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Key Features

Converts RS-232 signals to RS-485 signals
Extends data communication up to 1219 meters (4000 ft)
Multi-drop capability - up to 32 receivers per driver
Pluggable terminal block for easy wiring
Data rate: up to 115.2 kbps
Quick, easy inline installation
12 VDC power supply required (not included, sold separately)

B+B SMARTWORX Connector Adapters

9PIN/TB 485CONV W/SD CTRL

Mfr # 485PTBR SKU 4791385 UPC 0835788110883

$82.05 MSRP $101.40 Save 19%

Regular price saves you $19.35 against MSRP.

Available

Product Overview

9PIN/TB 485CONV W/SD CTRL

B+B SmartWorx (485PTBR) Connector Adapters
B+B SmartWorx RS-232 to RS-485 Converter with Pluggable Terminal Block - 1 x DB-9 RS-232 Serial - Female - 1 x Terminal Block RS-485 Serial
B+B SmartWorx RS-232 to RS-485 Converter with Pluggable Terminal Block
1 x DB-9 RS-232 Serial - Female - 1 x Terminal Block RS-485 Serial

Technical Specifications

Product Type	Data Transfer Adapter
Manufacturer Part Number	485PTBR
Weight (Approximate)	1.06 oz
Manufacturer	Advantech Co., Ltd
Product Model	BB-485PTBR
Product Name	RS-232 to RS-485 Converter with Pluggable Terminal Block
Brand Name	B+B SmartWorx
Environmentally Friendly	Yes
Connector Type on First End	DB-9 RS-232 Serial - Female
Connector Type on Second End	Terminal Block RS-485 Serial
Adapter Type	Serial
Connector on First End Details	1 x DB-9 RS-232 Serial - Female
Connector on Second End Details	1 x Terminal Block RS-485 Serial
Product Material	Plastic
Environmental Compliance	Restriction of Hazardous Substances (RoHS)
Environmental Compliance	Waste Electrical and Electronic Equipment Directive (WEEE)

Marketing Information

Model BB-485PTBR converts unbalanced RS-232 signals to balanced, full or half-duplex 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 RS-232 port has a female DB9 connector with pins 2(RD), 3(TD), and 5(SG) supported. Pins 7(RTS) and 8(CTS) are tied together. Also pins 6(DSR), 1(CD), and 4(DTR) are tied together, but not passed through the converter. The RS-485 port has an 8-position pluggable terminal block connector.

Baud Rate

Model BB-485PTBR supports baud rates from 300 bps to 115.2 Kbps. In order to change the baud rate, a resistor and possibly a capacitor must be changed. By looking up the selected baud rate on Table 1 the resistor and capacitor value can be determined. Remove R3 and C7 from the printed circuit board. Place new components in the R2 and C6 locations.

Biasing Resistors

The biasing resistors R5 and R7 can also be altered. Model BB-485PTBR comes standard with 4.7K biasing resistors. To change the value of biasing resistors, remove R5 and R7 and replace with new value in locations R4 and R6.

Termination Resistor

The termination resistor is located at R8. A termination resistor can be placed in the R8 location and a jumper wire placed from the terminal location to RD(B). B+B SmartWorx recommends a 100-120 Ohm resistor for termination.

Constant Receiver Enable

The BB-485PTBR is factory-set with the receiver disabled during transmission. It can be set for constant receiver enable. When R9 is removed, the receiver is in constant receive mode (four-wire). When R9 is in the circuit it is in half-duplex mode (two-wire).

Data Line Polarity

The polarity of the two RS-485 lines must be correct. With no data being sent, the RS-232 line should be negative and the RS-485 "A" terminal should be negative with respect to the "B" terminal. If your equipment uses a "+" and "-" naming scheme, in most cases, the "A" line will be connected to the "-" and the "B" line will be connected to the "+".