24 The
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Slot Name
Description
This field is either the least significant byte of the 16 bit
checksum or the 8 bit checksum.
The checksum is calculated by adding together all 513 slot
values in the previous packet (i.e. include the start code).
The type of checksum can be determined by the Control Bit
Field:
Control Bit 7
Control Bit 6
Checksum Type
0 0
No
Checksum
0
1
8 bit Checksum
1
0
Non allowed state
4
LSB or 8 bit
Checksum
1
1
16 bit Checksum
5
SIP Sequence
Number
This field contains an 8 bit counter that increments for each SIP
packet. The purpose of the field is to allow equipment to check
that SIP’s are arriving in sequence without loss of data.
This field is displayed in decimal.
6
DMX512
Universe
Number
This field contains the number of the original universe output of
the lighting console. In installations where the lighting console
outputs a large number of universes, this field provides a simple
method to identify cables in the patch bay.
The valid range is 1 to 255. A value of zero indicates that the
field is unused.
The number is displayed in decimal.
7
DMX512
Processing
Level
All consoles and originating devices send this field as zero. Any
inline processing devices such as merges and Ethernet
transcoders can increment this value when the SIP is
regenerated. This provides an indication of the number of times
that the data has been post processed. This field is useful in
very large installations where the data may have been
processed several times.
The number is displayed in decimal.
8
Software
Version
This is the software version of the device that generated the
SIP.
The valid range is 1 to 255. A value of zero indicates that the
field is unused.
The number is displayed in decimal.
This field shows the number of data slots transmitted in standard
zero start code frames. The value is 16 bit and is displayed in
hexadecimal. The values are shown below:
Value Meaning
0x0000
The packet length has not been
declared.
0x0001– 0x0200
Fixed length packet in the range 1 to
512
0x0201- 0x7fff Unused values
9/10
Packet Length
0x8000
The packet length is variable.
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