參數(shù)資料
型號(hào)： IC_SS
文件頁(yè)數(shù)： 19/36頁(yè)
文件大小： 480K
代理商： IC_SS
Command Descriptions
(Continued)
Functionality
Flush Command Buffer and return Master to default autopoll
state, also return to host current software revision (binary
format).
Command:
Set Preamble Length
[
CMD
]
k
Ctrl-M
lk
Length
l
[
CMD
]
k
ACK
l
Syntax:
Response:
Functionality
Sets number of bytes of preamble the modem will use.
Command:
Chip Reset
[
CMD
]
k
Ctrl-G
lk
Arg 1
lk
Arg 2
l
Lower nibble
e
Master filter
Upper nibble
e
0 for Slave, 1 for Master
Unit address (1–255, 0
e
previous address)
[
CMD
]
k
ACK
l
Syntax:
Arg 1:
Arg 2:
Response:
Functionality
Performs a soft reset of the modem allowing change of
identity and addresses.
Command:
Chip Status Request
[
CMD
]
k
Ctrl-H
l
[
CMD
]
k
ACK
lk
Retry count
lk
Information
byte dependent on unit i.d.
l
Syntax:
Response:
Functionality
Returns status information: Retry count and, for Slave, Mas-
ter filter (upper nibble); or, for Master, currently addressed
Slave address.
Command:
Set Tune
[
CMD
]
k
Ctrl-E
lk
Arg 1
l
Tune code (binary number). Ctrl-A
e
tune 0,
. . . , Ctrl-E
e
tune 4. If an illegal tune code is
passed as an argument, then the frequency
hop mechanism will be reenabled and the cur-
rent tune will remain unchanged.
[
CMD
]
k
ACK
lk
Current tune code (lower
nibble)
l
Syntax:
Arg 1:
Response:
Functionality
Master: Disables frequency hop mechanism and sets cur-
rent tune to the value of the argument.
Slave: Sets the current tune to the value of the argument.
LEDs also display the current tune code.
Command:
Set Bit Rate
[
CMD
]
k
Ctrl-L
lk
Arg-1
l
Data rate code (binary number) Ctrl-A
e
3200 bps, Ctrl-B
e
1212 bps, Ctrl-C
e
800 bps, Ctrl-D
e
400 bps. An illegal argu-
ment will re-enable automatic data rate con-
trol.
[
CMD
]
k
ACK
lk
New Bit Rate
l
Syntax:
Arg 1:
Arg 2:
Functionality
Sets the modem bit rate based on the value of
k
New Bit
Rate
l
data.
k
New Bit Rate
l
is a two bit value in the upper
two bits of the lower nibble of the byte returned.
EXTERNAL PARAMETER SETTINGS
Provision is made for setting the baud rate and word struc-
ture of the serial interface through external latches, which
may be connected to DIP switches. These are read through
the MICROWIRE interface to the microcontroller during ini-
tialization. Refer to Figure 6 for the interface circuitry re-
quired. If the user’s circuit does not include DIP switches
then the default conditions are those corresponding to all
switches off. The parity settings depend on the settings of
the DIP switches as shown in Table IV.
TABLE IV. Parity Control
DIP Switch 1.3
DIP Switch 1.2
Parity
off
on
odd
on
off
odd
on
on
even
off
off
none
The baud rate depends on the settings of the DIP switches
as shown in Table V.
TABLE V. Baud Rate Settings
DIP
DIP
DIP
Baud
Rate
Switch 1.6
Switch 1.1
Switch 1.0
on
off
off
300
off
on
1200
DIP switch 1.4 is used to configure the host port as serial or
parallel. DIP switch 1.5 is used to configure the modem as
either a Master or a Slave. Refer to Table VI.
TABLE VI. Modem Configuration
DIP Switch
1.4
DIP Switch
1.5
on
Parallel
Slave
off
Serial
Master
19
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