EVM-900-DT 查看數據表（PDF） - Unspecified

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EVM-900-DT

HumDT™ Series RF Transceiver Module

Unspecified 

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.

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

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.

Received Broadcast Packet

Start Command Param 1 Param 2 Param 3

End

3C

39

LEN

DATA

RSSI

3E

Figure 47: Received Broadcast Packet

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

– 44 –

Read Associated Modules - Command Code = 3A

This command reads out all of the modules that are associated with the

current module.

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

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.

– 45 –

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