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XB24CZ7PITB003 参数 Datasheet PDF下载

XB24CZ7PITB003图片预览
型号: XB24CZ7PITB003
PDF下载: 下载PDF文件 查看货源
内容描述: [RF TXRX MOD 802.15.4 TRACE ANT]
分类和应用:
文件页数/大小: 180 页 / 2660 K
品牌: ETC [ ETC ]
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Operation  
I/O support  
Multiple samples per packet  
The IT parameter specifies how many I/O samples can be transmitted in a single OTA packet. Any  
single-byte value (0 - 0xFF) is accepted for input. However, the value is adjusted downward based on  
how many I/O samples can fit into a maximum size packet; see Maximum payload. A query of the IT  
parameter after changes are applied tells how many I/O samples actually occur.  
Since MM must be 0 or 3 to send I/O samples, the maximum payload in the best of conditions (short  
source address, short destination address, and no encryption) is 114 bytes. Seven of those bytes are  
used by the command header and the I/O header, leaving 107 bytes for I/O samples. The minimum I/O  
sample is 2 bytes. Therefore the maximum possible usable value for IT is 53 (or 0x35).  
API support  
I/O data is sent out the UART using an API frame. All other data can be sent and received using  
Transparent Operation or API frames if API mode is enabled (AP > 0).  
API Operations support two RX (Receive) frame identifiers for I/O data (set 16-bit address to 0xFFFE  
and the device does 64-bit addressing):  
n
0x82 for RX Packet: 64-bit Address I/O  
n
0x83 for RX Packet: 16-bit Address I/O  
The API command header is the same as shown in 64-bit Receive Packet - 0x80 and 16-bit I/O Sample  
Indicator - 0x83. RX data follows the format described in I/O data format.  
Periodic I/O sampling  
Periodic I/O sampling is done by periodically gathering samples on the source node and sending the  
samples to the destination node to output on its serial port.  
Source node  
On the source node, the IR parameter specifies how many milliseconds between samples. The IT  
parameter specifies how many samples will be sent OTA in a single packet, and the DH/DL parameters  
designate the node that will receive the samples. In addition MM must be 0 or 3 for I/O samples to be  
sent.  
The maximum value of IR is 0xFFFF. If IR is 0, periodic I/O sampling is disabled. Otherwise, IR specifies  
the number of milliseconds between samples.  
If IT is 0, than an I/O sample is sent every IR milliseconds. If IR is greater than 0, then an I/O sample is  
sent every IR*IT milliseconds. Any single-byte value (0 - 0xFF) is accepted for input. However, the  
value is adjusted downward based on how many I/O samples can fit into a maximum size packet. A  
query of the IT parameter after changes are applied tells how many I/O samples will actually occur.  
Since MM must be 0 or 3 to send I/O samples, the maximum payload in the best of conditions (short  
source address, short destination address, and no encryption) is 114 bytes. Seven of those bytes are  
used by the command header and the I/O header, leaving 107 bytes for I/O samples. The minimum I/O  
sample is 2 bytes. Therefore the maximum possible usable value for IT is 53 (or 0x35).  
XBee/XBee-PRO S2C 802.15.4 RF Module User Guide  
57  
 
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