GE GFK0579B User Manual
2
Series 90–70 Remote I/O Scanner User’s Manual – July 1992
32
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.
described below. Do not use the lower eight terminals.
5
6
3
1
7
9
11
4
2
8
10
12
ÑÑ
ÑÑ
ÑÑ
ÑÑ
ÓÓ
ÓÓ
ÓÓ
ÓÓ
R
E
D
U
N
D
A
N
C
Y
E
D
U
N
D
A
N
C
Y
SER1
ÎÎ
ÎÎ
SER1A
ÎÎ
SER2A
ÎÎ
ÎÎ
SER1B
ÎÎ
SER2B
a44754
ÓÓÓ
ÓÓÓ
ÓÓÓ
ÓÓÓ
ÑÑÑ
ÑÑÑ
ÑÑÑ
ÑÑÑ
ÎÎÎ
ÎÎÎ
ÎÎÎ
SHIELD
OUT B
ÎÎÎ
ÎÎÎ
SHIELD
IN B
ÎÎÎ
ÎÎÎ
ÎÎÎ
SHIELD
OUT A
ÎÎÎ
ÎÎÎ
SHIELD
IN A
SHIELD
IN
SHIELD
OUT
SER2
NOT USED
FOR
SINGLE–CABLE
BUS
CONNECT
BUS TO
TOP FOUR
TERMINALS
1.
Connect Serial 1 to the Serial 1 terminals of the previous device and the next
device.
device.
2.
Connect Serial 2 to the Serial 2 terminals of the previous device and the next
device.
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.
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.
same as for the Series 90–70 Bus Controller, even though the
terminals are physically identical.
SHIELD
OUT
a44755
SER1
SER1
SER2
SER2
SHIELD IN
SERIES 90–70
GENIUS
BUS
CONTROLLER
REMOTE
I/O
SCANNER
SHIELD
OUT
SHIELD
IN
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.
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.
properly–ter minated bus, connect a 75–ohm resistor across its Serial 1
and Serial 2 terminals to assure proper powerup.