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Technical description – Impulse 7105 User Manual

Page 9

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Technical Description

Sealevel Systems ULTRA 485.PCI Page

9

Technical Description

The Sealevel Systems ULTRA 485.PCI provides an additional asynchronous serial port, field selectable as
RS-422/485/530 for industrial automation and control applications.

The ULTRA 485.PCI utilizes the EXAR 16C850 UART. This chip features programmable baud rates, data format,
interrupt control and an industry leading 128 byte FIFOs.

Connector Pin Assignments

RS-422/485/530 Pin Assignments (DB-25 Male DTE)

Signal

Name

Pin

# Mode

GND

Ground

7

RDB

RX+

Receive Positive

16

Input

RDA

RX-

Receive Negative

3

Input

CTSB

CTS+

Clear To Send Positive

13

Input

CTSA

CTS-

Clear To Send Negative

5

Input

TDB

TX+

Transmit Positive

14

Output

TDA

TX-

Transmit Negative

2

Output

RTSB

RTS+

Request To Send Positive

19

Output

RTSA

RTS-

Request To Send Negative

4

Output


Note:
These assignments meet the EIA/TIA/ANSI-530 DTE.