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Echnical, Escription – Impulse 7804e User Manual

Page 18

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©Sealevel Systems, Inc.
SL9219 - 06/2011

7804e Manual

18

The Ultra COMM+8.PCIe provides eight RS-232/422/485 ports from a single PCIe slot.

The Ultra COMM+8.PCIe utilizes the 16C950 UART. This chip features programmable baud
rates, data format, interrupt control and industry leading 128-byte transmit and receive FIFOs.

The UARTs are register compatible with 16C450, 16C550, 16C654 and 16C750 UARTs. The
FIFO depth can be changed to match the depth of these UARTs.

Signal

Name

Pin #

Mode

GND

Ground

5

TX +

Transmit Data Positive

4

Output

TX-

Transmit Data Negative

3

Output

RTS+

Request To Send Positive

6

Output

RTS-

Request To Send Negative

7

Output

RX+

Receive Data Positive

1

Input

RX-

Receive Data Negative

2

Input

CTS+

Clear To Send Positive

9

Input

CTS-

Clear To Send Negative

8

Input