Instruction Manual

Board Interfaces 45

cPCI-3970

RS-422/485 Adapter Dongle

A DB-9 male-female adapter dongle is provided to allow com-

patibility with common RS-422/485 pin definitions

Table 4-11: RS-422/485 Adapter Dongle Pin Definition

COM1 with RS-422/485 Dongle (DB-9)

NOTE:

The cPCI-3970G/U COM1 RS-422/485 pin definitions are differ-

ent from the common DB-9 pin definitions. An RS-422/485 DB-9

male-female adapter dongle is provided to allow compatibility

with common RS-422/485 pin definitions.

DB-9 (Female)

Signal Name

Pin #

DB-9 (Male)

Signal Name

NC 1 TXD-

RXD- 2 TXD+

TXD- 3 RXD+

NC 4 RXD-

NC 5 NC

NC 6 NC

TXD+ 7 NC

RXD+ 8 NC

NC 9 NC

Pin # RS-422 RS-485

1 TXD- TXD-

2 TXD+ TXD+

3RXD+ —

4RXD- —

5— —

6— —

7— —

8— —

9— —