IM 50.560CA UA (B/4-03) 59
DEPOLOX
®
3 PLUS RESIDUAL ANALYZER
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 ad-
dress is allocated (slave address). The address can be a number be-
tween 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 ad-
dress 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
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