SMS Lite 4G
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User Guide
© 2022 QTech Data Systems Ltd
7
Inputs
The SMS Lite inputs are to be connected to switches or mechanical contacts.
The default input names are: INP1, INP2, INP3, INP4, which can be renamed.
An input is active or ON when the input switch is closed and
inactive or OFF when the input switch is open.
Close the
switch contact to turn “INP1” “ON”
.
Warning
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Only mechanical switches or mechanical closure devices should be
connected to the inputs. DO NOT connect external voltage or other electrical
source to the inputs.
Output Relays
The output relays are normally open devices with a maximum rating of 32V DC at a current of 2A.
The relays can switch DC low voltage, low current devices directly.
However, we recommend using interface relays as they improve future serviceability and are required
or higher voltages or currents.
The relays are internally protected by solid state snubbers for operating with inductive loads.
The default output relay names are: RLY1, RLY2, RLY3, RLY41, which can be renamed.
The output relays are normally open contacts.
Send “ON” command to close “RLY1”
operating light.
Warning
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DO NOT directly connect to 220V AC voltage. The New Zealand and
Australian wiring regulations require that any wiring in excess of 32 volts must be
carried out or be certified by a registered electrician. Consult your local electrical
installer for further guidance.
DC Power Supply
Connect a suitable 12-24V
DC power supply to the 2.1mm socket labelled “12V DC”.
QTech recommends plug pack P/N PD5412 or power supplies PD5413 & PD5414.
Warning
–
DO NOT use Switch Mode Power Supplies (SMPS) with this
product. The DC power supply used for this product MUST have a grounded
negative or be a “linear” transformer
-based plug pack. The reason is that the
antenna, programming port and external connections can provide exposed earth
points and the SMPS can impose an AC voltage on the DC ground, which can lead
to damage.