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Product Overview
Top View
Bottom View
(RS-232 & Power Side)
(RS-422/485 Side)
Terminal Block
Connectors
A – F
DB9 Female
Pins
Note:
Terminal block and DIP switch settings located on product.
1
Connect RS-232 Device
485LDRC9
Your Device
485LDRC9
TD
D
E
F
D
RD
A
B
C
A
GND
DTE
Computer
• Use a straight-through DB9 to DB9 if you are
connecting to a computer (DTE).
• Use a cross-over (null modem) DB9 to DB9 if you are
not connecting to a computer. (DCE)
+
Additional technical notes on RS-232 DTE & DCE
connections are available on the website.
2
Set RS-422/485 Converter Side
BB-485LDRC9
G
H
Terminal Block
Connectors
K
L
G – M
DIP
Switches
1 – 8
RS-485 2-Wire Half-Duplex
RS-485 4-Wire Full-Duplex
RS-422 Full-Duplex
+
Additional RS-422/485 technical notes are
available on the website.
3
Set the Dipswitch Settings
for Baud Rate
Your Device
TD
E
F
RD
B
C
GND
+
For baud rates not listed above, see the website.
DCE
Field Device
Termination Switch:
4
Set to OFF (recommended)
2-Wire 485
4-Wire 485/422
Your Device
BB-485LDRC9
DATA
B (+)
J
G
H
J
DATA
A (-)
M
K
L
M
GND
SW-1
SW-2
SW-3
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
SW-6
SW-7
SW-8
2400
OFF
OFF
ON
4800
OFF
ON
OFF
9600
ON
OFF
OFF
19.2K
ON
ON
ON
Use the 120Ω
Built-in Termination
Use External or
No Termination
Switch 5
+
Termination technical notes are available
on the website.
5
Connect Your Power Supply
Your Device
External Power
Supply
RDA
(-)
RDB
(+)
TDA
(-)
TDB
(+)
GND
SW-4
ON
6
OFF
Loopback Test
OFF
• Configure for RS-485 4-wire, 9600 baud.
• Jumper terminals H to L, and G to K.
• Connect a PC to RS-232 port (see Step 1).
• Using HyperTerminal or similar program,
connect to the appropriate COM port
(remember to set the baud rate at 9600).
Turn off HyperTerminal local echo.
• Start typing. If you can see the data
Timeout (MS)
you are typing, you have a good loop-
back. If you cannot, contact Advantech
4.16
B+B Technical Support.
2.08
• LED Indicators: Power is ON when power
is applied. TD flashes when RS-422/485
1.04
data is sent. RD flashes when RS-
422/485 data is received.
0.580
7
LED Indicators
Transmit Data (Red)
Receive Data (Red)
Power (Red)
ON
+
OFF
With no devices attached, LEDs should be Off; Power On.
TIPS:
If LEDs are On before devices are attached, it may indicate that the
Termination Resistor is On.
Using termination with power ON, but no devices connected, may cause
the Receive LED to turn ON solid. The loading from the termination may
cause the Receiver Bias to go into an indeterminate state.
Terminal C:
(Ground/V (–)
Terminal F:
V (+)
Converter uses 0.5 W
Set DIP
Switches to:
L
1
ON
OFF
2
K
3
OFF
4
OFF
H
5
OFF
ON
6
G
7
OFF
8
OFF
RS-485
4-Wire
Flashing - RS-422/485 data is transmitted.
Flashing - RS-422/485 data is received.
On - when power applied.
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