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LDM35-P_LDM35-S信號(hào)供電的有限距離調(diào)制解調(diào)器OMEGA歐米茄

信號(hào)供電：無需電源

光學(xué)隔離：斷開接地回路

重型浪涌保護(hù)器：防止雷擊損壞

LED診斷指示燈：簡化安裝和系統(tǒng)故障排除

在9600波特時(shí)行駛2英里（3.3公里），19200時(shí)行駛半英里（0.8公里），1200波特時(shí)行駛7英里（11.7公里）

四線全雙工，雙線單工

連接器的選擇

寬工作溫度范圍，0至+70°C

零調(diào)制解調(diào)器開關(guān)

LDM35-P_LDM35-S信號(hào)供電的有限距離調(diào)制解調(diào)器OMEGA歐米茄

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信號(hào)供電的有限距離調(diào)制解調(diào)器OMEGA歐米茄

LDM35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)備通過足夠的距離連接，以覆蓋任何工業(yè)或機(jī)構(gòu)建筑群。這些調(diào)制解調(diào)器的特點(diǎn)是堅(jiān)固的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。LDM35系列不需要電源即可工作。低功耗電路和靈敏的光學(xué)接收器的使用使設(shè)備能夠從RS-232數(shù)據(jù)和控制信號(hào)中獲得所有必要的電源。它們?cè)O(shè)計(jì)用于全雙工、兩個(gè)以上的異步操作、直流連續(xù)性、無負(fù)載、雙絞線。兩線單工操作可以通過兩條線完成。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***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。現(xiàn)場(chǎng)連接是通過***個(gè)現(xiàn)代的，無焊，螺絲終端組件。此外，還提供了***個(gè)方便的四線模塊化電話插孔。LDM35型由主機(jī)或終端設(shè)備的RS-232數(shù)據(jù)和控制信號(hào)供電。它接收來自數(shù)據(jù)終端準(zhǔn)備就緒、針腳20或發(fā)送請(qǐng)求、針腳4和發(fā)送數(shù)據(jù)針腳2的電源。當(dāng)DCE/CTE開關(guān)處于DTE位置時(shí)，傳輸?shù)臄?shù)據(jù)可能位于插腳3上。為了正常工作，3.0 mA至10.0 mA時(shí)所需的***小信號(hào)電壓水平為±6 V。