B&B Electronics 485SD9R - Datasheet - Manual

www
.
bb
-
elec
.
com
|
port powered rS-232/485 Converters
485SD9R, 485SD9RJ, 485SD9TB
These port-powered, two channel converters allow your computer to
communicate longer distances by converting TD and RD RS-232 lines to
RS-485 signals. RS-485 also provides multi-drop capability.
All converters feature Automatic Send Data Control which 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 are powered by the RS-232 port DTR and RTS handshake lines,
or by an optional external 12 VDC power supply. When port powered, at
least one of these handshake lines must be asserted (high) to power the
unit. By raising RTS, the RS-485 driver is enabled and the RS-485 receiver
is disabled. By lowering RTS, the RS-485 driver is disabled and the RS-485
receiver is enabled.
These converters are suitable for field service, where a power supply would
add clutter, or anywhere you need compact, easy-to-use, economically
priced serial conversion.
• Extend RS-232 data signals up to 1.2 km (4,000 ft.)
• Change RS-232 TD and RD to RS-485 signals
• Automatic Send Data Control - no software drivers necessary
• Baud rates up to 115.2 kbps
• Powered from RS-232 handshake lines - no power
supply required
proDuCt FeatureS
aCCeSSorieS
485PS2 - 120 VAC to 12 VDC power supply, 100 mA, tinned leads, USA
PS1EU-1000 - 220-240 VAC to 12 VDC power supply, 1A, tinned leads, Euro
CEEE7/7 plug
PS1UK-1000 - 220-240 VAC to 12 VDC power supply, 1A, tinned leads,
UK BS-1353 plug
9PAMF6 - DB9 male to DB9 female adapter cable, 6 ft. (1.8 m)
orDering inFormation
Model
nuMber
rs-232
ConneCtor
rs-485
ConneCtor
outPut
oPtional
Power
suPPly
485SD9R DB9 Female DB9 Female RS-485 2-wire
485SD9RJ DB9 Female RJ11 RS-485 2-wire
485SD9TB DB9 Female Terminal Block RS-485 2-wire ✔
automatic send data Control explained
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
Electronics’ Automatic Send Data Control circuit, driver control is in the
converter hardware, so you do not 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.
why use an “optional” power supply
with a port-powered converter?
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. For the majority of applications though, the converter’s
port powering is sufficient to accomplish the task.
Learn More!
reaD on!
Port Powered Converter FAQ
www.bb-elec.com/PortPowerFAQ
*Carrier data charges may apply.
485SD9R, 485SD9RJ, 485SD9TB_3713ds