Linx Technologies HUM-xxx-DT - Manual (Page 25)

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Send Broadcast Packet - Command Code = 39
This command is used by an AP to send a broadcast message to all of its
associated EDs at one time.
The LEN byte is the number of bytes in the DATA field plus 1 for the LEN
byte. DATA can be up to 32 bytes.
The broadcast message is sent by the AP and is output by all of the
EDs connected to the AP. This allows a single transmission to update all
modules instead of having to address separate messages to each one.
The response parameter indicates if the command was successful (00) or if
there was an error (01).
The EDs output the broadcast message as shown in Figure 47.
The LEN byte is the total number of parameter bytes, including the LEN
byte, data bytes and RSSI byte.
The DATA field is up to 32 bytes of data.
The RSSI byte is the RSSI for the received broadcast message. It is
returned in 2’s complement hex format. The RSSI value in dBm is
calculated the same as the other RSSI values.
RSSI (dBm) = RSSI_value (in the response) - 256
Read Associated Modules - Command Code = 3A
This command reads out all of the modules that are associated with the
current module.
If the current module is an ED or RE, then the only associated node is the
AP. An AP can have up to 50 associated EDs in a single network. Due to
the lack of intelligence in an RE, this command does not provide the RE
information.
The first response contains the number of modules associated with
the current module. The module then outputs one response for each
associated module that contains that module’s address.
Send Broadcast Packet Command and Response
Command
Start Command Param 1 Param 2 End
3C 39 LEN DATA 3E
Response
Start Response Param 1 End
3C 39 Status 3E
Figure 46: Send Broadcast Packet Command and Response
Read Associates List Command and Response
Command
Start Command End
3C 3A 3E
Response 1
Start Response Param 1 End
3C 3A NumMod 3E
Response 2
Start Response Param 1 Param 2 Param 3 Param 4 End
3C 3A SrcAdr3 SrcAdr2 SrcAdr1 SrcAdr0 3E
. . .
Response n
Start Response Param 1 Param 2 Param 3 Param 4 End
3C 3A SrcAdr3 SrcAdr2 SrcAdr1 SrcAdr0 3E
Figure 48: Read Associates List Command and Response
Received Broadcast Packet
Start Command Param 1 Param 2 Param 3 End
3C 39 LEN DATA RSSI 3E
Figure 47: Received Broadcast Packet