Pag. 11
MNNAEKR_0408
3.5.3 Connection s for alarm management
See pin configuration table for the DB25 connector.
3.5.3.1 Alarm contac ts
WARNING! Do not energise the alarm contacts! The sensors (or the alarm system in use) should supply
a dry contact. To manage the alarms correctly, be very careful when configuring the alarm parameters at the
matrix programming stage.
3.5.3.2 Auxiliary con tact (alarm relay)
The EKR-8/4 / EKR-16/4 matrix can be used to control an auxiliary contact (relay) that is activated when there is
an alarm, if properly configured at the matrix programming stage. The auxiliary relay contacts are at pins 21 and
22 of the DB25 connector.
3.5.3.3 External rese t
The reset impulse is recognised on the falling or rising edge (which can be set at the matrix programming
stage).
Pin 17 of the DB25 connector is associated with External Reset of the alarm condition and the ground reference
is pin 18.
3.5.4 Connecting the matrix to the peripherals
3.5.4.1 Control keybo ards (Keyboard lines)
All the keyboards specified in section 2.2
Connectable devices
and the EKR-8/4 / EKR-16/4 video matrix can be
connected by telephone cable using the 4 RJ-11 sockets called KEYBOARDS.
They can be connected directly using the 1.5m cable (supplied with the control keyboards) for short distances,
or, for longer distances, using the RJ-jack wall-mounted boxes (supplied with the control keyboards).
All the keyboards should have transmission rate settings that are compatible with the settings made for the
matrix at the programming stage. See the respective manuals for the keyboard setup.
Connecting RS 485 KEYBOARD lines
MATRIX
RJ-jack 1
RJ-jack 2
KEYBOARDS
RS485-A
Blue
-----------------
White
RS485-A
RS485-B
Black
-----------------
Yellow
RS485-B
12 VDC
Red
GND
Green
3.5.4.2 Telemetry rec eivers (AUX line)
All the receivers specified in section 2.2
Connectable devices
and the EKR-8/4 / EKR-16/4 video matrix can be
connected by telephone cable using the RJ-11 socket called AUX.
They can be connected directly using the 1.5m cable (supplied by the manufacturer) for a test or, for longer
distances, using the RJ-jack wall-mounted boxes (supplied by the manufacturer) and referring to the following
table:
RS 485 matrix (AUX line) – Receiver connection
MATRIX
RJ-jack 1
RJ-jack 2
RECEIVER
RS485-A
White
-----------------
Blue
RS485-A
RS485-B
Yellow
-----------------
Black
RS485-B
All the receivers should be set up for RS485 communication mode and with a transmission rate that is
compatible with the setting made for the matrix at the programming stage.
See the respective manuals for configuring the receivers.
There are two possible ways of connecting the receivers to the AUX line:
•
Receivers in cascade (Point-to-point connection)
•
Receivers on the same line (Multi-point connection)
