B&B Electronics 485DRCI Quick Start Guide
Product Overview
10 to 48 VDC, 0.2 A
RD LED
DB9 Port
Terminal
Block
TD LED
Power LED
1
Communications Mode
Switch
RS-485 2-Wire
Half Duplex
RS-485 4-Wire
Full Duplex
RS-422 Full Duplex
Built-In Termination Resistor Switch
Use built-in 120Ω Termination ON
Use External or No Termination OFF
Set DIP Switches
1 2 3 4
ON ON ON ON
ON OFF OFF OFF
OFF OFF OFF OFF
Built-In Transmit Bias Resistor Switch
6
Use External or No Bias Resistor OFF
Use built-in 1.2K Ω Transmit Bias Resistor ON
Built-In Receive Bias Resistor Switch
7
Use External or No Bias Resistor OFF
Use built-in 1.2K Ω Receive Bias Resistor ON
DB9 Pinout
2
485DRCI 485DRCI
DIP Switch RS-422/485 4-Wire
On/Off
Position 1 = ON for RS-485, OFF for RS-422
Positions 5,6,7 are used for termination and biasing
Positiobs 8 -12 are used to set baud rate
5
Wire the Converter
Your Device
GND
A
Data B (+)
B
C
Data A (+)
D
E
RS-485 2-Wire
1 2 3 4 5 6 7
OFF OFF OFF ... ... ...
DIP Switch RS-485 2-Wire
1 2 3 4 5 6 7
ON ON ON ON x x x
Positions 5,6,7 are used for termination and biasing
Positions 8 -12 are used to set baud rate
A
B
C
D
E
RS-422/485 4-Wire
Your Device
GND
RDB (+)
RDA (-)
TD B (+)
TDB (-)
3
Switch Selectable
Baud
(Kbps)
2.4 ON OFF OFF OFF OFF 4.37
4.8 OFF ON OFF OFF OFF 2.03
9.6 OFF OFF ON OFF OFF 1.02
19.2 OFF OFF OFF ON OFF 0.57
38.4 OFF OFF OFF OFF ON 0.27
Resistor Selectable
57.6 OFF 16 KΩ 0.16
115.2 OFF 8.2 KΩ 0.08
Pre-defined timeouts are set using switches 8
through 12. Resistor selectable baud rates are set
by inserting a through hole resistor (R-11) on the
circuit board. Timeout selections are equal to one
character time at the indicated baud rate. Setting the
converter to 9600 will generally work at 9600 and
higher baud rates. In RS-422 mode, timeouts are not
required.
4
485DRCI
5
LEDs
Power LED Red. ON when power is applied
Data LEDs Green, LEDs flash when data is present on the port
RS-422/485 Timeout
8 9 10 11 12
Baud
(Kbps)
1.2 OFF 820 KΩ 8.32
8 thru 12 R11 Value
Timeout
(ms)
Loopback Test
Configure for RS-485 Four wire,
9600 baud. Jumper terminals B to
A
B
C
D
E
D and C to E. Connect a PC to the
RS-232 port Using HyperTerminal
or similar program, connect to the
appropriate COM port.
(Remember to set the baud rate to
9600.) Turn off HyperTerminal local
echo. Transmit data. The same data
should be returned.
Check LEDs
Timeout
(ms)
Information – UL Class 1 Div 2
1. Power, input /output (I/O) wiring
must be in accordance with Class 1
Division 2 wiring methods [Article 501.10(B)
of the National Electric code, NFPA70]
and in accordance with the local
authority having jurisdiction.
2. Maximum ambient air temperature 80°
3. WARNING – EXPLOSION HAZARD:
SUBSTITUTION OF COMPONENTS MAY
IMPAIR SUITABLITY FOR CLASS 1, DIVISION 2.
4. WARNING – EXPLOSION HAZARD:
WHEN IN HAZARDOUS LOCATIONS,
TURNING OFF POWER BEFORE
REPLACING OR WIRING MODULES
5. WARNING – EXPLOSION HAZARD:
DO NOT DISCONNECT EQUIPMENT
UNLESS POWER HAS BEEN SWITCHED
OFF OR THE AREA IS KNOWN TO BE
NON-HAZARDOUS.
6. WARNING – THIS APPARATUS IS
SUITABLE FOR USE IN CLASS 1
DIVISION 2, GROUPS A, B, C,
AND D, OR UNCLASSIFIED AREAS.
Recommended Accessories
MDR-20-24
Power Supply
http://www.bb-elec.com/Products/
Power-Supplies-Accessories/DIN-PowerSupplies/Industrial-Slimline-PowerSupplies.aspx
485HESP
RS-485 Hi-Energy Surge
Protector w/Terminal
Blocks
http://www.bb-elec.com/Products/
Serial-Connectivity/Surge-Protection/
Heavy-Duty-Surge-Protectors.aspx
Fast, Easy Answers...
Q
S
G
485DRCI
Triple Isolated RS-232 to
RS-422/485 Converter
uick
tart
uide
Document number – pn8543_R003_ 485DRCI_0113qsg.pdf
•
Please double check
Step 1.
•
You can also use your
smart phone to access
complete documentation
on our website. Simply
scan code to the right.
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www.bb-elec.com
707 Dayton Road | PO Box 1040 | Ottawa, IL 61350
Phone: 815-433-5100 | Fax: 815-433-5109
www.bb-elec.com | E-mail: info@bb-elec.com
© 2013 B&B Elect ronics Manuf acturing Co mpany
First Things First...
Before you begin, be sure you have
the following:
485DRCI
Additional Items Required but Not
Included:
A 10 to 48 VDC Power Supply, 0.2A.
RS-232 cable. The converter is a
DCE device.
RS-422/485 Cable
Fast and easy on the web:
www.bb-elec.com
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