SENA ProBee-ZE20S - Manual (Page 41)

41 ProBee-ZE20S User Guide Rev.1.10
Send multicast msg # Put the multicast message
+++ # Leave data mode
OK<CR> # Response
4.2.3 Broadcast Data Mode
Broadcast data mode can be used for continuous data transmission to all devices in the current network.
The destination address or group ID of the remote nodes is not necessary for broadcast data mode. The
transmit range is determined by the S-register 35.
Broadcast data mode can be entered using either ATB or AT+TRANSMITMODE=3. If ATB command is
used, the device will enter the broadcast data mode immediately and keep it until escaped using “+++” or
reset by ATZ. If the device is reset, it will not enter the broadcast data mode but command mode in this
case.
On the other hand, if AT+TRANSMITMODE=3 is used to enter the broadcast data mode, the device
enters the broadcast data mode again whenever the device is reset. To disable the broadcast data mode,
escape the data mode first by using “+++” string and use AT+TRANSMITMODE=0 and reset the device to
apply the setting permanently.
AT commands used for the broadcast data mode are as below.
ATB<CR>
Set broadcast data mode.
AT+TRANSMITMODE=3<CR> or AT+TM=3<CR>
Set the transmission mode to broadcast. It should be reset to apply the mode.
ATS35=n, where n is the broadcast range.
ATS36=n, where n is the radius.
Set data transmission range. Please refer to the chapter 9 S-Registers for more details.
Note: ZigBee compliance rules prevents flooding of the network by limiting the network to a maximum of 9
broadcasts over 8 seconds. Attempts to submit additional broadcasts beyond this should result in the
transmission error. This is approximately one broadcast per second. It is, however, recommended to
broadcast one packet over 2 seconds for safe transmission. Broadcast transmission failure also causes
retransmission which is affected by transmission timeout(S33) and transmission retries(S32). Because
frequent retransmissions may cause to break the broadcast limitation, it is recommended to set more than
1000 for transmission timeout(S33) and set as small as possible for transmission retries(S32).
Multicast data transmission is implemented on top of the network broadcast mechanism, so it is subject to