Hach-Lange RTC112 SD-Module - Manual (Page 47)

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Appendix A MODBUS address setting
The same slave address must be set for MODBUS communication on the sc1000
controller display and in the RTC module. Since 20 slave numbers are reserved for
internal purposes, the following numbers are available for assignment:
1, 21, 41, 61, 81, 101…
The start address 41 is preset at the factory.
N O T I C E
If this address is to be or must be changed because, for example, it has already been allocated
for another RTC, the changes must be made both on the sc1000 controller and on the CF card of
the RTC module.
This can only be done by the manufacturer service department (
Section 8 )!