Remote control
36
9. Remote
control
9.1.
Communication with a PC or data system
ACTUAL
SET
For remote control, under the menu item
OP
(Operating mode) set the parameter to 1.
The message "rOFF" appears on the display.
In general, the computer (master) sends commands
to the recirculating cooler (slave). The recirculating
cooler sends data (including error messages) only
when the computer asks for it.
A transfer sequence consists of:
•
command
•
space
(
⇔
; Hex: 20)
•
parameter (the character separating
•
decimals in a group is the period)
•
end of file (
↵
; Hex: 0D)
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 setpoint to 5.5 °C:
out_sp_00
⇔
5.5
↵
•
Command to ask for the setpoint:
in_sp_00
↵
•
Response from the recirculating cooler:
↵
9.2.
List of commands
Command
Parameter Response of recirculating cooler
version
no
Number of software version
status
no
Status message (see below)
out_mode_04
out_mode_04
in_mode_04
0
1
no
Set control mode via PC
Set control mode via programmer input (O)
Ask for actual control mode
