26 a ordering information ldm2485a-p male db-25 w/terminal block ldm2485a-s female db-25 w/terminal block ldm2485a-pj1 male db-25 w/rj-11 jack ldm2485a-sj1 female db-25 w/rj-11 jack LDM2485A-PJ4 male db-25 w/rj-45 jack ldm2485a-sj4 female db-25 w/rj-45 jack ldm2485a-p25s male db-25 w/female db-25 ldm2485a-s25s female db-25 w/female db-25 ldm2485b-p male db-9 w/terminal block ldm2485b-s female db-9 w/ terminal block ldm2485b-pj1 male db-9 w/rj-11 jack ldm2485b-sj1 female db-9 w/rj-11 jack ldm2485b-pj4 male db-9 w/rj-45 jack ldm2485b-sj4 female db-9 w/rj-45 jack features available with db-25 (rs-232) or db-9 (eia-574) interface conforms to the eia rs-485 standard operates asynchronously, point-to- point or multipoint, over 2 or 4 wires up to 50 terminal drops in a multipoint polling environment data rates to 115,200 bps range up to 9.0 mi (14.5 km) data plus one control signal passed in each direction selectable rts-cts delay able to operate with or without echo carrier may be continuous or controlled by rts no ac power or batteries required 600 watts of silicon avalanche diode surge protection C st andard ldm2485a and ldm2485b signal powered high speed rs-232 to rs-485 converters dataforths model ldm2485a & ldm2485b high speed, rs-232 to rs- 485 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. specifications model ldm2485a/ldm2485b transmission format asynchronous data rate range 0-115.2k bps data rate bps 115.2k 38.4k 9.6k 1.2k distance mi 2.6 2.9 4.6 9.0 km 4.2 4.7 7.4 14.5 rs-232/eia-574 interface db-25/db-9 rs-485 interface options rj-11 or rj-45 jack or terminal block with strain relief transmit line 2, 4 wire unconditioned twisted pair transmit mode 4-wire, full or half duplex; 2-wire half duplex control signals 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. rts/cts delay 0 or 8 msec carrier the carrier is switch selected either continuous operation or controlled by rts surge protection 600w power dissipation at 1 ms power draws operating power from the rs-232 or eia-574 data and control signals; no ac power or batteries required. temperature 32 to 122 f (0 to 50 c) size: 2485a 2.66" x 2.10" x 0.73" (68 x 53 x 19 mm) size: 2485b 2.50" x 1.20" x 0.75" (64 x 31 x 19 mm) weight 2 oz (57 gm)/1.4 oz (40 gm) dataforth does not authorize or warrant its products for use in life support/critical applications.
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