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参数资料
| 型号： | NM485DC |
| 厂商： | Murata Power Solutions Inc |
| 文件页数： | 4/6页 |
| 文件大小： | 0K |
| 描述： | ISOLATED INTERFACE EIA-485 DL |
| 标准包装： | 15 |
| 系列： | IsoLoop® |
| 类型： | 收发器，隔离式 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS485 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 24-DIP（0.667"，16.95mm） |
| 供应商设备封装： | 24-DIL |
| 包装： | 管件 |
| 产品目录页面： | 2721 (CN2011-ZH PDF) |
| 其它名称： | 811-1445-5 |
NM485DC Series
Isolated Dual EIA-485 Driver and Receiver
KII_NM485DC.A05 Page 4 of 6
www.murata-ps.com/support
APPLICATION NOTES (continued)
System Performance
The EIA-485 standard allows a maximum of 32 unit loads to be connected to the network, this is less than the LONWORKS standard of 64 nodes. A unit load is any single
driver, receiver or transceiver in the EIA-485 standard, or any single node under the LONWORKS scheme. Similarly the EIA-485 standard species a maximum data rate
standard of 10Mbps, whereas the maximum LONWORKS data rate standard is 1.25Mbps. The resultant maximum system performance for the LONWORKS EIA-485 con-
guration is therefore 32 nodes at 1.25Mbps. The NM485D isolated serial interface devices supports this conguration, as well as any lower specied system.
The EIA-485 standard denes the maximum line length as a function of data rate (in Mbps). This implies that the user must choose between the line length of the network
and its maximum data transmission rate.
The isolated interface has been used in previous congurations (e.g. NM232D) to increase the available line length as isolated data lines are much less susceptible to
ground currents and variations in local supplies. The feature of isolation in a LON environment is intended to be used primarily to improve noise susceptibility, therefore,
unless the line length improvements can be reliably demonstrated by the user, the EIA-485 recommendations on maximum cable length are assumed to apply.
The complete hardware implementation for the LONWORKS EIA-485 network is relatively simple and straight forward (see gure 5). There is a minimum of components
required, only 1 interface part and one resistor, and the complete LONTALK transmission protocols are supported. The isolation barrier of 1000Vrms offers improved noise
immunity compared to a non-isolated system and eliminates node-to-node supply voltage mismatch and possible ground current loops.
If protection from voltage transients is required, then a bi-directional TransZorb from each line side to ground should be connected (see gure 6). A TransZorb with a
breakdown voltage higher than the common-mode voltage required should be used. However the added parasitic capacitance will load down the bus, and should therefore
be taken into consideration.
Figure 5
Figure 4
Figure 6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NM485SLC | 功能描述:RS-485接口IC Iso Dual EIA-485 Driver and Receiver RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| NM4B | 制造商:Panduit Corp 功能描述:Cable Accessories 制造商:Panduit Corp 功能描述:NM4 AND NMF4 BLANKING KIT - Bulk |
| NM-4-F4 | 制造商:ESSENTRA COMPONENTS 功能描述:LOOP CLAMP W/EYELET NAT 1/4" 制造商:Richco 功能描述:LOOP CLAMP W/EYELET NAT 1/4" |
| NM4-KIT | 制造商:Panduit Corp 功能描述:KIT FOR NM4 制造商:Panduit Corp 功能描述:KIT FOR NM4 - Bulk |
| NM-4-R4 | 功能描述:LOOP CLAMP W/ EYELET GRN 1/4" RoHS:是 类别:线缆，导线 - 管理 >> 线夹和夹具 系列:NM-R 标准包装:100 系列:TC 类型:C-夹 开口尺寸:0.79" L x 0.54" W x 0.67" H（20.1mm x 13.7mm x 17.0mm） 安装类型:钉子 材质:聚丙烯 颜色:黑 |
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