Schwank ThermoControl Plus Series CM-485 - Manual (Page 19)

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The following Clock, Time program and Holiday program reading and writing possibility is
available only in controllers produced after 01.05.2008.
Description of Clock (RTC) registers
Address 00F0h 00F2h 00F4h
Hi Lo Hi Lo Hi Lo
Content Hour Minute Month Day Year
Command /
Error
Commands:
22h: Load momentary RTC data into the registers (load as a
snapshot).
41h: Write registers content into RTC (rewrite and save Clock data).
Error: See at chapter “Setting the Clock”
Reading out the Clock in two steps using 22h command:
Load 0022h into register address 00F4h
:020600F40022E2

Read out data from addresses 00F0h – 00F5h :020300F0000308 
The result will contain the snapshot of the momentary Clock data: Hour, Minute, Month,
Day, Year, Error.
:020306090F03130800BF

Hour Error (00h)
Minute Year (08: 2008)
Month
Day
To get actual fresh Clock data repeat the above two steps.
Setting the Clock - example:
Set the following Clock data: Hour:14, Minute:05, Month: 03, Day:22, Year: 2008
Load Hour and Minute into register 00F0h
:020600F00E05F5

Load Month and Day into register 00F2h.
:020600F20316ED

Load Year (08h) and command 41h into register 00F4h :020600F40841BB 
Loading 41h will start the Clock-set procedure.
Then read out data from addresses 00F4h – 00F5h
:020300F40001FE

The result will contain the Year and Error informing about the successful loading.
:0203020800F1
Error information
If the Error is 0 all Clock data is loaded.
Possible Error types and codes are listed here:
In
case of an error all Clock data loading will be
prohibited.
Error Caused by
81h Hour > 23
82h Minute > 59
83h Month > 12
84h Too many Days
85h Year<8, Year>50