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The checksum is defined by summing up all bytes, beginning with the address byte and
including the separator (:) in an exclusive-OR-operation () :
CS = address_H address_L data byte 1 data byte 2 . . . data
byte n separator
The checksum is calculated as one 8-bit binary value (00
in its upper and lower byte (nibbles). After the HEX values of the two nibbles have been
transferred to the corresponding two ASCII characters (0 to 9 instead of 0
A to F instead of A
H
added)
the checksum is written into the telegram.
,
The power stage also calculates (Exclusive OR) the checksum of the received data. The
telegram will be rejected if a difference to the received checksum is detected.
If there is no need to validate the contents of the telegram, the checksum monitoring can
be set off. Instead of the checksum bytes, two X characters will be accepted by the power
stage. As well, telegrams without checksum and without: (separator) will be accepted, e.g.:
| 1 | R | 4 | 0 | : | X | X |
Example:
<STX>
| 1 | R | 4 | 0 |
Example:
<STX>
10.3 Operating Parameters
The operating parameters are stored in a permanent memory of the power stage.
In the following table the operating parameters are defined with
W for write
R for read and
X for execute.
For current values reading or writing is applied:
Integer value x 1/100 = valid current or voltage value
Example:
480 x 1/100 = 4.8 (A
+
The MSX
instruction set mostly consists of one-byte-instructions. From the second byte,
the data for the instruction will follow.
The instructions for additional parameters with instruction code P are two-byte instructions.
The data will begin on the third byte in these instructions.
By L or U input after the instruction code the maximum permissible instruction limits, by I
input after the instruction code the function of the instruction are displayed. Scale and unit
(Einheit) of current and time values can be read by S and E.
The following table provides an overview of these options:
Additional
Function
input to the
to F
that means to each nibble 30
H,
<ETX>
r.m.s
to FF
h
or rather 37
H
or
<ETX>
)
Example Description
39
phytron
). This byte is taken apart
h
to 9
and
H
H
is mathematically
H
Answer
MA 2128-A004 EN
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