B&B Electronics 422PP9R - Datasheet - Manual

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port powered rS-232/422 Converters
422PP9R, 422PP9TB
These port-powered, two-channel converters change TD and RD RS-232
lines to balanced RS-422 signals extending communication distances up
to 1.2 km (4,000 ft.). Automatic Send Data Control feature enables the RS-
422 driver when data is present on the RS-232 side. Control of the driver
is automatic at rates up to 115.2 kbps. The RS-422 driver and receiver are
always enabled.
With port-powering, no power supply is required. Power is derived from the
DTR and RTS RS-232 handshake control lines. If port-powering the unit, at
least one handshake line must be present, in either the positive or negative
voltage state. This permits use in applications without worrying about
software control of the handshake lines. Can also be powered externally.
Converters are configured to transmit both directions in an RS-232 and
RS-422 system. RS-232 pinout connects directly to a computer’s COM port
or any other DTE device. Connections to the RS-422 side are made through
the terminal blocks.
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 balanced RS-422 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
422PS2 - 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.)
orDering inFormation
Model
nuMber
rs-232
ConneCtor
rs-422
ConneCtor
outPut
oPtional
Power
suPPly
422PP9R DB9 Female DB9 Female RS-422
422PP9TB DB9 Female Terminal Block RS-422 ✔
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.
422PP9R, 422PP9TB_3713ds