JULABO FLW4006 Recirculating Coolers - Manual (Page 29)

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11. Remote control
11.1. Setup for remote control
9 6
5 1
RS232
Check the interface parameters for both interfaces (on recirculating cooler and
PC) and make sure they match.
Interface parameters are pre-determined.
Type RS232
Baudrate 4800 bauds
Parity even
Handshake hardware
handshake
11.2. Communication with a PC or a superordinated data system
If the recirculating cooler is put into remote control mode the MULTI-DISPLAY
(LED) will read „R -OFF-„ = REMOTE STOP. The recirculating cooler is now
operated via the computer.
In general, the computer (master) sends commands to the recirculating cooler
(slave). The recirculating cooler sends data (including error messages) only
when the computer sends a query.

In remote control mode:
After a power interruption the order to start and all values which have to be
adjusted must be resent from the personal computer via the interface.
AUTOSTART is not possible.
A transfer sequence consists of:
command
out/in command
space (
; Hex: 20) out/in command
parameter (the character separating decimals in a group is the period)
out command
end of file (
; Hex: 0D) out/in command
The response (data string) after an in command is always followed by a line
feed (LF, Hex: 0A).
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