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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(xué)隔離

突波保護

LED診斷指示燈

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

四線(xiàn)全雙工，雙線(xiàn)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(chǎn)品的設計允許視頻顯示終端（VDT）和其他RS-232設備進(jìn)行遠距離連接，足以覆蓋任何工業(yè)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(xiàn)、直流連續、無(wú)負載、雙絞線(xiàn)的全雙工異步操作。通過(guò)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(jìn)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(lái)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(yè)設備運行引起的電氣瞬變的保護。每個(gè)設備都有一個(gè)方便的數據通信設備（DCE）到數據終端設備（DTE）的開(kāi)關(guān)，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(gè)單元的發(fā)射和接收線(xiàn)路上都有診斷發(fā)光二極管（LED）。RS-232連接器可訂購為25針插頭或插孔連接器?，F場(chǎng)連接是通過(guò)一個(gè)現代的，無(wú)焊，螺絲終端組件。此外，還提供了一個(gè)方便的四線(xiàn)模塊化電話(huà)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.