485LPCOR

485LPCOR Datasheet

485LPCOR-0812 -1/2

Part	Datasheet
485LPCOR	485LPCOR (pdf)

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B&B ELECTRONICS 485LPCOR-0812 -1/2 2003 by B&B Electronics. All rights reserved. Model 485LPCOR Port-Powered RS-485 Converter The 485LPCOR 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 pins on the RS-485 connector if no handshake lines are available. The 485LPCOR has a DB-25 female connector on the RS-232 side and a DB-25 male connector on the RS-485 side. Robert M. Paratore, Director of Engineering RS-232 Side Connector DB-25 Female Signals Passes through pins 2 TD and 3 RD . Pins 4 RTS and 5 CTS are tied together. Pins 20 DTR , 6 DSR , and 8 CD are tied together. RS-485 Side Connector DB-25 Male 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. 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 485LPCOR 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 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 pins 25 + and 12 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 x in x cm Connections and Operation To DB-25 RS-232 DTE device: To DB-25 RS-232 DCE device: To RS-485 device or network: PRODUCT INFORMATION Can use 25-pin straight through cable. Can use 25-pin cable that crosses pins 2 & 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 B&B ELECTRONICS 485LPCOR-0812 -2/2 2003 by B&B Electronics. All rights reserved. Pin one is also connected straight through on the 485LPCOR from the RS-232 side to the RS-485 side so that the shield can be passed through to earth ground if desired. It is recommended that shielded cable be used and that the shield be connected to earth ground at one point in the system. See B&B Electronics’ RS-422/RS-485 Application Note for further information on shielding. Although the 485LPCOR uses the handshake lines to power the converter, no handshaking is required to control the RS485 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 RS485 network. The 485LPCOR has an internal connection to prevent data transmitted from the RS-232 port from being echoed back to the RS-232 port. The connection can be cut to have the receiver always enabled. See Figure After the connection is cut, a jumper wire from pin 18 to pin 21 can be installed to disable the receiver during transmission. 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

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B&B ELECTRONICS
485LPCOR-0812 -1/2
2003 by B&B Electronics. All rights reserved.

Model 485LPCOR

Port-Powered RS-485 Converter

The 485LPCOR 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 pins on the RS-485 connector if no handshake lines are available. The 485LPCOR has a DB-25 female connector on the RS-232 side and a DB-25 male connector on the RS-485 side.

Robert M. Paratore, Director of Engineering RS-232 Side Connector DB-25 Female Signals Passes through pins 2 TD and 3 RD .

Pins 4 RTS and 5 CTS are tied together. Pins 20 DTR , 6 DSR , and 8 CD
are tied together. RS-485 Side Connector DB-25 Male 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.

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
485LPCOR

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

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 pins 25 + and 12 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 x in x cm

Connections and Operation

To DB-25 RS-232 DTE device:

To DB-25 RS-232 DCE device:

To RS-485 device or network:

PRODUCT INFORMATION

Can use 25-pin straight through cable. Can use 25-pin cable that crosses pins 2 &

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

B&B ELECTRONICS
485LPCOR-0812 -2/2
2003 by B&B Electronics. All rights reserved.

Pin one is also connected straight through on the 485LPCOR from the RS-232 side to the RS-485 side so that the shield can be passed through to earth ground if desired. It is recommended that shielded cable be used and that the shield be connected to earth ground at one point in the system. See B&B Electronics’ RS-422/RS-485 Application Note for further information on shielding. Although the 485LPCOR uses the handshake lines to power the converter, no handshaking is required to control the RS485 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 RS485 network. The 485LPCOR has an internal connection to prevent data transmitted from the RS-232 port from being echoed back to the RS-232 port. The connection can be cut to have the receiver always enabled. See Figure After the connection is cut, a jumper wire from pin 18 to pin 21 can be installed to disable the receiver during transmission.

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

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Datasheet ID: 485LPCOR 521487