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B&B Electronics 485OP - Quick Start Guide User Manual

Product overview, Wire the 485op, Set the jumpers

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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