Hach-Lange WTOS P-RTC - Manual (Page 47)

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Appendix A MODBUS address setting
The same slave address for MODBUS communication must be set on both the sc1000
display and on the RTC101 P-Module. As 20 slave addresses are reserved for internal
purposes, the following slave addresses are available for assignment:
1, 21, 41, 61, 81, 101 etc.
Slave address 41 is preset at the factory.
N O T I C E
If this slave address is must be changed because, for example, it is already assigned to another
RTC module , it must be edited on both the sc1000 and on the CF card of the RTC module.
This can only be done by the manufacturer service department (
Section 8 )!