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參數(shù)資料
| 型號(hào)： | EM2420TR |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver |
| 中文描述： | 2.4 GHz IEEE 802.15.4標(biāo)準(zhǔn)/ ZigBee的射頻收發(fā)器 |
| 文件頁(yè)數(shù)： | 40/89頁(yè) |
| 文件大?。?/td> | 1758K |
| 代理商： | EM2420TR |
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EM2420
Ember Part Number: 120-0049-000
C
EM2420 Datasheet
Page 40 of 89
requires knowledge about whether the
current device is a PAN coordinator or not.
Acknowledge Frames
The
EM2420
includes hardware support for
transmitting acknowledge frames, as
specified in [1]. Figure 21 shows the
format of the acknowledge frame.
If
MDMCTRL0.AUTOACK
is enabled, an
acknowledge frame is transmitted for all
incoming frames accepted by the address
recognition with the acknowledge request
flag set and a valid CRC.
AUTOACK
therefore does not make sense unless
also
ADR_DECODE
and
AUTOCRC
are
enabled. The sequence number is copied
from the incoming frame.
AUTOACK
may be used for non-beacon
systems as long as the frame pending
field (see Figure 17) is cleared. The
acknowledge frame is then transmitted 12
symbol periods after the last symbol of the
incoming frame. This is as specified by [1]
for non-beacon networks.
Frame
Control Field
(FCF)
MAC Header (MHR)
Data
Sequence
Number
2
1
Frame Check
Sequence
(FCS)
MAC Footer
(MFR)
2
Frame
Length
Start of Frame
Delimiter
(SFD)
Bytes:
1
1
Preamble
Sequence
4
Synchronisation Header
(SHR)
PHY Header
(PHR)
Figure 21. Acknowledge frame format [1]
Two
SACKPEND
acknowledge frames with the frame
pending field cleared or set, respectively.
The
acknowledge
transmitted if the CRC is valid.
command
strobes,
defined
SACK
to
and
are
transmit
frame
is
only
For systems using beacons, there is an
additional timing requirement that the
acknowledge frame transmission should
be started on the first backoff-slot
boundary (20 symbol periods) at least 12
symbol periods after the last symbol of the
incoming frame. This timing must be
controlled by the microcontroller by issuing
the
SACK
and
SACKPEND
command strobe
12 symbol periods before the following
backoff-slot boundary, as illustrated in
Figure 22.
If a
SACK
or
SACKPEND
command strobe
is issued while receiving an incoming
frame,
the
acknowledge
transmitted 12 symbol periods after the
last symbol of the incoming frame. This
should be used to transmit acknowledge
frames in non-beacon networks. This
timing is also illustrated in Figure 22.
frame
is
Using
SACKPEND
will set the pending data
flag
for
automatically
acknowledge frames using
AUTOACK
. The
pending flag will then be set also for future
acknowledge
frames,
command strobe is issued.
transmitted
until
a
SACK
Acknowledge frames may be manually
transmitted
using
transmission if desired.
normal
data
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| EM242302 | 功能描述:柵欄接線端子 EURO MC421-38102 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類型:Screw 觸點(diǎn)電鍍:Tin |
| EM242303 | 功能描述:柵欄接線端子 EURO MC421-38103 TERM RoHS:否 制造商:TE Connectivity / AMP 產(chǎn)品:Barrier Terminal Blocks 系列: 類型:Dual Barrier, Flat Block without Mounting Ears 節(jié)距:9.53 mm 位置/觸點(diǎn)數(shù)量:2 線規(guī)量程:22-12 電流額定值:20 A 電壓額定值:300 V 安裝風(fēng)格:Through Hole 安裝角:Vertical 端接類型:Screw 觸點(diǎn)電鍍:Tin |
| EM242608H | 功能描述:可插拔接線端子 EuroMag Pluggable Terminal Block RoHS:否 制造商:Phoenix Contact 產(chǎn)品:Plugs 系列:PTS 端接類型:Spring Cage 位置/觸點(diǎn)數(shù)量:5 線規(guī)量程:26-14 節(jié)距:5 mm 電流額定值:10 A 電壓額定值:250 V 安裝風(fēng)格: 安裝角: 觸點(diǎn)電鍍: |
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