485LDRC9-1909ds page 1/2
©2009 B&B Electronics. All rights reserved
PRODUCT INFORMATION 485LDRC9
Industrial RS-232 to RS-422/485 Converter 9 Extend Data up to 4000 ft / 1.2 km
9 2000V Optically Isolated Data Lines
9 Wide Operating Temperature
9 Modbus ASCII/RTU
9 Automatic Send Data Control
9 Switchable 120Ω Termination
The 485LDRC9 is an optically isolated RS-232
Isolation
Lines Protected
Method
Rating
Surge Suppression
Lines Protected
Method
Rating
to RS-422/485 Converter. RS-232 signals interface
through a convenient DB9 F connector or through a
terminal block. RS-422/485 signals and the power
inputs connect to the terminal block. Built in Send
Data Control circuitry eliminates the need for
Response Time
Industrial Bus
external software to control handshake signals.
suppression, ensures that the connected equipment
is protected even in the harshest of environments.
The converter operates on externally sourced
10 – 30 VDC power. The enclosure has a DIN rail
mount that is designed to fit easily on a standard
RD (RED)
B&B ELECTRONICS
35mm rail. The 485LDRC9 is ideal for your critical
Enclosure
Material
IP Rating
Dimensions
Mounting
industrial communications needs.
Specifications
Termination
RS-485
Connector
Signals
Modes
Termination
Data Lines
TVS
7.5V bi-directional
avalanche breakdown device
500W peak power dissipation
< 1 pico-second
MODBUS ASCII/RTU
Power
Connector
Voltage
Power Consumption
Source
Terminal Blocks
Wire Size
Torque
LED Indicators
Power (RED)
TD (RED)
Optically isolated data lines, with 500W surge
RS-232
Connector
Signals
Connector
Signals
RS-422
Connector
Signals
Data Lines
Optical
2000 V
DB9 F (DCE)
TD, RD, GND
Terminal Block
TD, RD, GND
Terminal Block
TDA(-), TDB(+), RDA(-),
RDB(+), GND
120Ω (Switchable)
Terminal Block
TDA(-), TDB(+), RDA(-),
RDB(+), GND
2-Wire and 4-Wire
120Ω (Switchable)
Environmental
Operating Temperature
Storage Temperature
Operating Humidity
MTBF
MTBF Calculation Method
Agency Approvals
Ordering Information
Model Number
Power Supply
Panel Mount Adapter
Serial Cables
Terminal Block
10 to 30 VDC
0.5 W
External
24 to 14 AWG
4 kgf-cm
On when power applied
Flashes when RS-422/485
data sent
Flashes when RS-422/485
data received
Plastic
30
1.0 x 3.1 x 3.7 in (2.5 x 7.9 x 9.5 cm)
35 mm DIN (Panel Mount Adapter
is available)
-40 to 80 C (-40 to 176 F)
-40 to 85 C (-40 to 185 F)
0 to 95% Non-condensing
257448 hours
Parts Count Reliability Prediction
CE, FCC
Declaration of Conformity available
for download at www.bb.elec.com
485LDRC9
An external source is required.
DRPM25
Various serial cables are available
visit www.bb-elec.com
International Headquarters: 815-433-5100 Fax 433-5104 www.bb-elec.com
European Headquarters: +353 91 792444 Fax +353 91 792445 www.bb-europe.com B&B ELECTRONICS
PRODUCT INFORMATION 485LDRC9-1909ds page 2/2
©2009 B&B Electronics. All rights reserved
International Headquarters: 815-433-5100 Fax 433-5104 www.bb-elec.com
European Headquarters: +353 91 792444 Fax +353 91 792445 www.bb-europe.com 
Download PDF