Справочник Пользователя для AeroComm Corporation 4424200
Ordering Information
3/23/2006
27
5.4 I
NTERFACE
T
IMEOUT
/RF P
ACKET
S
IZE
Interface timeout, in conjunction with RF Packet Size, determines when a buffer of data will be sent out
over the RF as a complete RF packet based on whichever condition occurs first.
over the RF as a complete RF packet based on whichever condition occurs first.
Interface Timeout – Interface Timeout specifies a maximum byte gap in between consecutive bytes.
When that byte gap is exceeded, the bytes in the transmit buffer are sent out over the RF as a
complete packet. Interface timeout is adjustable in 160uS decrements. The actual timeout created by
Interface Timeout is equal to the 2's complement of Interface Timeout times 160uS. The default value
for Interface Timeout is F0H or 2.56ms.
When that byte gap is exceeded, the bytes in the transmit buffer are sent out over the RF as a
complete packet. Interface timeout is adjustable in 160uS decrements. The actual timeout created by
Interface Timeout is equal to the 2's complement of Interface Timeout times 160uS. The default value
for Interface Timeout is F0H or 2.56ms.
RF Packet Size – When the amount of bytes in the transceiver transmit buffer equals RF Packet Size,
those bytes are sent out as a complete RF packet.
those bytes are sent out as a complete RF packet.
5.5 S
ERIAL
I
NTERFACE
B
AUD
R
ATE
This two-byte value determines the baud rate used for communicating over the serial interface to a
transceiver. Table 7 - Baud Rate 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 will
be forced to 9,600. For Baud Rate values other than those shown in Table 7 - Baud Rate, the following
equation can be used:
transceiver. Table 7 - Baud Rate 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 will
be forced to 9,600. For Baud Rate values other than those shown in Table 7 - Baud Rate, the following
equation can be used:
BAUD = (18.432E+06/(32*desired baud rate))
BaudH= High 8 bits of BAUD (base16)
BaudL = Low 8 bits of BAUD (base16)
Table 7 – Baud Rate
Baud
Rate
BaudL
(42h)
BaudH
(43h)
Minimum Interface Timeout
(58h)
288000 02h 00h
FFh
192000 03h 00h
FFh
115200 05h 00h
FEh
57600 0Ah 00h
FDh
38400 0Fh 00h
FCh
28800 14h 00h
FBh
19200 1Eh 00h
F9h
14400 28h 00h
F7h
9600 3Ch 00h
F2h
4800 78h 00h
E5h
2400 F0h 00h
CBh
1200 E0h 01h
97h
300 80h 07h
01h
110 74h 14h
01h