Pag. 10
SM42A / SM82A 2802
3.5.3 Connections for alarm management
See pin configuration table for the DB15 connector.
3.5.3.1 Alarm
contacts
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 contact (alarm relay)
The SM42A / SM82A 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 10 and 11 of
the DB15 connector.
3.5.3.3
External reset
The reset impulse is recognised on the falling or rising edge (which can be set at the matrix programming stage)
Pin 13 of the DB15 connector is associated with External Reset of the alarm condition and the ground reference is
pin 14 (or 9 or 15).
3.5.4 Connecting the matrix to the peripherals
3.5.4.1
Control keyboards (Keyboard lines)
All the keyboards specified in section 2.2
Connectable devices and the SM42A / SM82A video matrix can be
connected by telephone cable using the two 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).
This is not applicable to the previous series keyboards, which require a communication interface because they do
not have RS485 (except for the DCS3 model).
Moreover, the DCTEL and DCBD and Linxs series keyboards can be powered directly by the matrix.
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 configuring the keyboards
Summary:
TYPE OF KEYBOARD
CONNECTION
MAXIMUM DISTANCE
DCJ, DCK, DCTEL, DCBD, DCT,
DCIR
Direct:
RS485
RS485
1200m
Power supply
700m
(1)
LXRPK12, LXRPK23,
LXRPRC36
Direct:
RS485 and Power supply
RS485 1200m
Power supply
700m
DCMT8, SWC4, SWC8, SWC16,
DCS2, KEYPLUS
Connection interface:
RS485 – CURRENT LOOP
CURRENT LOOP
1500m
DCS3
Direct:
RS485
RS485
1200m
(1) Only keyboards DCTEL, DCBD
