Diamond Systems DS-MPE-SER4OPT

Adds Four RS232C or RS485 Opto Isolated Interfaces via Mini PCIe Socket


The DS-MPE-SER4OPT is a rugged, low cost 4-port opto-isolated PCIe MiniCard serial module that is ideal for serial I/O expansion in embedded and OEM applications.

The DS-MPE-SER4OPT offers 4 RS-232/RS-485 opto-isolated serial ports in a PCIe MiniCard form factor. Each port offers 16C550 compatibility and ultra-deep 256-byte TX/RX FIFOs. Maximum data rates are 1Mbps in RS-232 mode and 10Mbps in RS-485 mode. The board is available preconfigured for 4 RS-232 ports, 4 RS-485 ports, or a combination of 2 RS-232 and 2 RS-485 ports. I/O signals are provided on two miniature latching connectors, with 2 ports per connector.

Each pair of serial ports on the DS-MPE-SER4OPT offers up to 500V isolation from the system ground. Optoisolation increases reliability in applications with long cable runs, where a difference in ground potential can cause significant ground loop currents, damaging non-isolated boards and equipment. Isolation on this miniature board is achieved through a combination of highly integrated isolated power + data components, careful component placement and layout, and a safety-enhancing insulation film on the bottom side, which prevents accidental contact with components on the carrier board.

Extended temperature capability (-40°C to +85°C) enables the board to operate in environments with extreme temperature swings, such as vehicles or outdoor installations. In addition, the board may be custom-configured with 0-ohm resistors in place of jumper blocks for increased ruggedness in high-vibration environments.

The DS-MPE-SER4OPT product comes with the 4-port PCIe MiniCard opto-isolated serial module, the CK-SER4M cable kit, and a hardware kit with jumpers and screws.


Interface4x RS-232 or 485 serial ports
16C550 compatible UARTs
256-byte TX/RX FIFO
XR17V354 PCIe interface quad UART
SP336 multi-mode transceivers support RS-232 and RS-485
RS-485 termination jumper selectable
Data RatesRS-232: Up to 1Mbps
RS-485: Up to 10Mbps
Address/IRQPlug and play
OtherIsolation: +/-500V input/output



ExpansionPCIe MiniCard full size format
Electrical+3.3VDC +/- 5%
0.462W consumption, all outputs unloaded
Mechanical50.95mm x 30mm (2” x 1.18”)
Conformal CoatingOn request
SoftwareWindows 7, XP, Vista, 2000
Linux 2.6.12, 2.6.27, 2.6.31, 2.6.32
TemperatureTemperature range (operation): -40°C to +85°C
Temperature range (storage): -40°C to +85°C
Humidity5% to 95% noncondensing
Weight8.5g (0.3oz)
Warranty1 Year


Ordering Details

4-port RS-232 PCIe MiniCard Opto-Isolated Serial Module (inc cable kit)

4-port RS-485 PCIe MiniCard Opto-Isolated Serial Module (inc cable kit)

2-port RS-232, 2-port RS-485 PCIe MiniCard Opto-Isolated Serial Module (inc cable kit)
Cable Kit with two dual serial cables
Order OnlineDiamond Systems DS-MPE-SER4OPT - Order Online
Recab UK
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