© 2020 Weinzierl Engineering GmbH
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Depending on the parameter
Datapoint type N
various channel functions are possible, which will
be discussed in more detail in the following chapters.
For
“Value in word register” it should be noted that the channel does not work in case of incorrect
configuration.
The Bit count and Offset together must not be greater than 16.
The value must fit into Bit count, for example Bit count = 1
→
“Value” = 0 or 1.
Function
The Modbus function code for this channel is configured here.
Different function codes can be configured depending on
KNX gateway
(Modbus master/slave),
Direction
and
Type
.
Word register:
Modbus Master | KNX to Modbus
▪
Write single holding register
– 06
▪
Write multi holding registers
– 16
(for
“DPT 14” and “Double word register”)
Modbus Master | Modbus to KNX
▪
Read holding registers
– 03
▪
Read input registers
– 04
Modbus Slave | KNX to Modbus
▪
Read holding registers
– 03
▪
Read input registers
– 04
Modbus Slave | Modbus to KNX
▪
Write single/multi holding registers
– 06, 16
Bit Register:
Modbus Master | KNX to Modbus
▪
Write single coil
– 05
Modbus Master | Modbus to KNX
▪
Read coils
– 01
▪
Read discrete inputs
– 02
Modbus Slave | KNX to Modbus
▪
Read coils
– 01
▪
Read discrete inputs
– 02
Modbus Slave | Modbus to KNX
▪
Write single/multi coils
– 05, 15
