16
DRR450 - User manual
coo.f.
Cooling fluid
type
p.b.m.
co.c.t.
Air
Air
1.00
10
oiL
Oil
1.25
4
H2o
Water
2.50
2
Once selected the parameter
coo.f.
, parameters
p.b.m.
,
ou.d.b
and
co.c.t.
can however be modified.
7
Serial communication
DRR450-12A-T is equipped with RS485 and can receive/
broadcast data via serial communication using MODBUS RTU
protocol.
The device can only be configured as a Slave.
This function enables the control of multiple controllers
connected to a supervisory system/SCADA.
If contacts of dip-switch are all open each controller responds
to a Master query only if the query contains the same address
as parameter 29
SL.a.d.
The addresses permitted range from 1 to 254 and there must
not be controllers with the same address on the same line.
Address 255 can be used by the Master to communicate with
all the connected equipment (broadcast mode), while with
0 all the devices receive the command, but no response is
expected.
DRR450 can introduce a delay (in milliseconds) of the
response to the master request. This delay must be set on
parameter 32
Se.de.
Each parameter modification is saved by the controller in
the EEPROM memory (100000 writing cycles), while the
setpoints are saved with a delay of 10 seconds after the last
modification.
NB
: Changes made to words that are different from those
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