Impulse 7804 User Manual

8 Port PCI Serial

PCI RS‑232, RS‑422, RS‑485 Serial Interface

7804

Item #

The Ultra COMM+8.PCI is a multi‑interface, eight port,

Universal Bus (3.3V or 5V) compatible PCI adapter. Offering eight individual eld‑selectable RS‑232, RS‑422, or RS‑485 channels, the Ultra COMM+8.PCI delivers ultimate exibility

for expanding serial communications.

The Ultra COMM+8.PCI supports standard PC data rates

and boasts a top speed of 921.6K bps. The board is

designed using the XR16C864 UART, which provides a

128‑byte FIFO, eight times larger than boards designed with

16C550 compatible parts. The larger buffers allow error free operation even in high‑speed applications. In RS‑485 mode the board provides automatic control of the RS‑485 driver enable for trouble free network master arbitration.

Additionally, RS‑485 network termination, critical to robust multi‑drop communication, can be selectively added to the

circuit via DIP‑switches.

Unique Features

Each port individually congurable for RS‑232, RS‑422,



or RS‑485

16C864 buffered UARTs with 128‑byte FIFOs



Data rates to 921.6K bps



Universal Bus (3.3V and 5V) compatible



Automatic RS‑485 enable/disable



36’ cable terminates to eight DB‑9M connectors



Technical Specications

Number of Ports 8 Communications Chip 16C864

Max Data Rate 921.6K bps

Max Data Distance 4000 feet Operating Temperature 0 ‑ +70° C Storage Temperature ‑50° ‑ +105° C

Humidity Range 10 ‑ 90% R.H.

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