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| LDM2485A and LDM2485B Signal Powered High Speed RS-232 to RS-485 Converters Dataforth's Model LDM2485A & LDM2485B high speed, RS-232 to RS485 interface converters can turn your PC, terminal or other RS-232 device into an RS-485 workstation. Operating over 2 to 4 wires, at data rates up to 115.2 kbps, Models LDM2485A & LDM2485B let your RS-232 machine talk with up to 50 addressable devices in a multipoint polling environment. Since multipoint environments can be difficult to work with, these products have five separate configuration parameters (carrier control, RTS/CTS delay, receive impedance, transmit-off impedance and echo) that allow you to fine tune the converters to your particular application. And to keep your application up and running, both models have built in surge protection. The Model LDM2485A has a DB-25 connector for RS-232 environments, while the Model LDM2485B has a DB-9 connector for EIA-574. Both models have several options for twisted pair connection. Features A AVAILABLE WITH DB-25 (RS-232) OR DB-9 (EIA-574) INTERFACE A CONFORMS TO THE EIA RS-485 STANDARD A OPERATES ASYNCHRONOUSLY, POINT-TO- POINT OR MULTIPOINT, OVER 2 OR 4 WIRES A UP TO 50 TERMINAL DROPS IN A MULTIPOINT POLLING ENVIRONMENT A DATA RATES TO 115,200 BPS A RANGE UP TO 9.0 MI (14.5 KM) A DATA PLUS ONE CONTROL SIGNAL PASSED IN Specifications Model Transmission Format Data Rate Range Data Rate bps Distance km mi 4.2 LDM2485A/LDM2485B Asynchronous 0-115.2K bps 115.2K 2.6 4.7 38.4K 2.9 7.4 9.6K 4.6 14.5 1.2K 9.0 EACH DIRECTION A SELECTABLE RTS-CTS DELAY A ABLE TO OPERATE WITH OR WITHOUT "ECHO" A CARRIER MAY BE CONTINUOUS OR RS-232/EIA-574 Interface DB-25/DB-9 RS-485 Interface Options Transmit Line Transmit Mode Control Signals RJ-11 or RJ-45 jack or terminal block with strain relief 2, 4 wire unconditioned twisted pair 4-wire, full or half duplex; 2-wire half duplex DSR turns "ON" immediately after the terminal raises DTR; DCD turns "ON" after recognizing the receive signal from the line; CTS turns "ON" after the terminal raises RTS. 0 or 8 msec The carrier is switch selected either continuous operation or controlled by RTS 600W power dissipation at 1 ms Draws operating power from the RS-232 or EIA-574 data and control signals; no AC power or batteries required. 32 to 122 F (0 to 50 C) 2.66" x 2.10" x 0.73" (68 x 53 x 19 mm) 2.50" x 1.20" x 0.75" (64 x 31 x 19 mm) 2 oz (57 gm)/1.4 oz (40 gm) "CONTROLLED BY RTS" A NO AC POWER OR BATTERIES REQUIRED A 600 WATTS OF SILICON AVALANCHE DIODE SURGE PROTECTION -STANDARD Dataforth does not authorize or warrant its products for use in life support/critical applications. Ordering Information LDM2485A-P LDM2485A-S LDM2485A-PJ1 LDM2485A-SJ1 LDM2485A-PJ4 LDM2485A-SJ4 LDM2485A-P25S LDM2485A-S25S LDM2485B-P LDM2485B-S LDM2485B-PJ1 LDM2485B-SJ1 LDM2485B-PJ4 LDM2485B-SJ4 Male DB-25 w/terminal block Female DB-25 w/terminal block Male DB-25 w/RJ-11 jack Female DB-25 w/RJ-11 jack Male DB-25 w/RJ-45 jack Female DB-25 w/RJ-45 jack Male DB-25 w/female DB-25 Female DB-25 w/female DB-25 Male DB-9 w/terminal block Female DB-9 w/ terminal block Male DB-9 w/RJ-11 jack Female DB-9 w/RJ-11 jack Male DB-9 w/RJ-45 jack Female DB-9 w/RJ-45 jack (R) RTS/CTS delay Carrier Surge Protection Power Temperature Size: 2485A Size: 2485B Weight 26 |
Price & Availability of LDM2485A-P25S
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