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e)
Verify ALL other valves are open.
Keep the ALARM RESET button pressed and press and
release the PUSH button leaving two seconds pause
between pressing and releasing action until when the
pressure indicated on the cylinder manometer reaches the
following values:
•
14 bar (203 psi) for Dosaodor-D systems
•
38 bar (551.2 psi) for Dosaodor-D/AP systems (High
Pressure)
Verify during the operation no gas leaks from the relief valve
(key 11) draining silencer. Should this happen, increase the
triggering values as described hereunder.
After reaching the required calibration pressure, proceed as
follows:
a)
Remove the draining silencer located on the outlet side
of the relief valve (key 11).
b)
Insert a wrench for 3 mm hexagonal cap screws into the
gas exhaust hole until the regulation plate is reached.
c)
Rotate counter clockwise the regulation plate until the
gas starts to evacuate.
d)
Mount back the silencer on the relief valve.
e)
Open all the system valves.
f)
Set the key switch to PROGRAMMING– ON.
g)
Set the selector switch to AUTOMATIC.
h)
Press the ALARM RESET button.
i)
Set the key switch to PROGRAMMING - OFF.
ACTIVATION OF THE MODBUS
COMMUNICATION PROTOCOL ON THE
ELECTRONIC CONTROL UNIT
This technical note describes the procedures to adopt to acti-
vate and configure the MODBUS communication protocol on
the serial port/s on the Dosaodor-D Electronic Control Unit.
installed with control Software Rev. 3.00 or equivalent.
The MODBUS communication can be activated both on the
PIN on DB‑9 MALE
2
3
4
5
Communication Port positioned on the Front of the ECU
(COM Port 1) or on the internal one which is normally dedi-
cated to the connection of an external RTU (COM Port 2).
In order to perform the operations for the configuration, it is
necessary to have the following material:
•
•
•
•
In order to activate the MODBUS communication on the
DOSAODOR-D ECU. 1 follow the steps below:
a)
b)
c)
d)
e)
Table 2. Signals Used
Function / Notes
Tx
Rx
DTR
Ground Signal
The remaining signals ARE NOT used
Personal Computer, preferably LAPTOP working with
Windows XP, Windows 7, Windows 8.1, Windows 10
operating system equipped with Serial Port RS-232 or
adapter USB/RS-232.
DosaLink Communication/Configuration software for
odorization systems.
Serial cable 9 Poles Male/Female with "Straight" execu-
tion (NOT crossed). The "Straight" cable is a cable
whose connections are NOT crossed, the signals used
in the communication between the PC and the ECU are
outlined in Table 1.
Screwdriver with appropriate point to remove the screws
to blocking the metal protection of the electronic board
for connecting the signal cables. (Terminal block board
placed at the bottom of the cabinet containing the ECU).
Activate of the Default communication parameters
on the Front Serial Port of the ECU (Dip Switch 4 in
OFF position) –> DosaLink Protocol, Communication
Parameters 19200,N,8,1 to allow the serial connection
with DosaLink software.
Connect the "Straight" Serial Cable between the ECU
(COM Port 1) and the PC Serial Port.
Startup and Configuration the DosaLink Software.
Define the Serial Port of the ECU on which the
MODBUS Communication is activated.
Define the MODBUS Communication parameters.
PIN on DB‑9 FEMALE
Dosaodor-D
2
3
4
5
37
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