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SETECNA
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Rev. 01
Alessandro
Page: 5 di 10
14/09/2016
23/09/16 17.56
Gateway MODBUS-to-Opentherm MB-OTG
Technical manual
3
Integration
The protocol is MODbus RTU over Serial Line, (EIA-485).
3.1
Communication to the MODBUS, Parameter setting
The communication parameters changes according to the position assumed by the rotative switch with 16
positions on the device.
The rotary switch is placed under the plastic case: to open it, you have to apply a light pressure with a small
flat blade screwdriver at the sides of the device.
It allows to set the communication parameters (Baud Rate and Parity) and the address assigned to the
device, according to the following table:
Switch
Position
Communication
Parameters
MODBUS
Address
0
9600 baud,
None Parity
9600,N,8,1
16
1
17
2
18
3
19
4
20
5
21
6
22
7
23
8
19200 baud,
Even Parity,
19200,E,8,1
16
9
17
A
18
B
19
C
20
D
21
E
22
F
23
Note that selector’s changing is immediately recognized, there is no need to power cycle the device.
Select MODbus address and
communication parameters
Led O/T
(orange)
Led BUS
(green)
