Belimo UK24MOD Ürün Bilgileri - Sayfa 9

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UK24MOD
Operation, behaviour
Setting the Modbus baud rate
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Belimo Gateway MP to Modbus RTU
(continued)
The Modbus baud rate is set using the DIP switches under the front cover to the values 9'600,
19'200, 38'400 and 76'800.
The response delay of the device is set to a fixed 4 ms with 9600 Bd. A delay of 2 ms is used as
a default with higher baud rates. A longer delay can be set if needed via register 163.
The RS485 line must be completed at both bus ends with one resistor each. A suitable 150 
element is present in the Gateway which can be switched with DIP switch 1 on the base plate.
The RS485 line can be polarised with two resistors (DIP switches 2 and 3) in order to reduce
interference effects during communications pauses. The biasing is implemented as a rule at one
of the bus ends. Switches 2 and 3 must always be respectively activated or deactivated
together.
The character transmission uses either the settings NO parity (1 start bit, 8 data bits, no parity,
2 stop bits) or EVEN parity (1 start bit, 8 data bits, even parity, 1 stop bit), The setting is done
with DIP switch 4.
Important:
The generally valid guidelines for RS485 / Modbus RTU are to be observed!
T9-UK24MOD • en • v1.7 • 02.2014 • Subject to changes
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