B&B Electronics 485DRCI-PH User manual

1Set DIP Switches
2
Communications Mode
Switch 1 2 3 4
RS-485 2-Wire
Half Duplex ON ON ON ON
RS-485 4-Wire
Full Duplex ON OFF OFF OFF
RS-422 Full Duplex OFF OFF OFF OFF
Product Overview
Wire the Converter
SWITCH POSITION 8 IS NOT USED
For an explanation of RS-485 termination and
biasing requirements, refer to B&B Electronics’
RS-485 application note. This publication can
be downloaded at: www.bb-elec.com
Built-In Termination Resistor Switch
5
Use built-in 120Ω Termination ON
Use External or No Termination OFF
Built-In Transmit Bias Resistor Switch
6
Use External or No Bias Resistor ON
Use built-in 1.2K Ω Transmit Bias Resistor OFF
Built-In Receive Bias Resistor Switch
7
Use External or No Bias Resistor ON
Use built-in 1.2K Ω Receive Bias Resistor OFF
DB9 Pinout
DIP Switch RS-422/485 4-Wire
1234567
On/Off OFF OFF OFF *** *** ***
Position 1 = ON for RS-485, OFF for RS-422
Positions 5,6,7 are used for termination and biasing
DIP Switch RS-485 2-Wire
1234567
ON ON ON ON x x x
Positions 5,6,7 are used for termination and biasing
3Loopback Test
Configure for RS-485 Four wire. Jumper terminals A to C and
B to D. Connect a PC to the RS-232 port (see Step 3). Using
HyperTerminal or similar program, connect to the appropriate
COM port. Turn off HyperTerminal local Echo. Transmit data.
The same data should be returned. When data is sent and
looped back, the TD and RD LED’s will blink on both ports.
4Check LEDs
Data
LEDs
Power
LED
DB9
Port
Data
LEDs
Terminal
Block
DIP
Switches
10 to 48 VDC
1.9 W Max
Grounding the unit is recommended
Connect a grounding wire from the
ground lug
Ground
lug
Terminal RS-485 2-Wire RS-422/485
4-Wire
A *** TDA (-)
B *** TDB (+)
C Data A (-) RDA (-)
D Data B (+) RDB (+)
E GND GND
LEDs
Power
LED
Red. ON when power is
applied
Data
LEDs
Green, LEDs flash when data
is present on the port

Troubleshooting
Fast, Easy Answers...
Connecting a Signal Ground
(common, reference) on the RS-422/485 side. The specifications
for most RS-422 and RS-485 devices indicate that the device
can withstand a maximum VCM of -7 volts to +12 volts. The
function of the GND connection is to tie the signal grounds of
all nodes on a network to one common ground potential. This
ensures that the common mode voltage cannot exceed the
specified value.
A signal ground is required on the 485DRCI-PH because it is
an optically isolated device. If you do not have a signal ground
(common, reference) on your RS422/485 device, you can
connect to the DC power ground of your RS422/485 device.
Caution: Make sure that this is connected correctly.
Note: Do not use the shield drain wire as the
signal ground between RS-422/485 devices.
Information – UL Class 1 Div 2
1. Refer to the Nonincendive Field Wiring
Apparatus Control Drawing for important
information.
2. Power, Input / output (I/O) wiring
for the end use enclosure must be in
accordance with Class 1 Division 2 wiring
methods (Article 501.10(B) of the National
Electric Code, NFPA 70) and in accordance
with the local authority having jurisdiction.
3. Maximum ambient air temperature
85°C.
4. Temperature rating of field installed
conductors 105°C. Use Copper Wire Only.
5. These devices must be installed in end
use enclosure suitable for the location.
6. WARNING – EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY
IMPAIR SUITABILITY FOR CLASS 1,
DIVISION 2.
7. WARNING – EXPLOSION HAZARD:
DO NOT DISCONNECT EQUIPMENT
UNLESS POWER HAS BEEN SWITCHED
OFF OR THE AREA IS KNOWN TO BE
NON-HAZARDOUS.
8. WARNING – THIS APPARATUS IS
SUITABLE FOR USE IN CLASS 1 DIVISION 2,
GROUPS A, B, C, AND D OR NONHAZARDOUS
LOCATIONS ONLY.
Fast and easy on the web: www.bb-elec.com
Triple Isolated RS-232 to
RS-422/485 Converter
485DRCI-PH
Document number – pn8931_R003_485DRCI-PH_0113qsg © 2013 B&B Electronics Manufacturing Company
1-888-948-2248 | Europe: [phone]
www.bb-elec.com
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Please double check
Step 2.
You can also use your
smart phone to access
complete documentation
on our website. Simply
scan code to the right.
485DRCI-PH
Additional Items Required but Not
Included:
First Things First...
Before you begin, be sure you have
the following:
707 Dayton Road | PO Box 1040 | Ottawa, IL 61350
Phone: [phone] | Fax: [phone]
www.bb-elec.com | E-mail: [email protected]
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Quick
Start
Guide
MDR-20-24
Power Supply
http://www.bb-elec.com/Products/
Power-Supplies-Accessories/DIN-
Power-Supplies/Industrial-Slimline-
Power-Supplies.aspx
A 10 to 48 VDC Power Supply,.
(Converter draws 1.9 W Max.)