LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距离调制解调器OMEGA

直流至57600波特

光学隔离

突波保护

LED诊断指示灯

在9600波特时行驶3英里（5公里），19200时行驶1英里（1.7公里），57600时行驶0.5英里（0.8公里）

四线全双工，双线单工

自供电或主机供电

连接器的选择

LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距离调制解调器OMEGA

宽工作温度范围，0至+70°C

LDM30系列产品的设计允许视频显示终端（VDT）和其他RS-232设备进行远距离连接，足以覆盖任何工业或机构建筑群。这些调制解调器具有坚固的铝制外壳，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。LDM30系列设计用于双绞线、直流连续、无负载、双绞线的全双工异步操作。通过特殊的高速光耦合电路，它们可以以高达57600波特的数据速率进行通信。提供自供电模式和主机供电模式。自供电装置使用来自壁挂式变压器的12伏交流电，而主机供电装置从RS-232连接器的插脚9和10获得±直流电源。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。每个设备都有一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。现场连接是通过一个现代的，无焊，螺丝终端组件。此外，还提供了一个方便的四线模块化电话插孔。

LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距离调制解调器OMEGA

DC to 57,600 Baud

Optical Isolation

Surge Protectors

LED Diagnostic Indicators

Operation to 3 Miles (5 KM) at 9600 Baud, 1 Mile (1.7 KM) at 19,200, 0.5 Miles (0.8 KM) at 57,600

Four-Wire Full Duplex, Two-Wire Simplex

Self-Powered or Host-Powered

Selection of Connectors

Wide Operating Temperature Range, 0 to +70°C

The LDM30 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 aluminum enclosure small enough to mount on the back panel of VDT units, saving valuable desk and floor space. The LDM30 Series is designed for full-duplex, asynchronous operation over two, DC-continuity, non-loaded, twisted-wire pairs. Through special high-speed optically-coupled circuits they may communicate at data rates up to 57,600 baud. A self-powered model and a host-powered model are available. The self-powered unit uses 12 Vac from a wall-mounted transformer while the host-powered unit takes ±DC power from pins 9 and 10 of the RS-232 connector. 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.