Pixsys ATR 142 Series, User Manual

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User manual - ATR 142 31
t.1.2.w.
Timer 1-2 Warning
expiring
Alarm active for the last 5” of Timers 1
and 2.
9
Serial Communication
9.1
Slave
ATR142-ABC-T is equipped with RS485, it can receive and
broadcast data via serial communication using MODBUS RTU
protocol. The device operates as slave if parameter 59
mast.
is
set as
dis
. This function enables the control of multiple devices
connected to a supervisory system (SCADA).
Each controller will answer to a master query only if the query
contains same address as on parameter
sL.ad.
The permitted
addresses range from 1 to 254 and there should not be control-
lers 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 answer is expected.
ATR142 can introduce an answer delay (in milliseconds) to ma-
ster request. This delay has to be set on parameter 58
se.de.
At each parameter configuration, the device stores changed
values in the EEPROM memory (100000 writing cycles), while
setpoints are stored with a delay of 10 seconds after last
modification.
NB : modifications made to words different from
those described in the following table can lead to instrument
malfunction.