BB ELECTRONICS CATALOG (2010)

Serial
Port Powered RS-485 Converters
Converts RS-232 to RS-485 quickly and easily
No power supply or software drivers needed!
• Powered from RS-232 handshake lines – no power supply needed!
• Extend RS-232 signals to 4,000 feet (1.2 km)
• Communicate at baud rates to 115.2 kbps
• Automatic Send Data Control – no software drivers to install or manage
232 485
MODBUS
These port-powered converters quickly and easily change TD and RD RS-232 lines to RS-485 signals. All feature Automatic Send
Data Control which automatically enables the driver when data is present on the RS-232 side. Control of the driver is automatic at
speeds up to 115.2 kbps.
Converters
Our engineers know how to squeeze the last Milliwatt out of an RS-232 port to eliminate the need for external power. This popular
product family is ideal for field service, any application where another power supply adds clutter, or anywhere you need compact,
easy-to-use, economically priced serial conversion.
Choose your port powered converter by interface/connector
On Facing Page Model RS-232 Connector RS-485 Connector Output Optional Power Supply Price
Fiber
Optics
A 4WSD9R DB9 Female DB9 Female RS-485 2 or 4-wire 485PS $84
or RS-422
B 485SD9TB DB9 Female Terminal Block RS-485 2-wire 485PS2 79
Telephone
Modems
Specialty
Converters
Splitters,
Combiners,
Data Taps
SEL
C 485BAT3 DB9 Female Terminal Block RS-485 2 or 4-wire (2) AAA batteries or 485PS2 99
or RS-422
D 485SD9R DB9 Female DB9 Female RS-485 2-wire - 79
E 485LPCOR DB25 Female DB25 Male RS-485 2-wire 485PS2 79
F 485SD9RJ DB9 Female RJ-11 RS-485 2-wire - 79
G 485DRJ DB9 Female (2) RJ-11 RS-485 2 or 4-wire - 79
H 4WSD9TB DB9 Female Terminal Block RS-485 2 or 4-wire 485PS 84
or RS-422
You May Also Need…
485PS 120 VAC to 12 VDC @ 100 mA (barrel connector) power supply $15
485PS2 120 VAC to 12 VDC @ 100 mA (wired) power supply 15
Why offer “optional” power supplies with port powered converters?
Simply put, all RS-232 ports are not created equal. Many laptop PC’s for example, deliberately reduce power to the RS-232 port to
save the battery. And, if you are working at the distance limits of RS-422 or 485, you might need an extra boost. It’s also possible
that your application does not include and RS-232 “handshake line” which carries most of the power. For the majority of
applications though, port power is all our efficient converters need to get the job done. We just want to be sure that you’re covered,
no matter what.
Data
Switches
Cards
Technical Support Note
Kelly On Why Send Data Control (SDC) Makes Serial Conversion Easier
As operating systems become more complex, it is increasingly difficult to control an RS-485 driver
with standard software and the RTS line. This is especially true in Windows and multi-tasking
operating systems. With B&B’s Automatic Send Data Control circuit, driver control is in the converter
hardware, so you don’t have to work with software at all. The circuit monitors data flow and enables
the driver during transmission and automatically disables it when no data is being sent. There is no
need to rework software or install new drivers. Most B&B Electronics RS-232 to RS-485 converters and
RS-485 serial cards include Automatic Send Data Control.
Look for this symbol indicating products with Send Data Control circuitry.
See our RS-485 Reference Guides at: www.bb-elec.com/technical_library.asp
AUTOMATIC
SEND DATA
CONTROL
See Page 18
18
www.bb-elec.com
815.433.5100