&MGPEVDU.5
Serial terminations
The termination is necessary to prevent or attenuate the interferences
on the signal.
Perform it by inserting a 120 ohm resistor on the end line, connected
parallelly, or by S1 on the serial card on the unit at the end of the line.
Thermostat for terminal units
The thermostats of the terminal units type are not a part of the network.
Therefore, they must be connected directly to the terminal unit itself,
follow the instructions in the electrical diagram provided.
Until the serial line is active, the units with no thermostat will operate by
reading the temperature via the intake probe. However, it will not be
possible to take any actions or make any modifications.
C O N F I G U R AT I O N AN D O P E R AT I N G
The mini-network is made up of a Master unit (P40=1) typically
connected to a thermostat and 1 or more slave units (P40=0).
The slave units operate, as when they are under supervision;
therefore, they follow the flag register logic. Also, the network
disconnection management (master does not speak) is the same.
All slave units must have a P33 Index parameter different than zero
(the address does not need to be different). The Master unit has no
constraint on the Index parameter value.
All units must have congruent communication parameters (Baudrate
and parity).
CONTROL
The controls from the Master units by the thermostat are sent to the
other slave units of the network.
If the master unit is configured to use an inlet probe, even the slave
units will use their probe; if the master unit is configured to use the
value detected by the thermostat, the value will be passed along the
network to the slave units. Each slave unit will operate always with its
own water probe.
If the keyboard is present on the slave units, it will have the function of
displaying and no control will be active.
if the master unit is equipped with a thermostat and a keyboard, the
keyboard will be used only as a displayer.
CHANGE TO AUTOMATIC MODE
The change of mode is decided by the Master unit, both in 2 or 4 tubes
using the stand-alone criteria.
The slave units can be kept configured for the change in non automatic
mode; the master unit will decide the mode and will transmit it to the
slave units as a network value priority on the local one.
The slave units that wait to know the new mode from the master unit
remain in the previous mode, particularly in the two following cases:
•
master unit with under process change-over.
•
master unit in water alarm.
Alarms
The alarm displayed on the thermostat is relevant only to the master
unit; if the unit is stopped for an alarm (for example out of range), the
slave unit operation is not compromised.
The slave units will display their alarm if they are equipped with a
keyboard.
Stata and parameters
The status and the parameters displayed by the thermostat are
relevant to the Master unit.
The slave units will display their status and parameters only if they are
equipped with a keyboard.
DIGITAL INPUTS
The digital inputs can be configured only for the following :
•
ON-OFF the event will concern the relevant unit or all the network
in the event of the master
•
ALARM only the unit relevant to the alarm will be concerned
NETWORK INTERRUPTION, MASTER FAILURE
When the network is not present, the units operate in stand-alone
mode with the settings on the local setting register; if the auto mode
has been set locally, when the units are in stand-alone , they will
automatically decide the mode provided and always that they are
equipped with an air probe.
OPERATIONS DETAILS AS MASTER UNIT DETAILS
The network master unit broadcasts all controls. The network master
unit does not ask information to the slave units (no polling).
The network master unit sends the start up and then, once a minute,
sends the setting of the flag register with the following information:
Ind. Modbus
Par
Description
range
UM
def
notes
1032
032
Index:
Switch address
0…127
Num
0
1033
033
BaudRate
0=4800 1:9600 2:19200
0 … 1
flag
1
034
1034
Parity
(0=no, 1=ODD, 2=Even)
0 …1
flag
0
1039
039
Master:
Enabling to mininetwork master unit (only for
Room and Space)
0…1 num 0
0: Slave
1: Mininetwork Master
Baudrate
Parity
Databit
Stopbit
Read function
Write function
4800 - 9600
none - even - odd
8
1
03, 04
06, 16
ara
parametro
note
m
e
EnSetpointRete
n
EnModoRete
EnSetUrRete
1
only for Space
R
EnStatoRete
EnFanRete
n
EnSondaUmiditaRete
1
only for Space
EnSondaAriaRete
R
If the master uses as control probe
the probe on board
1
if the master unit uses the thermo-
stat probe (therefore, the master
acts as a repeater of this value
EnSondaAcquaRete
EnSondaExtRete
et
only Space
The network master unit broadcasts the following information relevant to
the supervisor’s area to all slave units every second:
Bitmap Remote Mode
UrRemota (only Space, repetition of the thermostat UR probe)
SetHeatRemoto
SetCoolRemoto
Remote air temperature (if EnSondaAriaRete=1)
FanRete
Содержание ELFODuct MP 15
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