B+B SmartWorx RS-232 to RS-485 Converter with Pluggable Terminal Block

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

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B+B SmartWorx BB-485PTBR

B+B SmartWorx BB-485PTBR Data Transfer Adapter

About the B+B SmartWorx BB-485PTBR

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 "+".

Technical Specifications of the B+B SmartWorx BB-

General Information

Manufacturer Advantech Co., Ltd
Manufacturer Part Number 485PTBR
Manufacturer Website Address http://www.advantech.com
Brand Name B+B SmartWorx
Product Model BB-485PTBR
Product Name RS-232 to RS-485 Converter with Pluggable Terminal Block
Product Type Data Transfer Adapter

Technical Information

Adapter Type Serial
Connector Gender on First End Female
Connector Type on First End DB-9 RS-232 Serial - Female
Connector on First End Details 1 x DB-9 RS-232 Serial - Female
Connector Type on Second End Terminal Block RS-485 Serial
Connector on Second End Details 1 x Terminal Block RS-485 Serial

Physical Characteristics

Product Material Plastic
Material Details

Plastic - Enclosure

Weight (Approximate) 1.06 oz

Miscellaneous

Green Compliant Yes
Environmental Compliance
  • Restriction of Hazardous Substances (RoHS)
  • Waste Electrical and Electronic Equipment Directive (WEEE)
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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

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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

This question will be posted on a public forum. Do not include HTML, references to other retailers, pricing, personal information, or any profane, inflammatory, or copyrighted comments