Lauda INTEGRAL XT - 6. Interface commands; 6.1 Additional commands for RS 232;485 and Ethernet interface; 6.1.1 Write commands

Flow controller MID 20
20
6. Interface commands
The following interface commands are valid for flow rate control. Input is via the selected
interface on the Integral XT.
6.1 Additional commands for RS 232/485 and Ethernet interface
6.1.1 Write commands
Data specifications to the flow meter:
Command
Meaning
PO_4_25_0_E6
Switch on the flow rate control.
PO_4_25_1_E7
Switch off the flow rate control.
PO_4_24_XX.XX_CS
Specify the target value for the flow rate control.
Setup of the write command PO_4_24_XX.XX_CS
The value CS is a checksum.
The value XX.XX is within the range of 00.00 to 20.00 in the unit L/min
CS depends on the value XX.XX and can be calculated as follows:
All digits before the checksum are shown in decimal and added up. The calculated value is converted
to hexadecimal and the last two digits are added to the command as a checksum.
Example:
Target flow rate value: PO_4_24_XX.XX_CS
With a target flow rate of 12.34 L/min, the calculation is as follows:
‘P’ = 80
D
‘O’ = 79
D
‘_’ = 95
D
.4 = 52
D
‘_’ = 95
D
‘2’ = 50
D
‘4’ = 34
D
‘_’ = 95
D
‘1’ = 49
D
‘2’ = 50
D
‘.’ = 46
D
‘3’ = 51
D
‘4’ = 52
D
‘_’ = 95
D
The sum of “PO_4_24_12.34_” is 923
D
= 39B
H
.
The CS is then the last two digits of the hexadecimal checksum, i.e. 9B
H
.
The following character string must thus be transferred:
PO_4_24_12.34_9B<CR>