Some usage scenarios of the microSpider2 I/O connectors are outlined below:
1.
Using the connectors provided, connect Inputs as per manual
a.
Switch, counter, quadrature and tamper inputs - connected
directly to appropriate input and
GROUND.
b.
4-20mA – connect directly between an available analogue input and GROUND.
External resistors are NOT required
c.
Voltage inputs with a range of up to 2.4V – connected directly between an available
analogue input and GROUND
d.
Voltage inputs with a range over 2.4V – connected via dividing resistors (not supplied – see
the manual for details)
2.
“SWITCHED POWER OUT” can be used to power sensors from an external battery or power supply
connected to “EXTERNAL POWER IN”. The microSpider2 will switch the power to the sensor when
required.
3.
“OPEN COLLECTOR OUTPUT” can be used to control external devices such as samplers and power
supplies. When activated, this output will create a connection to GROUND through a 440 Ohm
resistor.
4.
“INTERNAL LOW VOLTAGE SENSOR POWER SUPPLY” can be used to power low power sensors
directly from the microSpider2. This output is user settable as either 3.3V or 5V and is current
limited to approximately 100mA. Please note that using this power supply will increase the system
power consumption, reducing the battery life.