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Impulse 7204 User Manual

Page 15

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Technical

Description

Sealevel Systems ULTRA 485+2.PCI Page

12

Connector Pin Assignments
RS-422/485

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

Technical Note

: Please terminate any control signals that are not going to be used. The most

common way to do this is connect RTS+ to CTS+ and RTS- to CTS-. Terminating these pins, if
not used, will help insure you get the best performance from your adapter.