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High Performance PCI/104-Express 4- or 8-Port RS-232/422/485 Serial I/O Module with Opto‑isolation
  • Details
  • Specification
  • Order information
  • Number of serial ports: 4 or 8
  • Protocols: RS-232, RS-422, RS-485
  • Shock/vibration: MIL-STD-202G compatible
  • Operating temperature: -40°C to +85°C (-40°F to +185°F)

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.

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.

Software Support
The EMM-8EL-XT family is compatible with Windows 7/Vista/2000/XP and Linux 2.6. All drivers are shipped with the product.

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.

Technical specifications

Serial ports

Number of serial ports4 or 8
ProtocolsRS-232, RS-422, RS-485 configured with software, no jumpers
Maximum baud rateRS-232 mode: 1Mbps
RS-422/485 mode: 10Mbps
UART16550 compatible octal UART with 256-byte TX/RX FIFOs
TransceiversSP330 multiprotocol transceivers, one per port
Communications parameters5, 6, 7, or 8 data bits; Even, odd, or no parity
TerminationSoftware programmable RS-422/485 termination
IsolationIndependent 2500VRMS isolation port-by-port
ESD protection+/-15KV on each port
Short circuit protectionContinuous, all outputs

RS-232 mode

Input Impedance3KΩ min
Input voltage swing±30V maximum
Output voltage swing±5V min, ±7V typical

RS-422/485 modes

Differential input threshold-0.2V min, +0.2V max
Input impedance12KΩ minimum
Input current+1.0mA max (Vin = 12V)
-0.8mA max (Vin = -7V)
Differential output voltage2.0V min (RL=50Ω)
High/low states differential output voltage symmetry0.2V max

Digital / Analog I/O

Number of lines8 individually programmable lines:
8 as digital input or output
7 as 12-bit analog input
Analog input ranges0-2.048V or 0-3.3V


Host interfacePCIex1 using PCIe/104 OneBank connector
Inrush currentStaggered turn-on of isolated devices for reduced inrush current at power on
On-board microcontrollerOn-board PIC microcontroller with flash to manage and store configurations
ConnectorsLatching connectors on all ports for increased ruggedness
Dimensions3.55" x 3.775" (90mm x 96mm)
Conforms to PCIe/104 OneBank form factor supporting Type 1 and Type 2
Power supply+5VDC ±5%
Current consumption160mA typical, all outputs unloaded
Software driversWindows Embedded Standard 7, XP, 2000 and Vista
Linux 2.6.16, 2.6.31 and 2.6.32
MTBF579,352 hours at 20°C
Weight2.5oz (71g)

Environmental and physical specifications

Operating temperature-40°C to +85°C (-40°F to +185°F)
Operating humidity5% to 95% noncondensing
ShockMIL-STD-202G compatible
VibrationMIL-STD-202G compatible
Model Description
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