JULABO CF41 Cryo-Compact Circulators - Manual (Page 68)

Remote control
68
11. Remote control
11.1. Setup for remote control
9 6
5 1
SERIAL
-OFF-
S xxxx
I xxxx
R
1. Check the interface parameters for both interfaces (on Cryo-Compact
Circulator and PC) and make sure they match.
In the menu >Interface< set the menu item >Type< to >RS232< or
>RS485<.( Serial interface see page 58)
2. In the menu >Configuration< set the menu item >Setpoint< to >RS232<
or >RS485<.
(>Configuration< see page 32)
3. Connect both units with an interface cable..

Like all parameters which can be entered through the keypad, interface
parameters are stored in memory even after the Cryo-Compact Circulator
is turned off.
11.2. Communication with a PC or a superordinated data system
If the Cryo-Compact Circulator is put into remote control mode via the configuration
level, the VFD COMFORT-DISPLAY will read „R -OFF-„ = REMOTE STOP. The
Cryo-Compact Circulator is now operated via the computer.
In general, the computer (master) sends commands to the Cryo-Compact Circulator
(slave). The Cryo-Compact Circulator 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:
 address (RS485 interface only)
 command
 space
( ; Hex: 20)
 parameter (the character separating decimals in a group is the period)
 end of file (; Hex: 0D)
 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 Cryo-Compact Circulator 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.