Cryo-Compact Circulators
71
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 61)
2. In the menu >Configuration< set the menu item >Setpoint< to >RS232<
or >RS485<.
(>Configuration< see page 35)
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.