Bb-electronics 4WSD9R - Datasheet User Manual download pdf

4WSD9R0712-1/4

www.bb-elec.com [email protected] [email protected]

International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104

European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445

PRODUCT INFORMATION B&B ELECTRONICS

Table 1:

RS-232 Pinout

Pin # Signal

1 DCD

2 RD

3 TD

4 DTR

5 GND

6 DSR

7 RTS

8 CTS

Table 2:

RS-422/485 Pinout

Pin # Signal

2 RD(A)-

3 TD(B)+

4 GND

6 GND

7 RD(B)+

8 TD(A)-

Model 4WSD9R

Universal Converter

Covers All the Bases-

RS-232 to 4-wire RS-422,

2-wire or 4-wire RS-485

The 4WSD9R Universal Converter is a port-powered or externally powered two-channel RS-232 to RS-422/RS-485

converter. It converts TD and RD RS-232 lines to balanced RS-422 or RS-485 signals. RS-485 is an enhanced version

of the RS-422 standard, allowing multiple drivers and receivers on a two-wire system. The unit is powered from the RS-

232 data and handshake lines whether the lines are high or low. Or, if there is not enough power on the port, it can be

and the RS-485 side. The RS-232 connector is configured as DCE (like a modem).

RS-232 Side:

Connector: DB-9 female (DCE)

Signals: Passes through pins 3 (TD) and 2 (RD)

Pins 7 (RTS) and 8 (CTS) are tied together

Pins 4 (DTR), 6 (DSR), and 1 (CD) are tied together

RS-422/RS-485 Side:

Connector: DB-9 female

Signals: RS-485 2-wire half-duplex, or RS-485 4-wire full-duplex,

or RS-422 4-wire full-duplex depending on switch configurations

Automatic control circuit enables driver only when transmitting

Receiver can be disabled when transmitting to prevent echo back to RS-232 device when in 2-wire mode

Data Rates: Up to 115.2 kbps

Distance: Externally powered transmits up to 4000 ft (1200 m) at 115.2 kbps (may be less with port powering)

Dimensions: 3.0 x 1.6 x 0.8 in (7.8 x 4.3 x 2.0 cm)

Power

No external power is required if two RS-232 output handshake lines are available and the cable

run is short. If the handshake lines are raised and no termination is used, the power efficiency is

greatly increased. Less than 3mA is required to operate the 4WSD9R plus the load current. For

applications that do not have handshake lines or require a large load current, power may be

externally supplied with a +12VDC power supply with a 2.5mm plug (tip positive).

RS-232 Operations

The RS-232 port has a female DB9 connector with pins 2 (RD), 3 (TD), and 5 (Signal Ground)

supported. Pins 7 (RTS) and 8 (CTS) are tied together, and pins 6 (DSR), 1 (DCD), and 4

(DTR) are also tied together. Any incoming data lines in either the high or low state are used to

port power the 4WSD9R. The more handshake lines available, the more likely the unit can be

port powered. Table 1 shows the RS-232 pinout.

RS-422/485 Operations

Although the 4WSD9R can use handshake lines to power the converter, no handshaking is

required to control the RS-422/RS-485 driver. With switch 1 set to RS-422, the driver is

always enabled. When switch 1 is in the RS-485 position, the RS-485 driver is automatically

enabled during each spacing state on the RS-232 side. During the marking or idle state, the

RS-485 driver is disabled and the data lines are held in the marking state by the 4.7K Ohm pull-

up and pull-down resistors. The value of these resistors may need to be changed to a different

value when termination is used in order to maintain the proper DC bias during the idle state.

1 2 3 4

Summary of Contents

Page 1 - 2-wire or 4-wire RS-485

Page 2 - RS-485 4-Wire Full-Duplex

Page 3 - RS-422 4-Wire Full-Duplex:

Page 4 - DECLARATION OF CONFORMITY

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