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17
ENG
Use the following key combination to activate the Modbus protocol or to change the interface
(RS-485 <-> Modbus):
1)
Long-press key "B" to enter the service mode, LED 5 lights up light blue
2
) Now press key "A" briefly several times to select the interface:
1 = RS-485
2 = Modbus as server (default setting)
3 = Modbus as client
Then, for example, only LED 2 is still lit (of the 4 available LEDs 1-4).
3)
Long-press key "B" (to enter run mode), this saves the setting
and LED 5 lights up green again (or red if there is an error condition).
4)
The controller must be switched off and on again to activate the Modbus protocol.
Note (for system integrators) on the Modbus client on PC:
The program Flamco used to test the Modbus functionality is ModbusClientX
https://sourceforge.net/projects/modbusclientx-modbus-tool/
7.2.3 RS-485 interface settings (notes for system integrators)
The
factory settings
of the Modbus interface are set to (8, N, 1, 9600Baud) by default:
•
8 data bits
•
No parity bit
•
1 start bit/1 stop bit
•
Baud rate = 9600 bits/s
It is possible to preset the settings ex works to suit interface requirements.
7.2.4 Example of a broadcast message (notes for system integrators)
The external (outside) temperature can be transmitted via Modbus from a client to any LogoTronic
controller for electronically controlled interface stations (HIU) as a server. The easiest way is to
send the broadcast command to register 45002. The outside temperature should be written at least
every 10 minutes. The HIU controllers will invalidate the outside temperature value after 15 minutes
without new data and reset it to the default value (-10°C).
The following example shows a complete telegram for a Modbus broadcast at address 0 for register
45002.
