CDX800 DESCRIPTION
As well as the other signals, DSR values are accessible within the CIO communication
reports (see the ARNEP protocol description).
3.4. Output signal for disconnection of supply voltage
The only exclusively "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, similarly to I/O outputs.
3.5. Technical parameters
Number of I/O signals on I/O port
5
Basic range of the analogue input supply voltage
0 to 5V
Maximum switched current of binary output
500 mA
Maximum switched voltage of binary output
30 V
3.6. 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 connect electric circuits before I/O signals that will adjust the values measured to a voltage
within the 0 to 5 V range and, at the same time, protect the inputs from interference and over-
voltage. 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 CDX 800 supply voltage.
Supplementary CIO modules are designed for practical I/O signal use, establishing
an interface between the user device and I/O signals.
Name
Type
Description
CIO ANI 2
Analogue
input
Analogue differential input for small voltage, current and resistance
measuring. It includes differential amplifier with adjustable power 1 to
10000. Precision source of current ranging from 0.1 to 3 mA can be
used to measure resistance. Configuration of the input signals,
amplification and current source is carried out through resistance net.
Presence of the input signal relevant to A/D converter working range
is signalled by LED on the front panel. Input circuits are protected
against short-time over-voltage by suppressors and against the long-
time one by a reverse fuse.
Ranges of the measured values:
U 1V, U 2V, U 5V, U 10V, U 20V
I 5mA, I 10mA, I 20mA
Pt100 100
o
C, Pt100 200
o
C, Pt100 500
o
C
Resistance 100 to 50000 Ohm (METRA transmitter)
CIO OPI 2
Binary
One galvanic separate digital input for AC/DC signals up to 30 V,
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