Atlas Copco PowerMACS 4000, User Manual

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Peripheral Devices
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If this was the last available cycle data in the queue then another read would give the following result
(indicating that the queue is empty):
Empty package returned since queue is empty
0 0xFF
1 0xFF
SEQ = --1
2 0x00
3 0x04
LEN = 4
4 xx not set
5 xx not set
6 xx not set
7 xx not set
8.17.1 Data types
The following data types are used in the following sections:
Data type Description Values
Boolean 2 bytes, 16 bit unsigned binary Zero (0) represent False and non-zero True
Short integer 2 bytes, 16 bit, 2-complement signed
binary -
32768, …, +32767
Long integer 4 bytes, 32 bit, 2-complement signed
binary -
2 147 483 648, …, +2 147 483 647
Time 4 bytes, 32 bit long integer Number of seconds since January 1, 1970
Float or Real 4 bytes, 32 bit, IEEE-754 standard +/- 1.18 * 10
38
char[] Array of bytes containing ASCII-
character Null-terminated i.e. the byte after last relevant
character contains null, 0.
For data occupying more than one byte the order is that most significant byte comes first, at the lowest
address. This is also known as Big Endian or Motorola format.
8.17.2 Layout of Cycle data in Process data
The layout of Cycle data is set up by use of a Reporter.