User's Manual

AC4424 Specifications
AC4424 SpecificationsAC4424 Specifications
AC4424 Specifications
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5.2.6
5.2.65.2.6
5.2.6 Serial Interface Baud Rate
Serial Interface Baud RateSerial Interface Baud Rate
Serial Interface Baud Rate
This two-byte value determines the baud rate used for communicating over the serial interface to a
transceiver. Table 5
Table 5 Table 5
Table 5 -
--
- Baud Rate/Timeout
Baud Rate/Timeout Baud Rate/Timeout
Baud Rate/Timeout lists values for some common baud rates. Baud rates below
110 baud are not supported. For a baud rate to be valid, the calculated baud rate must be within ±3%
of the OEM Host baud rate. If the 9600_BAUD pin (Pin 12) is pulled logic Low at reset, the baud rate
If the 9600_BAUD pin (Pin 12) is pulled logic Low at reset, the baud rate If the 9600_BAUD pin (Pin 12) is pulled logic Low at reset, the baud rate
If the 9600_BAUD pin (Pin 12) is pulled logic Low at reset, the baud rate
will be forced to 9,600
will be forced to 9,600will be forced to 9,600
will be forced to 9,600.
. .
. For Baud Rate values other than those shown in Table 5
Table 5 Table 5
Table 5 -
--
- Baud Rate
Baud Rate Baud Rate
Baud Rate, the
following equation can be used:
BAUD = (18.432E+06/(32*desired baud rate))
BAUD = (18.432E+06/(32*desired baud rate))BAUD = (18.432E+06/(32*desired baud rate))
BAUD = (18.432E+06/(32*desired baud rate))
BaudH= High 8 bits of BAUD (base16)
BaudH= High 8 bits of BAUD (base16)BaudH= High 8 bits of BAUD (base16)
BaudH= High 8 bits of BAUD (base16)
BaudL = Low 8 bits of BAUD (base16)
BaudL = Low 8 bits of BAUD (base16)BaudL = Low 8 bits of BAUD (base16)
BaudL = Low 8 bits of BAUD (base16)
Table
Table Table
Table 8
88
8 –
––
– Baud Ra
Baud Ra Baud Ra
Baud Rate
tete
te
Baud
Baud Baud
Baud
Rate
RateRate
Rate
BaudL
BaudL BaudL
BaudL
(42h)
(42h)(42h)
(42h)
BaudH
BaudH BaudH
BaudH
(43h)
(43h)(43h)
(43h)
Minimum Interface Timeout
Minimum Interface Timeout Minimum Interface Timeout
Minimum Interface Timeout
(58h)
(58h)(58h)
(58h)
288,000 02h 00h FFh
192,000 03h 00h FFh
115,200 05h 00h FEh
57,600 0Ah 00h FDh
38,400 0Fh 00h FCh
28,800 14h 00h FBh
19,200 1Eh 00h F9h
14,400 28h 00h F7h
9,600 3Ch 00h F2h
4800 78h 00h E5h
2400 F0h 00h CBh
1200 E0h 01h 97h
300 80h 07h 01h
110 74h 14h 01h
5.2.7
5.2.75.2.7
5.2.7 Network Topology
Network TopologyNetwork Topology
Network Topology
RF Channel Number
RF Channel NumberRF Channel Number
RF Channel Number – RF Channel Number provides a physical separation between co-located
networks. The AC4424 is a spread spectrum frequency hopping radio with a fixed hopping sequence.
Without synchronizing the different networks to each other, different channel numbers could possibly
interfere with each other and create “cross-talk.” To avoid cross-talk interference, co-located networks
should use Sync
SyncSync
Sync-
--
-t
tt
to
oo
o-
--
-Channel
ChannelChannel
Channel. A Server radio with Sync-to-Channel enabled will synchronize its
frequency hop timing to a system located on the RF Channel specified by Sync Channel
Sync ChannelSync Channel
Sync Channel. The only
requirement is that Sync Channel be numerically less than RF Channel. Therefore, every co-located
network will be synchronizing to the network with the lowest RF Channel. Four Channel sets are
provided for the AC4424. Frequency Offset is a protocol parameter used to satisfy unique international
requirements. Co
Co Co
Co-
--
-located networks must u
located networks must ulocated networks must u
located networks must use the same Channel Set.
se the same Channel Set.se the same Channel Set.
se the same Channel Set.