embedded Standard 7, XP, 2000, Vista, Windows 7, Windows 8
Linux 2.6.16, 2.6.31 and 2.6.32
TemperatureTemperature range (operation): -40°C to +85°C
Temperature range (storage): -40°C to +85°C
Humidity5% to 95% noncondensing
Weight2.5oz (71g)
VibrationMIL-STD-202G compatible
ShockMIL-STD-202G compatible
MTBF579,352 hours at 20°C
Warranty1 Year



Emerald-MM-8EL 8-port PCI/104-Express Serial Module with opto-isolation

Emerald-MM-4EL 4-port PCI/104-Express Serial Module with opto-isolation

Emerald-MM-8E 8-port PCI/104-Express Serial Module, no opto-isolation

Emerald-MM-4E 4-port PCI/104-Express Serial Module, no opto-isolation
AccessoriesCK-EMM-4EL Cable Kit with 4 serial cables & 1 digital/analog cable
CK-EMM-8EL Cable Kit with 8 serial cables & 1 digital/analog cable
Recab UK
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