7404e Board with Included DB37 Female to (4) DB9 Male Cable (Item# CA143)
7404e Board with Included DB37 Female to (4) DB9 Male Cable (Item# CA143)

Part# 7404e

(COMM+4.PCIe)

PCI Express 4-Port RS-232, RS-422, RS-485 Serial Interface


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The 7404e PCI Express serial interface provides four multifunction serial ports, each individually field-configurable for RS-232, RS-422, or RS-485. Each serial port utilizes a 16C954 UART with 128-byte Tx/Rx FIFOs that enables data rates to 921.6K bps for reliable high-speed communications in data intensive applications. This high-performance UART includes 9-bit framing support and is register compatible with legacy 16550 software applications. In addition, the board derives a 62.5 MHz clock from the PCI Express link. This ultra high speed clock is divided by a flexible 8-bit clock prescalar with 1/8 steps to provide support for the widest range of standard and non-standard baud rates.

In RS-485 mode the board provides automatic control of the RS-485 driver in hardware, eliminating the need for application software control. This allows the 7404e to be used with standard serial communications applications and removes the risk of bus contention and data corruption. Additionally, RS-485 network termination, critical to robust multi-drop communication, can be selectively added to the circuit via DIP-switches. In RS-232 mode, all modem control signals are implemented for maximum compatibility with a variety of serial peripherals.

Sealevel SeaCOM software driver and utilities make installation and operation easy using Microsoft Windows and Linux operating systems.

The 7404e is a PCI Express X1 board compatible with any PCI Express slot. The board ships with a 36 inch cable (Item# CA143) that terminates to four DB9M connectors.
Host Interface PCI Express
# of Ports 4
Electrical Interface RS-232, RS-422, RS-485
RoHS Yes
UART Series 950 UART
Serial Connector(s) DB9M
PC Bracket Standard Height
Communications Chip 16C954
Oscillator 62.5 MHz
Max Data Rate 921.6K bps
Max Data Distance 50 feet (RS-232), 4000 feet (RS-485)
Cable Connector DB9M (4)
Board Connector DB37M
Operating Temperature 0 - +70C
Storage Temperature -50 - +105C
Humidity Range 10 - 90% Relative Humidity, Non-Condensing
  • • Each port individually configurable for RS-232, RS-422, or RS-485
  • • 16C954 buffered UARTs with 128-byte FIFOs
  • • Oscillator and clock prescalar support wide range of baud rates
  • • Supports 9-bit protocol framing
  • • Each port supports data rates to 921.6K bps
  • • RS-485 line termination, pull-up and pull-down resistors for each port are selectable via dipswitch
  • • RS-485 ECHO can be enabled/disabled via dipswitch
  • • PCI Express X1 compliant
  • • Compatible with all standard size PCI Express slots
  • • All modem control signals implemented in RS-232 mode
  • • Automatic RS-485 enable/disable in hardware
  • • Included 36" cable terminates to four DB9M connectors (Item# CA143)




RS-422 to RS-530 Cable
Part#CA176
RS-422 to RS-530 Cable

$9.95

Terminal Block
Part#TB34
Terminal Block

$8.95

Terminal Block
Part#TB05
Terminal Block

$19.95

Terminal Block Kit
Part#TB34-2
Terminal Block Kit

$14.95

DB9 207M SMPTE Cable
Part#CA190
DB9 207M SMPTE Cable

$19.95

DB9F to Opto 22 DB9F
Part#DB103
DB9F to Opto 22 DB9F

$9.95

DB9 to DB25 Serial Cable
Part#CA177
DB9 to DB25 Serial Cable

$7.95

Terminal Block Kit
Part#KT105
Terminal Block Kit

$28.95

DB9 Serial Extension Cable
Part#CA127
DB9 Serial Extension Cable

$9.95

Terminal Block
Part#TB06
Terminal Block

$24.95

Terminal Block Kit
Part#TB34-4
Terminal Block Kit

$29.95

DB78 Extension Cable
Part#CA233
DB78 Extension Cable

$79.95

Modular Adapter
Part#RJ9S8
Modular Adapter

$3.95

DB9 Cable with Tinned Leads
Part#CA186
DB9 Cable with Tinned Leads

$9.95

Terminal Block Kit
Part#KT106
Terminal Block Kit

$43.95

Proudly Made in the USA
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