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LDM2485 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part No. LDM2485
Description  Signal Powered High Speed RS-232 to RS-485 Converters
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Maker  ETC [List of Unclassifed Manufacturers]
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LDM2485 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers

   
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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
Á AVAILABLE WITH DB-25 (RS-232) OR
DB-9 (EIA-574) INTERFACE
Á CONFORMS TO THE EIA RS-485 STANDARD
Á OPERATES ASYNCHRONOUSLY, POINT-TO-
POINT OR MULTIPOINT, OVER 2 OR 4 WIRES
Á UP TO 50 TERMINAL DROPS IN A MULTIPOINT
POLLING ENVIRONMENT
Á DATA RATES TO 115,200 BPS
Á RANGE UP TO 9.0 MI (14.5 KM)
Á DATA PLUS ONE CONTROL SIGNAL PASSED IN
EACH DIRECTION
Á SELECTABLE RTS-CTS DELAY
Á ABLE TO OPERATE WITH OR WITHOUT “ECHO”
Á CARRIER MAY BE CONTINUOUS OR
“CONTROLLED BY RTS”
Á NO AC POWER OR BATTERIES REQUIRED
Á 600 WATTS OF SILICON AVALANCHE DIODE
SURGE PROTECTION –STANDARD
LDM2485A and
LDM2485B
Signal Powered High Speed
RS-232 to RS-485 Converters
Dataforth’s 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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