The LDM35-P is a signal-powered RS-232 line driver designed for connecting video display terminals and other RS-232 devices over long distances, suitable for industrial and institutional environments. It operates without an external power supply, deriving power from the RS-232 data and control signals. The device supports full-duplex asynchronous communication over two twisted-wire pairs and can also function in two-wire simplex mode. It features heavy-duty surge protection to safeguard against electrical transients, such as those caused by lightning or heavy machinery. Diagnostic LEDs for transmit and receive lines facilitate installation and troubleshooting. The LDM35-P is available with a male or female 25-pin RS-232 connector and utilizes a screw-termination assembly for field connections. It operates within a temperature range of 0¬8C to +70¬8C and is compliant with RoHS III standards. The product is suitable for applications in industrial building communications and data centers, extending communication distances significantly, with a maximum range of 7 miles at lower bit rates.
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 line drivers 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 line driver 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 (RJ-11) is available.
| Dataforth Corporation | |
|---|---|
| Product Category | Line Drivers |
| Product Number | LDM35-P |
| Product Name | Signal Powered RS-232 Line Driver |
