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The OMG-CONV-485 interface
converter allows a standard RS-232
port to communicate with an
individual RS-422 device or with
multiple devices within an RS-485
network. The OMB-CONV-485
supports RS-422 full duplex mode as
well as RS-485 full or half-duplex
master and slave modes. This gives
the user flexibility in configuring the
device to meet their specific
application needs. Onboard LED’s
are included to indicate that the
device is properly powered and also
illuminate when the device is
transmitting and receiving to assist in
verifying acceptable communications.
A six-position screw terminal block on
the board provides connection to
external devices. Provisions for strain
relief are made within the case by a
cable clamp/screw combination. This
eliminates unwanted wire disconnects
once the screw terminals are wired.
The OMB-CONV-485-ISO is an
isolated version of the OMB-CONV-
485. Isolation is important in
installations where the equipment
connected to the PC is either
located far from the host system, or
on a different power transformer
circuit. Isolation on the OMB-CONV485-ISO eliminates the effects of
ground loop current, a commonly
neglected and misunderstood
phenomenon that leads to data
errors and the destruction of
communications equipment.
The Auto Baud feature allows the
device to operate without the
presence of RTS software. This
reduces system overhead and allows
the OMB-CONV-485 to operate
flawlessly regardless of the operating
system.
Specifications
Number of Ports: 1
Max. Data Rate: 115.2K
Max. Data Distance: up to 4000 ft
Operating Temperature: 0 to 50°C
(32 to 122°F)
Storage Temperature: -20 to 70°C
(-4 to 158°F)
Power: from AC adaptor
Connector(s): DB25S (female) to 6
position screw terminal (TX± RX±,
ground and shield)
Dimensions: 9.65 cm L x 5.84 cm
W x 2.54 cm H (3.8 x 2.3 x 1.0")
Supports Data Rates
up to 115.2K bps
Isolated and Non-
Isolated Models
RS-422 Full Duplex
Support
RS-485 Full or Half
Duplex Master and Slave
Support
RS-485 Modes
Supported Include Auto
Baud, RTS, Data Enable,
and Always Enable
Selectable 120 Ohm Line
Termination and 1K Pull
Up/Pull Down Biasing
Onboard LEDS
Illuminate for Transmit
and Receive
Includes RTS Control
Driver Software to
Simplify RS485
Communications
in Windows
USA
MADE IN
Lifetime
OMG-CONV-485 RS-232 to
RS-422/485 Converter
To Order (Specify Model Number)
Model Number Price Description
OMG-CONV-485 $109 RS-232 to RS-422/485 converter
OMG-CONV-485-ISO 129 Isolated RS-232 to RS-422/485
converter
OMG-CONV-485-EC 129 RS-232 to RS-422/485 converter
with European AC adaptor
OMG-CONV-485-ISO-EC 149 Isolated RS-232 to RS-422/485
converter with European AC adaptor
OMG-CONV-485-UK 129 RS-232 to RS-422/485 converter
with UK AC adaptor
OMG-CONV-485-ISO-UK 149 Isolated RS-232 to RS-422/485
converter with UK AC adaptor
OMG-CA177 8 DB9F/25M 6 ft cable
OMG-CA104 8 DB25F/25M 6 ft cable
All OMG-CONV-485 converters include RTS control software and a complete user’s manual
on CD ROM and an AC adaptor. Ordering Example: OMG-CONV-485-ISO isolated
converter and OMG-CA177 cable, $129 + 8 = $137.
OMG-CONV-485
$
109
Basic Unit
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