Lufft CHM 15k, User Manual

Page: 32 / 73

Operating Manual CHM 15k R13 / 07-2019
Communication via RS485 & Ethernet 32
Baud rate # Baud rate [bit/s]
(0) (1,200)
(1) (2,400)
2 4,800
3 9,600
4 19,200
5 38,400
6 57,600
7 115,200
Table 6 Correlation between baud rate # and baud rate.
Baud rates 0 and 1 are not specified within the time limit. After sending a set command, the interface is
immediately set to the new baud rate. An incorrectly set baud rate will lead to transmission errors
afterwards and would make a normal reset impossible because of the lack of communication capability.
After expiry of the time interval specified in
TimeOutRS485 (default value: 30 s), the incorrect baud rate
is reset to the baud rate defined in the parameter BaudAfterError . This guarantees that the user can
regain control of the device after this waiting period. The default value of BaudAfterError is 3, which
corresponds to 9,600 bits / second. The default value should be modified by the user, too, in case a baud
rate of e.g. 19,200 is always used.
8.2.4 Restarting the embedded system / resetting to factory settings
The command
set<SPACE><RS485Number>:Reset=1<CR><LF>
instructs the internal processor to perform an immediate restart. This restart takes less than one minute.
Communication with the CHM 15k is not possible during this time; any current automatic telegram output is
also interrupted.
The command
set<SPACE><RS485Number>:ResetSettings=1<CR><LF>
resets all parameters to the factory settings.
The command RSN restarts the network. A restart is always necessary if the network settings, e. g. IP
address, DHCP mode, etc., have been changed. The new network settings are only used after entering the
commands RSN or RST.
set<SPACE><RS485Number>:RSN=1<CR><LF>
8.2.5 Changing time settings
set<SPACE><RS485Number>:dts=30<CR><LF>
The logging and reporting time are set to 30 seconds. The internal measuring time is always set to one
second. The login and reporting time must be a multiple of one second.
The command
set<SPACE><RS485Number>:DateTime=DD.MM.YYYY;hh:mm:ss<CR><LF>
is used to change the date and time of the embedded system.
Here, DD = day, MM = month and YYYY = year, hh = hour, mm = minute and ss = second according to time
zone GMT (Greenwich Mean Time).
Example with RS485Number = 16:
set 16:DateTime=13.04.2006;17:22:46<CR><LF>
sets the date to 13.04.2006 and the time to 17:22:46 GMT.