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LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距離調(diào)制解調(diào)器OMEGA

直流至57600波特

光學(xué)隔離

突波保護(hù)

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）

四線全雙工，雙線單工

自供電或主機(jī)供電

連接器的選擇

LDM30-P_LDM30-S_LDM30-PT_LDM30-ST通用有限距離調(diào)制解調(diào)器OMEGA

寬工作溫度范圍，0至+70°C

LDM30系列產(chǎn)品的設(shè)計(jì)允許視頻顯示終端（VDT）和其他RS-232設(shè)備進(jìn)行遠(yuǎn)距離連接，足以覆蓋任何工業(yè)或機(jī)構(gòu)建筑群。這些調(diào)制解調(diào)器具有堅(jiān)固的鋁制外殼，小到可以安裝在VDT設(shè)備的背板上，節(jié)省了寶貴的辦公桌和地板空間。LDM30系列設(shè)計(jì)用于雙絞線、直流連續(xù)、無負(fù)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(dá)57600波特的數(shù)據(jù)速率進(jìn)行通信。提供自供電模式和主機(jī)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(jī)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(diào)制解調(diào)器電路和主機(jī)設(shè)備受到雷擊或重型工業(yè)設(shè)備運(yùn)行引起的電氣瞬變的保護(hù)。每個(gè)設(shè)備都有一個(gè)方便的數(shù)據(jù)通信設(shè)備（DCE）到數(shù)據(jù)終端設(shè)備（DTE）的開關(guān)，它可以反轉(zhuǎn)RS-232連接器的插腳2和3。對(duì)于安裝和故障排除，每個(gè)單元的發(fā)射和接收線路上都有診斷發(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(xiàn)場連接是通過一個(gè)現(xiàn)代的，無焊，螺絲終端組件。此外，還提供了一個(gè)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(diào)制解調(diào)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.