Linx HUM-868-PRC, Руководство по данным

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Addressing Modes
The module has very flexible addressing methods selected with the
ADDMODE register. It can be changed during operation. The transmitting
module addresses packets according to the addressing mode
configuration. The receiving module processes all addressing types
regardless of the
ADDMODE configuration. If the received message
matches the addressing criteria, it is output on the UART. Otherwise it is
discarded. The
ADDMODE configuration also enables assured delivery.
There are three addressing modes: DSN, User and Extended User. Each
mode offers different communications methods, but all use source and
destination addressing. The source address is for the transmitting unit,
the destination address is the intended receiver. Each mode uses different
registers for both the source and destination addresses.
Extended User Addressing mode uses the four user destination address
bytes (
UDESTID [3-0]) as a destination address. The module’s local address
is contained in the four user source ID registers ( USRCID [3-0]).
In normal operation, each module has a user ID mask ( UMASK [3-0]) that
splits the 32 address bits into up to three fields to provide a network
address and address fields for sub-networks, supporting both individual
addressing and broadcast addressing within the user’s network.
The HumPRC
TM
Series is normally configured using the Join Process,
which sets the addressing mode to Extended User mode. The other modes
would normally only be used if the HumPRC
TM
Series is being implemented
in a mixed system that also uses the HumPRO
TM
Series modules.
Please see the HumPRO
TM
Series data guide for a description of the
other addressing modes. A detailed explanation and examples for each
addressing mode are given in Reference Guide RG-00105.
Reading the Transmitter Address
The HumPRC
TM
Series modules do not require any software for basic
operation. There is no compiler to get, no code to write and download into
the module. However, the built-in Command Data Interface (CDI) can be
used to add additional or advanced functionality to a system.
One such feature is the ability to read out of the receiver the identity of the
transmitter that sent the commands. This allows an external processor to
log access attempts or set additional controls over which transmitters are
allowed to activate the product outside of the module.
By default, the module automatically configures itself to respond to the
transmitting module (
AUTOADDR = 0x07). This configuration takes the
source address from the received packet and writes it to the UDESTID
registers
UDESTID[0-3] . Reading these registers after a valid transmission
has been received indicates the transmitter that sent the command.
Restore Factory Defaults
The transceiver is reset to factory default by taking the PB line high briefly
4 times, then holding PB high for more than 3 seconds. Each brief interval
must be high 0.1 to 2 seconds and low 0.1 to 2 seconds. (1 second
nominal high / low cycle). The sequence helps prevent accidental resets.
Once the sequence is recognized, the MODE_IND line blinks in groups
of three until the PB line goes low. After PB goes low, the non-volatile
configurations are set to the factory default values and the module is
restarted. The default UART data rate is 9,600bps.
If the timing on PB does not match the limits, the sequence is ignored.
Another attempt can be made after lowering PB for at least 3 seconds.