LDM35-P_LDM35-S信号供电的有限距离调制解调器OMEGA欧米茄

信号供电：无需电源

光学隔离：断开接地回路

重型浪涌保护器：防止雷击损坏

LED诊断指示灯：简化安装和系统故障排除

在9600波特时行驶2英里（3.3公里），19200时行驶半英里（0.8公里），1200波特时行驶7英里（11.7公里）

四线全双工，双线单工

连接器的选择

宽工作温度范围，0至+70°C

零调制解调器开关

LDM35-P_LDM35-S信号供电的有限距离调制解调器OMEGA欧米茄

Signal-Powered: No Power Source Required

Optical Isolation: Breaks Ground Loops

Heavy Duty Surge Protectors: Prevents Lightning Damage

LED Diagnostic Indicators: Simplifies Installation and System Troubleshooting

Operation to Two Miles (3.3 KM) at 9600 Baud, One-Half Mile (0.8 KM) at 19,200, Seven Miles (11.7 KM) at 1200 Baud

Four-Wire Full Duplex, Two-Wire Simplex

Selection of Connectors

Wide Operating Temperature Range, 0 to +70°C

Null Modem Switch

The LDM35 Series of products is designed to allow video display terminals (VDTs) and other RS-232 devices to be connected over distances sufficient to cover any industrial or institutional complex of buildings. These modems feature a rugged enclosure small enough to mount on the back panel of VDT units, saving valuable desk and floor space. The LDM35 Series does not require a power supply for operation. The use of low power circuits and a sensitive optical receiver allows the devices to derive all necessary power from the RS-232 data and control signal. They are designed for full-duplex, asynchronous operation over two, DC-continuity, non-loaded, twisted-wire pairs. Two-wire simplex operation may be accomplished over two wires. The modem circuits and, consequently, the host device are protected from electrical transients due to lightning strikes or operation of heavy industrial equipment. Each device features a convenient Data-Communication Equipment (DCE) to Data-Terminal Equipment (DTE) switch which reverses pins 2 and 3 of the RS-232 connector. For installation and troubleshooting, each unit has diagnostic Light-Emitting Diodes (LEDs) on the transmit and receive lines. The RS-232 connector may be ordered as a male or female 25-pin connector. Field connection is made through a modern, solderless, screw-termination assembly. Alternatively, a convenient four-wire modular phone jack is available. Model LDM35 is powered by the RS-232 data and control signals from its host computer or terminal device. It receives power from Data Terminal Ready, pin 20 or Request To Send, pin 4, and Transmitted Data, pin 2. Transmitted data may be on pin 3 when the DCE/CTE switch is in the DTE position. For proper operation, minimum required signal voltage level is ±6 V at 3.0 mA to 10.0 mA.

LDM35-P_LDM35-S信号供电的有限距离调制解调器OMEGA欧米茄

LDM35系列产品的设计允许视频显示终端（VDT）和其他RS-232设备通过足够的距离连接，以覆盖任何工业或机构建筑群。这些调制解调器的特点是坚固的外壳小到可以安装在VDT设备的背板上，节省了宝贵的办公桌和地板空间。LDM35系列不需要电源即可工作。低功耗电路和灵敏的光学接收器的使用使设备能够从RS-232数据和控制信号中获得所有必要的电源。它们设计用于全双工、两个以上的异步操作、直流连续性、无负载、双绞线。两线单工操作可以通过两条线完成。因此，调制解调器电路和主机设备受到雷击或重型工业设备运行引起的电气瞬变的保护。每个设备都有***个方便的数据通信设备（DCE）到数据终端设备（DTE）的开关，它可以反转RS-232连接器的插脚2和3。对于安装和故障排除，每个单元的发射和接收线路上都有诊断发光二极管（LED）。RS-232连接器可订购为25针插头或插孔连接器。现场连接是通过***个现代的，无焊，螺丝终端组件。此外，还提供了***个方便的四线模块化电话插孔。LDM35型由主机或终端设备的RS-232数据和控制信号供电。它接收来自数据终端准备就绪、针脚20或发送请求、针脚4和发送数据针脚2的电源。当DCE/CTE开关处于DTE位置时，传输的数据可能位于插脚3上。为了正常工作，3.0 mA至10.0 mA时所需的***小信号电压水平为±6 V。