Liquiline CM44x Modbus Guideline V1.0
Hauser
6
© Copyright Dez. 2011
2.2.
Register Addressing
Register
Datatyp
Access
Address range*
Info
Discretes Inputs
Bit
Read only
1XXXX
Not used by device
Coils
Bit
Read / write
2XXXX
Not used by device
Input Register
16-Bit Word Read only
3XXXX
These data can only be read from
the device
Holding Register
16-Bit Word Read / write
4XXXX
These data can be read from the
device and changed by the
application.
* The register address is transferred as 16 bit word where the first register is addressed with the value 0. In this
document the register addresses are given the same way as they are used in the Modbus telegrams.
Hint:
In some Modbus application notes the register addresses are counted starting with 1. In this cases in the Modbus
telegram is transferred the address -1.