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WT.050.560.001.UA.IM.0714
82
Depolox
®
3 plus ReSIDUAl ANAlYZeR
eVoQUA
W3T140188
3.7.4.1
Description of the Bytes of the Frames
• Synchronization bytes: Used for the synchronization of the user units to
the others.
• Start byte (SB): Marks the begin of a frame.
The value depends on the type of the frame:
Request frame
10H
Set frame
68H
Answer frame
68H
Positive confirmation
A2H
Negative confirmation
DCH
• Slave address: To every module in the RS485 bus a special bus address is
allocated (slave address). The address can be a number between 0 and 31
Dec.
NOTE: The Depolox® 3
plus
module uses up to two bus addresses because
of the two-fold function of the module (Cl
2
measurement, pH or fluoride
measurement).
• Destination address: Determines the transmission variable in the address
reference list, that is to be read or written.
• Check byte: Determines the type of information to be read from the slave.
Also the data format is defined.
Data format of the check byte (Bit 0 through 3):
Bit (3210)
Dez.
Format:
0000
0
Default (to address reference list)
0001
1
Default (to address reference list)
0010
2
Boolean
0011
3
Boolean
0100
4
unsigned Character
0101
5
signed Character
0110
6
unsigned Integer
0111
7
signed Integer
1000
8
unsigned long Integer
1001
9
signed long Integer
1010
10
Floating Point
1011
11
Floating Point
1100
12
ASCII
1101
13
ASCII
1110
14
Mixed data format
1111
15
Mixed data format
Содержание Wallace & Tiernan Depolox 3 plus
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