105U-G Wireless Gateway
User Manual
Page
27
©
August 2003
3.3.3
Solar Supply
A 12V solar panel (up to 30W) can be connected directly to the 105G as a DC power supply
and the 105G will charge a battery. The 105G will charge the battery at 1.5A maximum.
A 105G can be powered from a solar supply using an external regulator. If a 12V solar
supply is used, the 12V battery can be connected to the battery supply connections of the
105G and the 105G will monitor for low battery status and also battery voltage. If a 24V
solar supply is used, the 24V battery should be connected as a DC supply (SUP1 and GND) -
the supply voltage can be monitored however the “supply fail” voltage will activate too low to
be used as a battery fail status.
3.4
Input / Output
The 105G has eight on-board discrete/digital I/O. These act as both discrete inputs and
discrete outputs.
3.4.1
Digital Inputs / Outputs
All eight of the 105G DIO terminals may be used as discrete inputs. These inputs are
suitable for voltage free contacts (such as mechanical switches) or NPN transistor devices
(such as electronic proximity switches). PNP transistor devices are not suitable. Contact
wetting current of approximately 5mA is provided to maintain reliable operation of driving
relays.
Each digital input is connected between the appropriate "DIO" terminal and common
"COM". Each digital
input circuit includes a
LED indicator which is
lit when the digital
input is active, that is,
when the input circuit is
closed. Provided the
resistance of the
switching device is less
than 200 ohms, the
device will be able to
activate the digital
input.
All eight of the 105G DIO terminals may also be used as discrete outputs. The digital outputs
are transistor switched DC signals, FET output to common rated at 30VDC 500 mA.
Digital outputs may be configured to individually turn off if no command message is received
to that output for a certain period. This feature provides an intelligent watch dog for each
output, so that a communications failure at a transmitting site causes the output to revert to a
known state. See Chapter 4
Configuration
for further details.
DIO 1
DIO 1
