參數(shù)資料
型號(hào): PONE-000-01
廠商: Electronic Theatre Controls, Inc.
英文描述: The ideal device for simple nodes, such as switches, actuators and sensor
中文描述: 在簡(jiǎn)單的節(jié)點(diǎn),如交換機(jī),執(zhí)行器和傳感器的理想設(shè)備
文件頁數(shù): 34/56頁
文件大?。?/td> 432K
代理商: PONE-000-01
March 2000
CEWay
PL-One Data Sheet
D-CW-0100-04
Page 34 of 56
General Definitions
Packet Symbols
Preamble symbol
Preamble symbol
Data symbol
Data symbol
CRC symbol
CRC symbol
ZERO:
ONE:
ZERO:
ONE:
ZERO:
ONE:
2.28 USTs (SUPERIORs, phase 1, or INFERIOR)
1.14 USTs (SUPERIORs, phase 1, or INFERIOR)
2 USTs (SUPERIORs, phase 1 or phase 2)
1 USTs (SUPERIOR, phase 1 or phase 2)
1 USTs (SUPERIOR, phase 2)
1 USTs (SUPERIOR, phase 1)
Packet Delimiters :
Preamble EOF (PEOF):
End Of Field (EOF):
End Of Packet (EOP):
8 USTs (SUPERIORs, phase 1)
3 USTs (SUPERIORs, phase 1 or phase 2)
4 USTs (SUPERIORs, phase 1 or phase 2)
Ref : EIA 600.31, Section 5.1.1
Packet Fields
Preamble field, Control field, Destination Address (DA) field, Destination House Code (DHC) field,
Source Address (SA) field, Source House Code (SHC) field, Information field and a CRC.
These are the various fields contained in a packet. Note that not all these fields need to be present
to form a packet. For example, ADR_IACK packets do not contain the SA or SHC fields; IACK and
FAILURE packets do not contain the DA, DHC, SA or SHC fields.
Ref : EIA 600.42, Section 2.2.2, 2.2.4 and 2.2.6.
Packet Field Parts
Preamble field, Control field, DA low byte, DA high byte, DHC low byte, DHC high byte, SA low byte,
SA high byte, SHC low byte, SHC high byte, all Information bytes and the CRC indication.
Note that the term
packet field parts
is used to represent the various parts of a packet, exchanged
between the PL-One firmware and PLSES. This is not necessarily a complete packet field since
one-byte buffers are used (Ph_Rx Buffer or Ph_Tx Buffer) when exchanging a packet; as well, most
fields are longer than one byte in length.
Symbol Noise
When a noise on the medium has been perceived as a packet symbol. This can be generated
either by Preamble symbols having been partly received due to a transmitted partitioned packet,
Preamble symbols being received where a sudden noise buries the rest of the packet, or when a
real noise is being interpreted as a packet symbol.
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