控制、监控回路及保护线路，电器仪表、配电装置的信号传输、控制与测量的使用。在一30~C一60~C的环境条件下，自承式电缆的机械和电气性能保持不变。自承式通信电缆执行标准：YD/THYAC自承式通信电缆用途：适用于本地电信网的城市与乡镇电信线路，也适用于接入公用网的专用网线路。
RVV本产品适用于交流额定电压450/750V以下的家用电器小型电动工具、仪器仪表及动力照明等装置的连接。工作温度：电缆长期允许工作温度不超过70℃。KVVP 铜芯聚氯乙烯绝缘和护套编织屏蔽控制电缆。
特点：1交接跳线采用旋转卡夹式接线，并在金属卡件上用硅胶密封，因不仅接续可靠，经久耐用，具有不用剥线、操作检修方便。2交接箱内接线端子的排列，以25对为一基本单位，与市话电缆的基本单位一致，并在端子标有编号，便于施工检修。
RVV电线全称铜芯聚氯乙烯绝缘聚氯乙烯护套软电线，又称轻型聚氯乙烯护套软线,俗称软护套线，是护套线的一种。主要用于中、轻型移动电器、仪表仪器、家用电器、动力照明等柔性使用场所，可传输控制信号，也可传输动力信号，也适合敷设在桥架和软管中。
HYA internal communication cable (widely used in the construction of man communication network, mainly for overhead and pipeline installation, mainly for transmission of audio); HYAT packed communication cable (used in the construction of man communication network, mainly for pipeline installation, with water resistance effect, no need for inflation protection, mainly for transmission of audio); HYAC self-supporting communication cable (used in the construction of man communication network, overhead installation, convenient construction, mainly transmitting audio); HYAT53 filled armoured cable (HYA, a complex communications cable used in metropolitan area network construction); HYAT; HYAC manufacuring HYA communication cable type HYAC HYAT HPVV HYV HJVV HYY armoured communication cable HYA22 HYV22 HYAT22 HYY23 HYYT23 HYA23 HYAT23 HYA53 HYAT53 steel wire armoured communication cable H YA33 HYAT33 WDZ - HYA53 HYY33 HYYT33 HYY33 oil filled telecommunication cable HYAT HYYT execution: YD/T322-1996 structure features: Manufacuring HYA communication cable insulation using chromatography in the city, lu: su composite sheath of cable is applied to longitudinally wrap shielding ribbon and sheath bonded into an organic whole, forming sealing layer, has the superior electrical properties, the characteristics of the construction is convenient. Main electrical properties: 1. The dc resistance: 20 ℃, the copper wire 0.5 mm, less than or equal to 95 Ω/km. Insulated electrical strength: 2. 1 min 1 kv no breakdown between the conductor and conductor shielding 1 min 3 kv is not breakdown (3) insulation resistance: each conductor and the rest of the grounding wire core, more than 10000 m Ω manufacuring HYA cable. Km, more than 3000 m Ω HYAT cable. Km. 5. Remote crosstalk defense: 150kHZ, the average power of the combination is greater than 69dB/km. Mine communication cable: 1. Execution: mt818.14-1999 2 purpose: this product is used in well
单路232通信电路：三线方式，与上面的三级管搭的完全等效。USB转232电路：采用的是PL2303HX,价格便宜，稳定性还不错。SP706S复位电路：带看门狗和手动复位，价格便宜（美信的贵很多），R4为调试用，调试完后焊接好R4。SD卡模块电路（带锁）：本电路与SD卡的封装有关，注意与封装对应。此电路可以通过端口控制SD卡的电源，比较完善，可以用于5V和3.3V。但是要注意，有些器件的使用，5V和3.3是不一样的。
Product characteristics and USES: this product has high fireproof performance, through direct combustion flame, in a certain period of time is not short circuit and short circuit fault, therefore, when the fire broke out, is beneficial to reduce the loss, low smoke zero halogen type cable belong to environmental protection cable, especially suitable for fire to demand higher power, large buildings, railways, shipping industry, such as product standards Q/HHTZH009.2 refractory properties accord with GB12666.6 (IEC331) 1-90 requirement. ?? Ac rated voltage: U0/U 0.6/1 kv 2. ?? The highest working temperature for a long time: flame retardant PVC insulated and sheathed 70 ℃ and 105 ℃?? Fluorine plastic insulation and sheath 200 ℃ and 260 ℃ with cross-linked polyethylene insulation 90 ℃ 90 ℃ low smoke zero halogen flame retardant polyolefin low smoke zero halogen flame retardant crosslinked polyolefin 90 ℃ and 120 ℃. ?? Minimum ambient temperature: flame retardant PVC sheathed: fixed installation to 40 ℃, the fixed installation - 15 ℃ fluorine plastic insulation and sheath: fixed installation - 60 ℃; The fixed installation - 20 ℃ 4. Refractory characteristics: comply with IEC331 flame temperature 750 ℃, flame
RVVZ cable, RVV cable, RVVP cable, ZRVVR cable, ZRYJVR cable VVP shielding cable implementation standard jb8734-1998 RVVP shielding cable product introduction: RVVP shielding cable, rated voltage 300V/300V. Some core from 2 to 24 core, according to the national standard color separation between more than two core twisted into line, direction of outer stranded for right-handed, soft rounded oxygen-free copper wire or tin plating oxygen-free copper wire shielding, widely used in instruments, meters, building intercom, monitoring, monitoring control installation. Implementation standard: jb87345-1998 product quantity long-term mass supply packaging specification 200 m/roll; 500 meters/anaerobic copper coil wire core material number 1 ~ 24 core sheath material PVC/PE wire 26 largest diameter (mm) nominal section 0.12 ~ 2.5 (was) RVVP RVVP shielded cable core: twisted into cable, insulated conductor (PP) RVVP winding and polyester film screened cable sheath: black/white PVC shielded cable USES: used in building automation control system, anti-theft alarm system, fire control system, three table from copying systems, communications, audio, sound system, meter, electronic equipment and automation devices such as anti jamming circuit connection.
