CIO DESCRIPTION
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5.2.3 Measuring DSR output signal level
DSR signals on separate user interfaces are output signals from CGU 04i viewpoint.
They are not controlled form the inside. Individual signals are linked through 330 Ohm
resistors.
By placing 100 Ohm ground resistor on DSR output the voltage will fall to 1 V.
Following this fall CGU 04i will recognize the connection of the service cable and will start to
communicate on this user interface via ARNEP protocol with defined communication
parameters. It is not allowed to load the output to a level when voltage falls below 3 V.
As well as the other signals, DSR values are accessible within CIO communication
reports (see ARNEP protocol description).
Signal
name
Measuring
range [V]
Resolution
[bit]
Sampling
[ms]
Average
from
samples
Hysteresis
Control level
DSR1
0 to 20
10
100
Optional
Optional
Optional
DSR2
0 to 20
10
100
Optional
Optional
Optional
5.3. Output signal for disconnection of supply voltage
The only single-output signal is PWRSV (Power Save). The signal is linked
to the supply connector (see the supply connector description). It is connected as universal I/O
signal outputs. This is an open collector that switches PWRSV signal to the ground (GND).
The output is controlled by a report similar to I/O outputs.
5.4. Technical parameters
Number of I/O signals on I/O connector
5
Basic range of the analogue input supply voltage
0 to 5 V
Maximum switching current of the binary output
500 mA
Maximum switched voltage of the binary output
30 V
5.5. Connecting CIO signals to user device
It is not appropriate and often even possible to connect I/O interface signals directly to
the user device. In order to measure currents, resistance and large voltage it is necessary to
mount series of circuits before I/O signals that will adjust the values measured to a voltage
within 0 to 5 V range and at the same time protect the inputs from interference
and overvoltage. Similarly serial electric circuits should be mounted to control power parts
of the user device, as the transistor with open collector is able to switch current up to 500 mA
and voltage up to the value of CGU 04i supply voltage.
Supplementary CIO modules are designed for practical I/O signal use, establishing
an interface between the user device and I/O signals.
