Temperature System Magnum 91
63
11.2. Communication with a PC or a superordinated data system
In general, the computer (master) sends commands to the instrument (slave). The
instrument sends data (including error messages) only when the computer sends a
query.
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 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.
When the RS485 interface is used, the three-digit instrument address stands in front
of each command.
(example: address Ad32 = A
032
)
Examples:
Command to set the working temperature to 55.5 °C
out_sp_00
⇔
55.5
↵
A032_out_sp_00
⇔
55.5
↵
Command to ask for the working temperature T1:
in_sp_00
↵
A032_in_sp_00
↵
Response from the instrument:
55.5
↵
A032_55.5
↵
