Industrial Data Communication Products Data Comm. LDM80 Signal Powered Fiber Optic Modem Description The LDM80 is equivalent to a 3-wire, full duplex, RS-232 circuit. Handshake signals are locally connected as in Figure 1. Indicating LEDs come on during a "SPACE" on transmit or receive data. A TD/RD reversing DIP switch is provided for connection to DTE (Data Terminal Equipment) or DCE (Data Communication Equipment) ports. ▲ The LDM80 is a small, inexpensive fiber optic transmitter/receiver completely powered by the host RS-232 port. The enclosure for the LDM80 is a conductive shell which greatly reduces RF radiation and susceptibility. The rugged metal enclosure is small enough to mount on the back panel of typical computer equipment saving valuable desk and floor space. A pair of these units allows most RS-232C cable links to be replaced and extended with a duplex fiber optic cable. The normal 50-foot (15m) RS-232 limit may be extended to 2.2 miles (3.5 km). Fiber optic data communications provide complete EMI/RFI rejection, isolation, elimination of ground loops, and reduced error rates. Data security is enhanced by almost nonexistent electromagnetic emissions. The RS-232 connection is through male or female EIA 25-pin connectors. The fiber optic connection is either through SMA (905) or ST connectors. Features Data Rates to 19.2k Baud at 2.2 Miles (3.5km) 17dB Optical Link Power Budget Powered by RS-232 Host Port Signals Full Duplex Asynchronous Operation Indicating LEDs DCE/DTE Switch Designed for FCC Class A Requirements Complies with FCC Class A Requirements Connectored Cables Available Pinned or Socketed RS-232 Connectors CE Compliant Specifications Dataforth does not authorize or warrant its products for use in life support/critical applications. LDM80 Model Baud Rate Range Distance Over Baud Rate Range Fiber Core Diameter (µm) 100.0 (glass) 50.0 (glass) 62.5 (glass) 85.0 (glass) 200.0 (glass) 1000.0 (plastic) 0-19.2K Max Cable Length 2.2 mi (3.5) (km) 1.6 (2.6) 1.2 (1.9) 2.2 (3.5) 2.2 (3.5) 98 feet 30 (meters) Modes Asynchronous 2-fiber full duplex, 1-fiber simplex Loss Budget (dB) 17 9 11 16 23 32 Channel Lines Control Lines(1) TD, RD RTS, CTS, DTR, DSR, RLSD Optical Transmitter Output from 1m cable Optical Receiver Power Input for 4µs Pulse Distortion Optical Connectors 850 nm wavelength -26dB typ, -27dB min, -18dB max -44dB min ST, SMA (905) Compatible RS-232 Output Voltage with 3kΩ Load +5V logic 0, -5V logic 1 (1) DCE/DTE Switch 1 Diagnostic LEDs 2 Power Port Power and/or DC operation +5.0 to +8.5VDC, no current limit, 5mA >+8.5 VDC, 10mA current limit Environmental: Operating Temperature Range Storage Temperature Range Relative Humidity -20°C to +70°C -40°C to +85°C 0-95% non-condensing Dimensions 3.57 x 2.1 x 0.74 (90.7mm x 53.3mm x 18.8mm) Weight 4.2 oz (119g) max MTTF >100,000 hrs (2) NOTES: (1) TD = Transmit Data, RD = Receive Data, RTS = Request To Send, CTS = Clear To Send, DTR = Data Terminal Ready, DSR = Data Set Ready, RLSD = Received Line Signal Detect. (2) Ground-benign environmental conditions (no salt atmosphere, <50°C ambient temperature). SD1070 Rev B Visit our website www.dataforth.com Industrial Data Communication Products Data Comm. Recommended Cables Installation The LDM80 optical transmitter may be used with a wide range of fiber sizes. Specifications are for 100/140µm. Other fiber sizes may be used with a resulting different cable loss budget. See Specifications on previous page for cable diameter, distance, and loss budget trade-off. Fiber optic cables may be ordered with connectors factory installed. Power is supplied through a high RS-232 signal, normally current limited, applied to any of pins 4, 5, 6, 8 or 20. If the LDM80 is powered by a voltage source, V > +8.5VDC, the current must be limited to 10mA. Voltage sources, V < = +8.5VDC, will need no current limit. Voltage sources, V < +8.0VDC, will lower transmission distances. The minimum operating supply voltage for the LDM80 is +5.0VDC and correct operation below this voltage is not guaranteed. LDM85CA (1 or 2) Cable Model No. of Fibers Fiber Type Connector Type Core Diameter Cladding Diameter Outside Cable Diameter One (CA1) or two (CA2) Glass ST, SMA (905) 100µm 140µm 0.12 in (3 mm) each For installation check-out it is recommended that a short fiber optic cable be connected from transmit to receive on a locally connected device. See Figure 2 for a typical installation. Max Attenuation Per Channel 2dB plus 6.4dB/mi (4dB/km) Max. Installation Load Per Channel Max. Operational Load Per Channel 67 lb (300 N) 33 lb (150 N) Min. Bend Radius-Unloaded 1.2 in (3 cm) Temperature Operating Storage Relative Humidity -20°C to +70°C -40°C to +85°C 0-95%, non-condensing Pin Descriptions Fiber Optic Pin 1 Case Pin 2 TD Pin 3 RD Pin 4 RTS Pin 5 CTS Pin 6 DSR Pin 7 SIG GND Pin 8 RLSD Pin 20 DTR         WARNING! Voltage sources greater than +8.5VDC without current limit will damage the LDM80! VDT Figure 2: Typical LDM80 Installation Case Ground Transmit Data T Receive Data Request To Send Clear To Send R Data Set Ready Signal Ground Receive Line Signal Detect Data Terminal Ready Pin numbers given are for the 25-pin connector with the 9-pin equivalent in [ ]. Figure 1: LDM80 Block Diagram For information call 800-444-7644 LDM80 LDM80 CPU Industrial Data Communication Products Ordering Information Model Description LDM80-P Pinned RS-232 connector, SMA (905) fiber optic connector Socketed RS-232 connector, SMA (905) fiber optic connector Pinned RS-232 connector, ST fiber optic connector Socketed RS-232 connector, ST fiber optic connector Single-channel optical cable,SMA Dual-channel optical cable, SMA Single-channel optical cable, ST Dual-channel optical cable, ST LDM80-S LDM80-P-025 LDM80-S-025 LDM85CA1-XXXX(1) LDM85CA2-XXXX(1) LDM86CA1-XXXX(1) LDM86CA2-XXXX(1) NOTES: (1) Specify length to the nearest meter. Example: LDM85CA2-0550 for 550 meters dual cable. Maximum length available is 1000 meters. Figure 3: LDM80 Dimensions Visit our website www.dataforth.com Data Comm.
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