在使用RS485接口时，对于特定的传输线路，从RS485接口到负载其数据信号传输所允许的最大电缆长度与信号传输的波特率成反比，这个长度数据主要是受信号失真及噪声等影响所影响。理论上，通信速率在100Kbps及以下时，RS485的最长传输距离可达1200米，但在实际应用中传输的距离也因芯片及电缆的传输特性而所差异。
2、产品标准：GB5023.5-86《额定电压450/750V及以下聚氯乙烯绝缘电缆（电线）屏蔽电线》3、使用特性：1）额定电压U0/U为300/300V；2）电缆的长期允许工作温度：AVP-105、RVP-105型……应不超过105℃；其他型号……应不超过70℃4、型号、名称和使用范围型号名称。
当数据在高速率传输的情况下，线路就呈现传输线效应，此时负载的特性阻抗必须与输出相匹配，否则，就会导致信号回波反射、系统不能正常工作。即使某些情况下，可以通过在末端并联匹配电阻等方法来实现阻抗匹配，但长远来说，一旦该电阻因某种原因改变而会重新发生故障，再说，此种方法还会带来增大系统功率消耗的弊端。
属于新型环保电线电缆。火灾时烟雾过大，消防人员无法看清火情；含卤有机物燃烧时会释放有毒的烟气，容易熏倒消防人员。采用低烟无卤材料，就是基于上述因数来考虑的。YVV,YVVP,RVV,RVVP仪表用电缆1、产品用途：本产品适用于仪表、仪器及其它电器设备中的信号传输及控制线路。
主要用于不易接触的地方，如老式电感镇流器。0I类:这类电器有工作绝缘，有接地接零端子，可以接线也可以不接线(如用于干燥环境，木质地板的室内)如电烙铁。I类:该类电器触电保护不仅依靠工作绝缘还依靠内部的接地端子(其设备外壳不设接地端子)自设备内引出带保护插头的电源线，将接地端子接黄绿双色线。如电冰箱、洗衣机电风扇、空调等均属此类。Ⅱ类:带有双重绝缘或加强绝缘的设备，无接地接零要求。所谓双重绝缘是指除基本的工作绝缘外，还提供独立的保护绝缘或加强绝缘，以及附加有效的安全措施。
DJYPVPR polyethylene insulation on twisted copper wire braided partial shielding and total shielding polymerization
This process specification provides for rated voltage 450/750v, single core 1.5-500mm2 PVC insulated or polyolefin insulated flame-retardant fire resistant soft cable; And 0.6/1kv single core 4~500mm2, 2~5 cores 1.5~240mm2 polychlorinated insulated or polyolefin insulated flame-retardant fire resistant flexible cables process specifications, technical requirements, and acceptance rules. The main models of this process specification are: rated voltage 450/750v: za-rv; WDZA - RY, etc. Rated voltage 0.6/1kv: za-rvv, za-rvv22, wdza-ryy, wdza-ryy23, wdna-ryy, wdna-ryy23. 2? Usage characteristics, classification and nomenclature of cables 2.1? Service characteristics 2.1.1 cable rated operating voltage: 450/750v, 600/1000v. 2.1.3 temperature under installation should not below 0 ℃. 2.1.4 small bending radius of cables: unarmored cables: the flame retardant type is 6 times the outer diameter of cables, and the fire resistant type is 12 times the outer diameter of cables; The armored cable is 20 times the outer diameter of the cable. 2.2? The cable type consists of 5 parts: serial code, insulation, sheath material code, outer sheath and performance code.