B&B Electronics 485SD9TB Manual de usuario

P#9145-r1_485SD9TB-0812-1/2

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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&BELECTRONICS

Model 485SD9TB

Port-Powered RS-485 Converter

The 485SD9TB is a port-powered two-channel RS-232 to RS-485 converter. It converts the TD and RD RS-232 lines to

balanced half-duplex RS-485 signals. The unit is powered from the RS-232 data and handshake lines whether the lines

are high or low. An external power supply can be connected to two terminals on the RS-485 connector if no handshake

lines are available. The 485SD9TB has a DB-9 female connector on the RS-232 side and a terminal block connector on

the RS-485 side.

RS-232 Side:

Connector: DB-9 Female.

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-485 Side:

Connector: Terminal Block

Signals: Half-duplex two-wire operation only.

Automatic control circuit enables driver only when transmitting.

Receiver is disabled when transmitting to prevent echo back to RS-232 device.

Can transmit up to 4000 feet at 115.2k baud.

Power Requirements

No external power required if two RS-232 output handshake lines are available.

External 12VDC can be applied to pins on the RS-485 side between terminals +12VDC and GND if handshake lines are

not available.

35mA current draw maximum under normal operation when externally powered.

NOTE: When using an external supply, the supply should be connected only to specifically labeled

power inputs (power jack, terminal block, etc.). Connecting an external power supply to the

handshake lines may damage the unit. Contact technical support for more information on

connecting an external power supply to the handshake lines.

Dimensions: 3.50 x 1.34 x .67 in (8.9 x 3.4 x 1.7 cm)

Although the 485SD9TB uses handshake lines to power the converter, no handshaking is required to control the RS-

485 driver. 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. See B&B Electronics’ RS-422/RS-485

Application Note for more information on termination and DC biasing of an RS-485 network.

The 485SD9TB has an internal connection to prevent data transmitted from the RS-232 port from being echoed back to

the RS-232 port. The 485SD9TB is used as a two wire (half duplex) RS-485 converter.

P#9145-r1_485SD9TB-0812-2/2

www.bb-elec.com

orders@bb

elec.com

support@bb

elec.com

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&BELECTRONICS

DECLARATION OF CONFORMITY

Manufacturer’s Name: B&B Electronics Manufacturing Company

Manufacturer’s Address: P.O. Box 1040

707 Dayton Road

Ottawa, IL 61350 USA

Model Number: 485SD9TB

Description: Port-Powered RS-485 Converter

Type: Light industrial ITE equipment

Application of Council Directive: 89/336/EEC

Standards: EN 55022

EN 61000-6-1

EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)

Robert M. Paratore, Director of Engineering

Mouser Electronics

Authorized Distributor

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