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Resumen del manual
Box 4047 ISO 9001 Certified Stamford, CT 06907-0047 TEL: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1, Canada TEL: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca For immediate technical or application assistance: U.S.A. and Canada: Sales Service: 1-800-826-6342 / I-8OO-TC-OMEGA® Customer Service: 1-800-622-2378 / 1-800-622-BEST® Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN® En Espanol: (001) 203-359-7803 e-mail: espanol@omega.com FAX: (001) 203-359-7807 info@omega.com.mx Servicing Europe: Postbus 8034,1180 LA Amstelveen, The Netherlands TEL: +31 (0)20 3472121 FAX: +31 (0)20 6434643 Toll Free in Benelux: 0800 0993344 e-mail: sales@omegaeng.nl Frystatska 184,733 01 Karvina, Czech Republic TEL: +420 (0)59 6311899 FAX: +420 (0)59 6311114 Toll Free: 0800-1-66342 e-mail: info@omegashop.cz 11, rue Jacques Cartier, 78280 Guyancourt, France TEL: +33 (0)1 61 37 2900 FAX: +33 (0)1 30 57 5427 Toll Free in France: 0800 466 342 e-mail: sales@omega.fr Daimlerstrasse 26, D-75392 Deckenpfronn, Germany TEL: +49 (0)7056 9398-0 FAX: +49 (0)7056 9398-29 Toll Free in Germany: 0800 639 7678 e-mail: info@omega.de One Omega Drive, River Bend Technology Centre Northbank, Irlam, Manchester M44 5BD United Kingdom TEL: +44 (0)161 777 6611 FAX: +44 (0)161 777 6622 Toll Free in United Kingdom: 0800-488-488 e-mail: sales@omega.co.uk It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification. The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice. WARNING: These products are not designed for use in, and should not be used for, human applications. Mexico: Benelux: Czech Republic: France: G ermany/Austria: United Kingdom: ISO 9002 Certified LDM70 Fully Isolated Limited Distance Modem Description The LDM70 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 pane! of VDT units, saving valuable desk and floor space. The LDM70 series is designed for full duplex, asynchronous operation over two DC-continuity, non-loaded, twisted-wire pairs. Through special highspeed optically coupled circuits, they may communicate at data rates up to 57,600 baud. A handshake operation is implemented over the same two-wire pairs. A self-powered model and a host-powered model are available. The self-powered unit uses 12VAC 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. In addition, LEDs indicate valid carrier detect and data terminal ready. The RS-232 connector may be ordered as a male or female 25-pin connector. Field connection is made through a modem, solderless, screw-termination assembly. Alternatively, a convenient four-wire modular phone jack (RJ-11) is available. * • DC to 57,600 Baud ' Complete Isolation with Optical Couplers'and Power DC-to-DC .Converter . ■ Dat^i Terminal Ready, Carrier .Detect Handshake without Extra Wires Surge Protectors ; -Four LED Diagnostic Indicators Operation to 3 Miles (5km) at 9600 Baud; -1 Mile (1.7km) at 19,200, 0.5 MileV(0.8km) at 57,609 - V'’ ■ - - :v? * Four-Wire Full Duplex', Two-Wire Simpjex • «■ Self-Powered ¿or Host-Powered ; - ' Selection'of Connectors ' ’ Wide Operating Temperature Range, f 0 to +70°C • ' >< ^ ,• v;. s» • , CE Compliant , • , RS-232 P1 Opto-iso Barrier +v « ^ i r> Screw Terms Field P2 Mod Phone Jack Light - Space RO {3 > RTS (4 CTS (?)- DTR <20¡ DSR (S)-VA—1 +DC (9)- +V -DC @- -V GND (7)— CASE (T> RLSD RLSD (i '4- •On* = Space +V _L _J —— Space Current —•- Marte Current -0 TD- '\y (Isolated Ground) 0 RJ-11 Screw Terms -Q] 12VAC [7] -|T) AC GND [|] I 33Q : L_-lg». RJ-11 0 0 Light2 Mark NOTE: TO, RD: Mark = -V, Space = +V Figure 1: LDM70 Block Diagram Specifications r‘TModel Baud Rate Range Baud Rate Dista nce(mile's) Distance(km) Power AC operation1'1 DC operation Dimensions MTTF'3' IÍDM70 0-57.6K 57.6K 38.4K 19.2K 9.6...