PCI Express 8-Port RS-232, RS-422, RS-485 Serial Interface

Part: 7804e   Model: Ultra COMM+8.PCIE

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Description

The 7804e PCI Express serial interface provides eight 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 which 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 7804e 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 7804e is a PCI Express X1 board compatible with any low profile PCI Express slot. A standard profile bracket  is also included. The board ships with a 36-inch cable that terminates to eight DB9M connectors.

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Additional information

Board Connector

DB78F

Operating Temperature

0°C to 70°C (32°F to 158°F)

Storage Temperature

-50°C to 105°C (-58°F to 221°F)

Serial Connector(s)

DB9M

RoHS Compliant

Yes

# of Ports

8

PC Bracket

Low Profile, Standard Height

Oscillator

62.5 MHz

Max Data Rate

921.6K bps

Cable Connector(s)

DB9M (8)

Max Data Distance

50 feet (RS-232), 4000 feet (RS-485)

Host Interface(s)

PCI Express

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Electrical Interface

RS-232, RS-422, RS-485

Dimensions

5.2" (L) x 4.4" (H)

Communications Chip

16C954

UART Series

950 UART

  • 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 any low profile PCI Express slot. A standard profile bracket  is also included.
  • All modem control signals implemented in RS-232 mode
  • Automatic RS-485 enable/disable in hardware
  • Included 36″ cable terminates to eight DB9M connectors (Item# CA145)

Windows Software

Software: SeaCOM - Windows

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