Direct Digital Controller
80 Direct Digital Controller fw 4.013 – Ed. 01/2013
The default value is 1 and usually it doesn't need changing, except for links with bus RS-485 instead of RS-
232 In case of bus RS-485, in fact, there can be more DDC’s linked on the same bus and, to address them,
different addresses shall be set. In case of bus RS-232 only one DDC can be linked to the Master modbus,
therefore the default value can be left.
The address can be set with values from 1 to 247.
1 - Select
from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - Enter the installer password on the numerical keypad that appears on the display.
4 - From the drop-down menu select “DDC”.
5 - Turn the knob to scroll the cursor downward until highlighting “Modbus addr. Setup” and press the knob
to gain access to the screen.
6 - Select the desired address.
4.4.1.15 Com Modbus parameters
This option permits to set the parameters of the Modbus communication.
In particular, communication speed, number of data bits, stop bits and parity check can be set. The choice is
limited to 6 possible combinations:
a) 19.200 baud, 8 data bits, 1 stop bit, no parity (9600 8N1)
b) 19.200 baud, 8 data bits, 1 stop bit, pair parity (9600 8E1)
c) 19.200 baud, 8 data bits, 2 stop bits, no parity (9600 8N2) (not available on RS-485)
d) 9.600 baud, 8 data bits, 1 stop bit, no parity (9600 8N1)
e) 9.600 baud, 8 data bits, 1 stop bit, pair parity (9600 8E1)
f) 9.600 baud, 8 data bits, 2 stop bits, no parity (9600 8N2) (not available on RS-485)
Choose the desired combination, that must correspond to the setting on the Master Modbus device connected
to the DDC.
1 - Select
from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - Enter the installer password on the numerical keypad that appears on the display.
4 - From the drop-down menu select “DDC”.
5 - Turn the knob to scroll the cursor downwards until “Modbus.Com. Param.” is selected, and press the
knob to access the screen.
6 - Select the desired communication parameters.
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