4-port RS-232 PCI Express serial board

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Features and Benefits 

  • PCI Express x1 compliant
  • 921.6 kbps maximum baudrate for super fast data transmission
  • 128-byte FIFO and on-chip H/W, S/W flow control
  • Low profile form factor fits small-sized PCs
  • Drivers provided for a broad selection of operating systems, including the latest Windows and Linux
  • Easy maintenance with on-board LEDs and management software



The CP-104EL-A is a smart, 4-port PCI Express board designed for POS and ATM applications. It is a top choice of industrial automation engineers and system integrators, and supports many different operating systems, including Windows, Linux, and even Unix. In addition, each of the board’s 4 RS-232 serial ports supports a super fast 921.6 kbps baudrate. The CP-104EL-A provides full modem control signals to ensure compatibility with a wide range of serial peripherals, and its PCI Express “x1” classification allows it to be installed in any PCI Express slot.


Smaller Form Factor

The CP-104EL-A is a low profile board that is compatible with any PCI Express slot. The board requires only a 3.3 VDC power supply, which means that the board fits any host computer, ranging from shoebox to standard-sized PCs.


Drivers Provided for Windows, Linux, and Unix

Moxa continues to support a wide variety of operating systems, and the CP-104EL-A board is no exception. Reliable Windows COM and Linux/Unix TTY drivers are provided for all Moxa boards, and other operating systems, such as WEPOS, are also supported for embedded integration.


Comm. Controller 16C550C compatible
Bus PCI Express x1
Connector DB44 female
Serial Interface
Number of Ports 4
Serial Standards RS-232
Max. No. of Boards per PC 4
Baudrate 50 bps to 921.6 kbps
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, XON/XOFF
Serial Signals
Physical Characteristics
Dimensions 67.21 x 103 mm (2.65 x 4.06 in)
Driver Support
Windows Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1/10 (x86/x64), Windows 2008 R2/2012/2012 R2 (x64), DOS
Linux Linux 2.4.x, 2.6.x, 3.x
Unix-like Systems QNX 6, SCO OpenServer, UnixWare 7, Solaris 10 
Note: Please refer to Moxa’s website for the latest driver support information.
Environmental Limits
Operating Temperature 0 to 55°C (32 to 131°F)
Storage Temperature -20 to 85°C (-4 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Standards and Certifications
EMC EN 55022/24
EMI CISPR 22, FCC Part 15B Class B
EMS IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m
IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV
IEC 61000-4-5 Surge: Power: 2 kV
IEC 61000-4-6 CS: 150 kHz to 80 MHz: 3 V/m; Signal: 3 V/m
IEC 61000-4-8 PFMF
IEC 61000-4-11
MTBF (mean time between failures)
Time 3,601,447 hrs
Standard Telcordia (Bellcore) TR/SR
Power Requirements
Input Current 805 mA @ 3.3 VDC
Warranty Period 5 years
Details See www.moxa.com/warranty

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Available Models

  Model No. Description
CP-104EL-A-DB25M 4-port RS-232 low profile PCI Express x1 serial board (includes DB25 male cable)
CP-104EL-A-DB9M 4-port RS-232 PCI low profile Express x1 serial board (includes DB9 male cable)

Optional Accessories

Other Accessories
  Model No. Description
CBL-M44M25x4-50 DB44(M) to 4 x DB25(M) Cable
CBL-M44M9x4-50 DB44(M) to 4 x DB9(M) Cable