B&B Electronics 485BAT3 - Datasheet - Manual

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Battery powered Serial Converter
485BAT3
three versatile Powering options
Model 485BAT3 features power versatility, making it perfect for field testing
solutions. It can be powered in three ways: batteries, port powered, or
external power supply.
Use the battery power option with a low power RS-232 port (found on
many laptops) or no handshake lines or when it is inconvenient to use a
power supply. The 485BAT3 will draw as much power as possible from the
RS-232 port and get any additional current necessary from the batteries.
If you have a full power port and all your handshake lines, turn off
the battery switch. This allows you to run full port powering and saves
the batteries for emergencies. Note: The battery On-Off switch conserves
battery life. It does not turn on and off all power to the unit.
Lastly, a stripped and tinned +12VDC external power supply may be used.
Simply attach it to the terminal blocks and plug it in.
485BAT3 converts unbalanced RS-232 signals to balanced RS-422 or
RS-485 signals. RS-485 is an enhanced version of the RS-422 standard,
allowing multiple drivers and receivers on a 2-wire system.
• 3 Power Options: Battery (2-AAA), RS-232 handshake lines, or
external power supply
• 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
proDuCt FeatureS
aCCeSSorieS
485PS2 - 12 VDC (wired) power supply, 100 mA, 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 wall power supply, jack, UK BS-1363 plug
9PAMF6 - DB9 male to DB9 female adapter cable, 1.8 m (6 ft.)
9PMTT - RS-232 mini tester
orDering inFormation
Model
nuMber
rs-232
ConneCtor
rs-485
ConneCtor
outPut
oPtional Power
suPPly
485BAT3 DB9 Female Terminal Block
RS-485 2 or
4-wire or RS-422
(2) AAA batteries
or port powered or
external source
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.
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