WT.050.560.001.UA.IM.0714
83
Depolox
®
3 plus ReSIDUAl ANAlYZeR
eVoQUA
W3T140188
Additional functions of the check byte (Bit 4 through 7):
Bit (7654)
Function
1000
Minimum value of the variable
0100
Maximum value of the variable
0010
Default value of the variable
0001
additional information of the variable
If no bit is set in bits 5 through 7, the actual value is written or read. Other-
wise the corresponding additional information is sent by the slave.
• Special case: With “negative confirmation,” the check byte includes an
additional information about the error occurred. With “positive confirma-
tion,” the check byte is set to 00Hex.
Value:
Function:
01H
End of address table
02H
Wrong data format
04H
Additional information not available
08H
Variable to set not within min. and max. limits
10H
reading access not permitted
20H
reading access permitted but wrong password
40H
writing access not permitted
80H
writing access permitted but wrong password
C0H
writing access not permitted (wrong operation mode)
• Number byte: Defines the number of bytes to read or to write.
• Frame Check: The sum of the control bytes of a frame is stored in the frame
check.
FC = (unsigned char) SB + SA + ZA + KB + AB
• Data unit: Includes data informations be sent by slave or master.
• Data check: The check sum of the data bytes of a frame is stored in the
data check.
CD = (unsigned char) sum of DU
• End byte: Marks the end of a frame. Value is always 16Hex.
Summary of Contents for Wallace & Tiernan Depolox 3 plus
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