User manual

The software allows the polarity of the input(s) or output to be programmed.
When using the test menus 5514 and 5524 the physical levels are referred to,
whereas the remote status command returns the logical condition as defined by
the programmed polarity. For example you may configure input 1 to be active
low and input 2 to be active high above a 2.5v threshold. In this case Input 1 will
show TRUE when low and Input 2 will show TRUE when high. Note that Input 2
can be considered as logic input if the threshold is set at the default of 2.5v.
Tip: If you wanted to send an SMS to two different locations for a single event,
you could connect both inputs together but have different numbers set for each.
Tip: If you only want to monitor the supply voltage, enable Input 1 “Active low”
but do not connect anything to it. The input will remain high so configure Input1
to be “Normally open”. The Input event will never become true, but the battery
monitor will send an alert to the number allocated to Input 1.
Input/Output settings (press 0# followed by 55)
The input and output capability usefully exploits the ability of the terminal to
send and receive SMS. Two channels are provided. Channel 1 is a logic level
input or output. Channel 2 is analogue input only and can be set to trigger at a
certain voltage threshold (see page 26).
Channel 1 (input or output)
Polarity (press 0# followed by 5511)
Use this to select if this is to be normally closed or normally open. This level
selection applies to either the input or output mode whichever is selected.
Input or Output selection (press 0# followed by 5512)
Use to set channel 1 to an input or an output.
Text to send (press 0# followed by 5513)
This uses the normal SMS editing method to create a message and number to
call when the input condition it met.
Test connection (press 0# followed by 5514)
This displays the input condition or allows the output to be toggled to test the
connection.
By simply connecting a switch of almost any kind including a magnetic door switch,
float switch and so on, it is possible to create a very effective monitoring system.
There are two connections, 1 and 2. Connection 1 can be configured as either an input
or output by the settings menu 5512 (see page 25) Connection 2 is an input only.
Connections are made via a 3.5mm “stereo” style jack plug, which is supplied.
Connection 1 (jack tip) when used as an input responds to two conditions, high or low.
When used as an output, it is a so called “open collector” type which is suitable for
providing a logic signal or driving a low power relay coil with an external power source
and suitable external back emf protection diode.
Connection 2 (jack ring) is an analogue input, which responds to a voltage level. The
software in the terminal provides 9 levels of monitoring at 0.5 volts steps providing
levels of between 0.5 volts and 4.5 volts.
Both inputs are heavily filtered to protect internal components from damage due to
voltage spikes or interference.
Section 17
Using the inputs
or output
24 25
Section 17
Using the inputs
or outputs
Figure 6: Input/output interface circuit