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LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距離調制解調器OMEGA

直流至57600波特

光學隔離

突波保護

LED診斷指示燈

在9600波特時行駛3英里（5公里），19200時行駛1英里（1.7公里），57600時行駛0.5英里（0.8公里）

四線全雙工，雙線單工

自供電或主機供電

連接器的選擇

LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距離調制解調器OMEGA

寬工作溫度范圍，0至+70°C

LDM30系列產品的設計允許視頻顯示終端（VDT）和其他RS-232設備進行遠距離連接，足以覆蓋任何工業或機構建筑群。這些調制解調器具有堅固的鋁制外殼，小到可以安裝在VDT設備的背板上，節省了寶貴的辦公桌和地板空間。LDM30系列設計用于雙絞線、直流連續、無負載、雙絞線的全雙工異步操作。通過特殊的高速光耦合電路，它們可以以高達57600波特的數據速率進行通信。提供自供電模式和主機供電模式。自供電裝置使用來自壁掛式變壓器的12伏交流電，而主機供電裝置從RS-232連接器的插腳9和10獲得±直流電源。因此，調制解調器電路和主機設備受到雷擊或重型工業設備運行引起的電氣瞬變的保護。每個設備都有一個方便的數據通信設備（DCE）到數據終端設備（DTE）的開關，它可以反轉RS-232連接器的插腳2和3。對于安裝和故障排除，每個單元的發射和接收線路上都有診斷發光二極管（LED）。RS-232連接器可訂購為25針插頭或插孔連接器。現場連接是通過一個現代的，無焊，螺絲終端組件。此外，還提供了一個方便的四線模塊化電話插孔。

LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距離調制解調器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.