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参数资料
| 型号： | EK2550 |
| 厂商： | Synapse Wireless |
| 文件页数： | 39/42页 |
| 文件大小： | 0K |
| 描述： | NETWORK EVAL KIT VERSION 2.1 |
| 标准包装： | 1 |
| 类型： | 收发器，SNAP |
| 适用于相关产品： | RF300PC1 |
| 已供物品： | 3 个板，3 根天线，线缆，CD，文档 |
| 其它名称： | 746-1049 EK2550-ND Q5101768 |
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likely to work in other nodes and vice versa. The underlying structure and grammar will
be the same, but Python provides access to more data types and libraries than SNAPpy
does.
Note that the GUI part of this script really has little to do with SNAP; you’ll need other
references if you want to explore programming Python on the PC further. For advanced
applications, user-interfaces, etc. the SNAPconnect product provides a way for your
application to participate in the SNAP network.
When you’ve finished playing with portalMcastCounter, you may want to “unload” this
script from Portal. Removing a script is done in the same way for all SNAP nodes: just
use the Erase SNAPpy Image (
) button on the Node Info tab’s toolbar. (For Portal, the
button is labeled Erase Portal Base File.)
Radio Range Testing
Now let’s change the behavior of the nodes again. The SN111 board has a seven-segment
display on it. We can use this display to provide real-time information on radio
performance (receiver link quality).
NOTE! – The “LinkQualityRanger” script is not compatible with kits using the RF300
RF Engine
Upload script “LinkQualityRanger.py” into SN171 (Device Type = “Buzz”) and SN111
(Device Type = “Photo”) nodes. The two nodes will begin multicasting “test” messages
to each other, at a rate of 10 messages per second (one message every 100 milliseconds).
When script “McastCounter.py” was running in these nodes, the seven-segment display
showed a “current count” value. That count value could be changed by pressing a button
on any of the nodes running the McastCounter.py script.
Now the seven-segment display shows radio receiver link quality. The display is updated
every second with a link quality value (0-99%, where 99% is best), averaged over the last
10 received messages.
Your node on the SN111 board should be displaying a link quality value higher than 0.
Depending on how close the nodes are to each other, your displayed link quality might be
as high as 99%. Note that if your nodes are too close to each other, lower values may be
observed due to receiver saturation.
At this point you might want to move the units around, and see how link quality is
affected by both distance and intervening structures or obstacles.
This brings us to our next topic: How can we easily move the nodes around, when they
have power cords and/or cables attached to them?
EK2500 Users Guide-v1.7
Page 39
of 42
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| EK25B0012 | 功能描述:器件套件 Engineering Kit RoHS:否 制造商:AVX 零部件类型: |
| EK26 | 功能描述:放大器 IC 开发工具 Eval Kit PA60EU RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| EK-26597-C36 | 功能描述:麦克风 5.56 X 3.98 X 2.21MM RoHS:否 制造商:Knowles Acoustics 方向性:Omnidirectional 阻抗:4.4 K Ohms 工作电压:0.9 V to 10 V 灵敏度:- 53 dB 端接类型:Wire Leads 长度:5.56 mm 宽度:3.98 mm 深度:2.21 mm |
| EK2660-7R | 功能描述:EURO-CASSETTE 150W 2X 24V RoHS:否 类别:电源 - 外部/内部（非板载） >> DC DC Converters 系列:* 标准包装:1 系列:Quint 类型:隔离 输入电压:24V 输出:24V 输出数:1 输出 - 1 @ 电流（最大）:24 VDC @ 50A 输出 - 2 @ 电流（最大）:- 输出 - 3 @ 电流（最大）:- 输出 - 4 @ 电流（最大）:- 功率（瓦特）:1200W 安装类型:底座安装 工作温度:0°C ~ 40°C 效率:- 封装/外壳:模块 尺寸/尺寸:4.33" L x 9.09" W x 6.14" H（110mm x 231mm x 156mm） 包装:散装 电源（瓦特）- 最大:1200W 批准:- 其它名称:277-69722866365-NDQUINT-BAT/24DC/12AH |
| EK2660-9ER | 制造商:Power-One 功能描述:DCDC - Bulk |
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