Advantech B+B SmartWorx 485DRCI-PH Quick Start Manual page 2

1
Product Overview
Power Data DB9 Terminal
LED LEDs Port Block
Ground DIP 10 to 48 VDC
Lug Switches 1.9 W max.
+
Grounding the unit is recommended.
Connect a grounding wire from the ground lug
to a good source of Earth Ground.
2
Set the DIP Switches
COMMUNICATIONS MODE
Switch 1
RS-485 2-Wire Half-Duplex ON ON
RS-485 4-Wire Full-Duplex ON OFF
RS-422 Full-Duplex OFF OFF
BUILT-IN TERMINATION RESISTOR
Use Built-in 120Ω Termination
Use External or No Termination
BUILT-IN TRANSMIT BIAS RESISTOR
Data
Use External or No Bias Resistor
LEDs
Use Built-in 1.2KΩ Transmit Bias Resistor
BUILT-IN RECEIVE BIAS RESISTOR
Use External or No Bias Resistor
Use Built-in 1.2KΩ Receive Bias Resistor
+
Switch position 8 is not used.
For an explanation of RS-485 termination and biasing requirements,
refer to B+B SmartWorx' RS-422/485 Application Note. This publica-
tion can be downloaded at: www.advantech-bb.com
3
Wire the Converter
2 3 4
ON ON
TERMINAL
OFF OFF
OFF OFF
A
B
SWITCH
C
5
D
ON
E
OFF
SWITCH
6
ON
OFF
SWITCH
7
ON
OFF
+ +
DB9 Pinouts
RS-485 2-WIRE RS-422/485 4-WIRE
*** TDA (-)
*** TDB (+)
Data A (-) RDA (-)
Data B (+) RDB (+)
GND GND
DIP SWITCH RS-422/485 4-WIRE
1 2 3 4 5
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
1 2 3 4 5
ON ON ON ON x
Positions 5, 6, 7 are used for termination and biasing.
4
Loopback 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 a similar program, con-
nect to the appropriate COM port.
• Turn off HyperTerminal local Echo.
• Transmit data. The same data should be re-
turned. When data is sent and looped back, the
TD and RD LEDs will blink on both ports.
5
Check LEDs
LEDs
Power
Red = ON when power is applied.
LED
Data LEDs Green = LEDs flash when data is present on the port.
6 7
*** ***
6 7
x x