Mesa 7I44 User Manual

7I44 MANUAL

8 CHANNEL RS-422 INTERFACE

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Table of Contents

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

HARDWARE CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

DEFAULT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CABLE POWER SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CONNECTOR LOCATIONS AND DEFAULT JUMPERS . . . . . . . . . . . . . . . . . 3

CONTROLLER CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

AUX 5V POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

RJ-45 CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

OPERATION

5V POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

RS-485 CAPABLE CHANNELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

INTERFACING WITH MESA SERIAL DEVICES . . . . . . . . . . . . . . . . . . . . . . . 6

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7I44 1

GENERAL

DESCRIPTION

The 7I44 is a 8 channel RS-422/RS-485 interface for Mesa s Anything I/O series of
FPGA interface cards.The 7I44 has 8 independent receive and transmit channels. Each
transmit channel has a independent drive enable for bus or 2 wire half duplex systems.

The controller connection is a 50 pin header that matches the pinout of the 4I34M,
4I38, 4I65, 4I68, 5I20, 5I22, 5I23, 7I43 and 7I60 Anything I/O cards. Serial I/O connectors
are RJ45 jacks allowing standard CAT5 cables to be used for high speed serial links. The
7I44 also supplies 5V power on the RJ 45 connectors. PTC devices limit maximum 5V
current to 1A .

The RJ45 serial interface pinout used is compatible with all of Mesa’s serially
connected amplifiers and all serially interfaced I/O cards.