B&B Electronics 485LP9R - Datasheet User Manual
Page 2
Document No. 485LP9R1712 - pg. 2/2
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International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104
European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445
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Biasing Resistors
The biasing resistors for the RS-485 receiver are 4.7K Ohm resistors. These resistors are labeled R1 and
R6 (See Figure 2). Refer to B&B Electronics RS-422/485 Application Note for further information on biasing.
Figure 2
Specifications
Data Rate:
115.2K Baud max.
Power: Port Powered from RTS and DTR.
Note: If external power is required, apply power to DTR (4) and SG (5). Source must supply greater than 6VDC
and current limited to 40mA
NOTE: When using an external supply, the supply should be connected only to specifically labeled power
inputs (power jack, terminal block, etc.). Connecting an external power supply to the handshake lines may
damage the unit. Contact technical support for more information on connecting an external power supply
to the handshake lines.
Signal
DB-9S Pin #
Transmit Data A (-)
8
Transmit Data B (+)
3
Receive Data A (-)
2
Receive Data B (+)
7
Signal Ground
4, 6
DECLARATION OF CONFORMITY
Manufacturer’s Name:
B&B Electronics Manufacturing Company
Manufacturer’s Address:
P.O. Box 1040
707 Dayton Road
Ottawa, IL 61350 USA
Model Number:
485LP9R
Description:
9-Pin Port-Powered RS-485 Converter
Type:
Light industrial ITE equipment
Application of Council Directive:
89/336/EEC
Standards:
EN 50082-1 (IEC 801-2, IEC 801-3, IEC 801-4)
EN 50081-1 (EN 55022, IEC 1000-4-2)
EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)
ENV 50204
EN 55024
Robert M. Paratore, Director of Engineering