Opto 22 Rack Configuration
VL-486-4 Reference Manual
Configuration – 29
Opto 22 Rack Configuration
The VL-486-4 card has 16 digital I/O lines that can be independently programmed as inputs or
outputs. The I/O connector is compatible with 8 and 16 position modular I/O racks.
R
ACK
P
OWER
C
ONTROL
The VL-486-4 board includes provisions for powering the external I/O rack assembly with +5
volts at 500 ma.
When Jumper V1 is installed, the I/O rack power line (I/O rack pin 49) is connected to +5 volts
on the STD Bus through a 1 Amp self resetting polyfuse. If the I/O rack is powered by a separate
external supply, either a jumper from the I/O rack or the V1 jumper must be removed.
Note
The +5 volt power output from the VL-486-4 can be shorted to ground if the
connector is not correctly oriented at either end of the interface cable. The use of
keys in the connectors, or very clear markings are recommended to prevent
backwards connection of the cable.
Table 10: Rack Power Configuration Jumper
Jumper
Block
Description
As
Shipped
V1
Opto 22 I/O Rack Power
In
— I/O rack power provided locally
Out
— I/O rack power provided externally
Out
