SENA ProBee-ZE20S - Manual (Page 35)

35 ProBee-ZE20S User Guide Rev.1.10
ATS36=n, where n is the radius.
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
the same rules.
4.1.4 Sending Binary Data
Because some characters like carriage return, line feed and back space collides with AT commands in
command mode and back slash(‘\’) is used for control character for binary encoding, they cannot be
transmitted as they are. The characters out of range between 0x20(Space) and 0x7E(‘~’) in hexadecimal
are not expressed at the AT commands for transmitting data. In order to transmit these characters in
command mode, these characters must be encoded in a command line. The examples of special
characters encoding are shown in Table 4-1.
Table 4-1 Examples of Special Characters Encoding
HEX Abbreviation Glyph Encoded Description
00 NULL - \00 Null character
0D CR - \0D Carriage return
0A LF - \0A Line feed
08 BS - \08 Backspace
09 HT - \09 Horizontal Tab
7F DEL - \7F Delete
5C - \ \5C Control character for binary encoding
For example, when sending abc<CR> with AT+BROADCAST command, the command should be as
follows:
AT+BROADCAST=abc\0D<CR>
4.1.5 Display Incoming Message
S11 register determines whether incoming message will be shown or not in the command mode. In the
data mode, on the other hand, incoming data is always displayed. To change the S11 register, please use
the AT command as below: