B&B Electronics 485LDRC9 Manuale utente

Documentation Number –p/n 8413R2 485LDRC9-0812qsg

Underwriters Laboratories Conditions of Acceptability –

When installed in the end-use equipment, consideration

should be given to the following:

1. The wiring terminals are suitable for factory wiring only.

2. This device is to be mounted in a suitable enclosure in

the end-product.

3. This device is suitable for operation at a maximum

surrounding air temperature as described in the

documentation.

4. These devices are intended for use in a pollution

degree 2 environment.

Input Voltage: 10 –30 VDC

Input Power: 0.5 Watts

Wire Range: 12 –24 AWG

Tightening Torque: 4 kgf-cm

Temperature rating of field installed conductors is 105 C

minimum, sized for 60 C ampacity.

Use copper wire only

Maximum surrounding ambient air temperature 80 C.

485LDRC9 Serial Converter

This Quick Start Guide

Additional Items Required but not included

oPower Supply

oRS-232 cable.

oRS-422/485 Cable.

Put

Quick Start Guide

485LDRC9

Optically Isolated RS-232 to

RS-422/485 Converter

Table 3 –Communications Mode

SW-1

SW-2

SW-3

SW-4

RS-485

2-Wire

Half Duplex

RS-485

OFF

4-Wire

Full Duplex

RS-422

OFF

Full Duplex

Table 4 –Termination Resistor

SW-5

Use the 120Ω

Built in Termination

Use External

OFF

or no termination

Table 5 –Timeout Selection

SW-6

SW-7

SW-8

Timeout

(MS)

1200

OFF

8.33

2400

OFF

4.16

4800

OFF

2.08

9600

OFF

1.04

19.2K

0.580

38.4K

OFF

0.260

57.6K

OFF

0.176

115.2K

OFF

0.0868

Timeout selections are equal to one character time at the

indicated baud rate. Setting the converter 9600 will

generally work at 9600 and higher baud rates. In RS-422

mode, timeouts are not required.

# To achieve these timeouts you must place a through -

hole resistor on the circuit board. See Step 5 for more

information.

–

Terminal Block

Signal

Direction

RS-232 Receive Data (RD)

Output

RS-232 Signal Ground (SG)

-------

Power Ground (PWR GND)

-------

RS-232 Transmit Data (TD)

Input

NOT USED

-------

10 –30 VDC Power Input

-------

RS-422/485 TD A(-)

Output

RS-422/485 TD B(+)

Output

NOT USED

-------

RS-422/485 RD A(-)

Input

RS-422/485 RD B(+)

Input

Isolated Ground

-------

DB9 F Pins (Converter is DCE)

Signal

Direction

RS-232 Receive Data (RD)

Output

RS-232 Transmit Data (TD)

Input

RS-232 Signal Ground (SG)

-------

Note: On the DB9F Connector, control signals are looped

back. Pin 1 (DCD), Pin 4 (DTR), and Pin 6 (DSR) are tied

together. Pin 7 (RTS) and Pin 8 (CTS) are tied together.

Documentation Number –p/n 8413R2 485LDRC9-0812qsg

S-

-2

. Two Wire RS-485

Configure for RS-485 Four wire, 9600 baud

Jumper terminals H to L and G to K

Connect a PC to the RS-232 port (see Step 7).

Using hyper terminal or similar program, connect to the

appropriate COM port (remember to set the baud rate

to 9600).Turn off hyper terminal local echo

Transmit data. The same data should be returned

LED Indicators: Power is ON when power is applied.

TD flashes when RS-422/485 data is sent. RD flashes

when RS-422/485 Data is received.

RS-422/ Four Wire RS-485

-h

(

)

If you need to support timeouts indicated with a # in

Step 4, Table 5, you must place a through-hole

resistor on the PCB. Place the resistor in the R-11

spot designated on the board. The R-11 location is

clearly visible on the PCB.

Table 6 –Through-hole Resistor Values

Baud Rate

Timeout (MS)

R-11 Value

1200

8.33

820 KΩ

38.4K

0.260

27 KΩ

57.6K

0.176

16 KΩ

115.2K

0.0868

8.2 KΩ

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