Quick Start Guide

2
Label Side Signal
A(-) Data In Left TDA(-) / Data A(-)
B(+) Data In Left TDB(+) / Data B(+)
A(-) Data Out Left RDA(-) / Data A(-)
B(+) Data Out Left RDB(+) / Data B(+)
Signal GND 1 Left Signal Ground
Prot. GND 1 Left Protected Ground
GND Left Power Ground
A(-) Data Out Right RDA(-) / Data A(-)
B(+) Data Out Right RDB(+) / Data B(+)
A(-) Data In Right RDA(-) / Data A(-)
B(+) Data In Right RDB(+) / Data B(+)
Signal GND 2 Right Signal Ground
Prot. GND 2 Right Protected Ground
Product Overview
Wire the 485OP
3
Set the Jumpers
Set the Jumpers for 2 or 4-wire and for baud rate. Default
on both sides is 2-Wire, 9600. If you want to set the unit
for 4-Wire or change the baud rate, you will need a screw-
driver. Remove the 4 screws and open the unit. Set jumpers
as shown below.
1
Loopback Test
Data
LED
Connections
Data
LED
10 to 14 VDC
500 mA, 1 W
Baud
Rate
Time
(ms)
R26 & R27
(KΩ)
C15 & C16
(mfd)
JP2 & Jp4
300 33.3 330 0.1 E*1
600 16.6 160 0.1 E*1
1200 8.33 820 STD (0.01) E*1
2400 4.16 STD (430) STD (0.01) A
4800 2.08 STD (200) STD (0.01) B
9600 1.04 STD (100) STD (0.01) C
19.2 K 0.52 STD (56) STD (0.01) D
38.4 K 0.26 STD (27) STD (0.01) E
57.6 K 0.17 39 STD (0.01) E*2
115.2 K 0.087 11 STD (0.01) E*2
230.4 K 0.044 4.7 STD (0.01) E*2
460.8 K 0.022 2.2 STD (0.01) E*2
RS-485 2-Wire
RS-422/485 4-Wire
RS-485 Master 4-Wire
If you set the unit for 38.4 it will usually work at higher
baud rates. If you need a specific turnaround time go to:
http://www.bb-elec.com/Products/Serial-Connectivity/
Isolators-Repeaters/Optically-Isolated-Repeaters.aspx and
go to the tech notes.
3
Power the Unit
You can perform a loopback test by connecting the 485OP
to an RS-422 to an RS-422/485 converter, or by connect-
ing it to a USB to RS-422/485 converter.
Set the 485OP for Full duplex on both sides with the
jumpers (See step 2). Attach the 232 to 422/485 or USB
converter to 1 side of the 485OP. Jump Data In A to Data
Out A and Data in B to Data Out B on the other side
Using HyperTerminal or similar program, connect to the
appropriate COM port. Turn off Hyper Terminal local echo.
Set baud rate to 9600. Transmit data. If you can see the
data you are typing the test is successful.
DATA OUT A
DATA OUT B
DATA IN A
DATA IN B
SIGNAL GND
PROT. GND