2

Genius Bus Connections: Single Bus Cable

To install the Remote I/O Scanner on a single bus cable, use the upper four terminals as described below. Do not use the lower eight terminals.

 

 

 

 

 

a44754

 

 

SER1

1

2

SHIELD

CONNECT

 

IN

 

 

 

 

BUS TO

 

 

 

 

 

TOP FOUR

 

SER2

3

4

SHIELD

TERMINALS

 

OUT

 

 

 

 

 

 

SER1A

5

6

SHIELD

 

R

INÎA

 

 

 

 

 

 

 

 

 

 

E

 

 

 

SHIELD

 

D

SER2A

7

8

NOT USED

U

OUT A

N

 

 

 

 

FOR

 

 

 

 

D

 

 

 

SHIELD

SINGLE±CABLE

A

SER1B

9

10

IN B

BUS

N

 

 

 

C

 

 

 

 

 

 

 

 

 

 

Y

ÓÑSER2B

11

12

SHIELDÑÓ

 

 

OUT B

 

 

 

 

 

1.Connect Serial 1 to the Serial 1 terminals of the previous device and the next device.

2.Connect Serial 2 to the Serial 2 terminals of the previous device and the next device.

3.Connect the Remote I/O Scanner's Shield In terminal to Shield Out of the preceding device. Connect Shield Out to Shield In of the next device. If the Remote I/O Scanner is the first device on the bus, Shield In can be left unconnected. If it is the last device on the bus, Shield Out can be left unconnected. When making bus connections, the maximum exposed length of bare wires should be two inches. For added protection, each shield drain wire should be insulated with spaghetti tubing to prevent the Shield In and Shield Out wires from touching each other, or the signal wires.

Note

The Genius bus connections for the Remote I/O Scanner are not the same as for the Series 90±70 Bus Controller, even though the terminals are physically identical.

SERIES 90±70

 

a44755

GENIUS

 

REMOTE

BUS

 

I/O

CONTROLLER

 

SCANNER

SER1

SER1

SHIELD IN

 

 

SER2

SER2

SHIELD

 

OUT

 

SHIELD

SHIELD

 

IN

 

OUT

 

 

 

Single Bus Termination

If the Scanner is at either end of the bus (electrically), connect a 75, 100, 120, or 150±ohm terminating resistor across the Serial 1 and Serial 2 terminals. Chapter 2 of the Genius I/O System User's Manual lists the correct impedance to use for each approved type of bus cable.

Note

If the module will be powered up when not connected to a properly±ter minated bus, connect a 75±ohm resistor across its Serial 1 and Serial 2 terminals to assure proper powerup.

32

Series 90±70 Remote I/O Scanner User's Manual ± July 1992

Page 38 Page 40
Page 39
Image 39
GE GFK0579B user manual Genius Bus Connections Single Bus Cable, Single Bus Termination
Page 38 Page 40

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