9PFLST B&B Electronics

9PFLST-0812-1/3 2002 by B&B Electronics. All rights reserved. Model 9PFLST Port-Powered RS-232 Fiber Optic Modem with Handshake Support Description The 9PFLST allows any two pieces of RS-232 asynchronous serial equipment to communicate full-duplex over two multi-mode fibers. Typical distances up to 2.5 miles (4 km) are possible with no external power required. The 9PFLST supports both data signals at up to 115.2 kbps as well as the RTS/CTS handshake lines. This means the 9PFLST can replace short haul modems and isolators when connecting remote devices, while providing the EMI/RFI and transient immunity of optical fiber. RS-232 connections are provided on the same DB9 female connector, while the multi-mode fiber is connected via two ST connectors. The unit is port powered by the RS-232 Transmit Data and handshake lines. When handshake lines are not available, or when using a low power RS-232 port, the 9PFLST can be powered by an external 12VDC supply, drawing 50 mA max. RS-232 Connections Connection of the 9PFLST is simple and straightforward. The DB9 female serial connector is used for connecting the RS-232 data and handshake signals. The connector is pinned as a DCE device (input on Pin 3 and output on Pin 2.) This means that a straight through cable can be used from your DB9 port from any DTE device such as a PC or terminal. For connecting to modems or other DCE devices, a null modem cable or adapter that swaps pins 2 & 3 is needed. Care should be taken that any output handshake lines be connected through to the 9PFLST to power the unit. See Figure 1 for connection diagrams to 9 pin and 25 pin DTE and DCE devices. Figure 1: RS-232 Connection Diagrams DB25 DTE Device 9PFLST DB9 DB25 DCE Device 9PFLST DB9 2 TD 3 2 TD 2 (RD) 3 RD 2 3 RD 3 (TD) 4 RTS 7 4 RTS 8 (CTS) CTS 7 (RTS) 5 CTS 8 5 20 DTR 4 20 POWER 6 6 DSR or POWER 4 (DTR) 8 8 DCD 7 Signal GND 5 7 Signal GND 5 DB9 DTE Device 9PFLST DB9 DB9 DCE Device 9PFLST DB9 3 TD 3 3 TD 2 (RD) 2 RD 2 2 RD 3 (TD) 7 RTS 7 7 RTS 8 (CTS) 8 CTS 8 8 CTS 7 (RTS) 4 DTR 4 4 POWER 6 6 DSR or POWER 4 (DTR) 1 1 DCD 5 Signal GND 5 5 Signal GND 5 www.bb-elec.com orders bb-elec.com support bb-elec.com International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104 European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445 PRODUCT INFORMATION B&B ELECTRONICS 9PFLST-0812-2/3 2002 by B&B Electronics. All rights reserved. Fiber Optic Connections The 9PFLST uses a separate LED emitter and photo-detector operating at 820 nm wavelength. Connections to the emitter and detector are on ST type connectors. Almost any multi-mode glass fiber size can be used including 50/125 m, 62.5/125 m, 100/140 m, and 200 m. Two fibers are required between the two modems, one for data in each direction. The most important consideration in planning the fiber optic link is the power budget of the fiber modem. This value tells you the amount of loss in dB that can be present in the link between the two modems before the units fail to perform properly. This value will include line attenuation as well as connector loss. For the 9PFLST the typical connector-to-connector power budget is 12.1 dB. Because 62.5/125 m cable typically has a line attenuation of 3 dB per km at 820 nm, the 12.1 dB power budget translates into 2.5 miles (4 km). This assumes no extra connectors or splices in the link. Each extra connection would typically add 0.5 dB of loss, reducing the possible distance by 166 m (547 ft.) Your actual loss should be measured before assuming distances. When the 9PFLST is used without external power, the power available to the Fiber Optic transmitter may be less than the typical value. The link should be tested with the 9PFLST in place with a variable attenuator to check the optical power budget of the whole system. Figure 2: Typical Setup TX RX Duplex RS-232 RS-232 9PFLST 9PFLST Multimode DEVICE DEVICE Fiber RX TX Specifications Transmission Line: Dual multi-mode optical cable Transmission Mode: Asynchronous, half or full-duplex, point-to-point Interface: RS-232 Signals: Transmit Data, Receive Data, Request to Send, Clear to Send Data Rates: 0 to 115.2 kbps Typical Range: Up to 2.5 miles (4 km) on multi-mode glass fiber Coupled Power Budget: 12.1 dB Optic Wavelength: 820 nm Connectors: DB9 Female for serial connection, ST Connectors for fiber Power Supply: Port Powered from Transmit Data, RTS, and DTR lines Optional External Power Supply: 10 16 VDC 50 mA max. Dimensions: 4.3 x 1.7 x 1.0 in (10.9 x 4.3 x 2.4 cm) DECLARATION OF CONFORMITY Manufacturers Name: B&B Electronics Manufacturing Company Manufacturers Address: P.O. Box 1040 707 Dayton Road Ottawa, IL 61350 USA Model Number: 9PFLST Description: Port-Powered Fiber Optic Modem Type: Light industrial ITE equipment Application of Council Directive: 89/336/EEC Standards: EN 55022 EN 61000-6-1 EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11) Robert M. Paratore, Director of Engineering www.bb-elec.com orders bb-elec.com support bb-elec.com International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104 European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445 PRODUCT INFORMATION B&B ELECTRONICS