JULABO FL601 Recirculating Coolers - Manual (Page 39)

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Important times for a command transmission:

To ensure a safe data transfer, the time gap between two commands should
be at least 250 ms.
The recirculating cooler automatically responds to an in command with a data
string followed by a LF (Line Feed). The next command should only be sent
after 10 ms.
The commands are divided into in or out commands.
in commands: asking for parameters to be displayed
out commands: setting parameters

The out commands are valid only in remote control mode.
Examples:
Command to set the working temperature to15,5 °C:
out_sp_00
 15.5
Command to ask for the working temperature
in_sp_00

Response from the recirculating cooler:
15.5
 LF