Document No. 422OP22395 - pg. 1/1
Not Recommended for New Installation
Please contact Technical Support for more information.
B&B Electronics 1993 - June 1995
This product designed and manufactured in USA of domestic and imported parts by
Two-Channel RS-422 Port-Powered Isolator
Model 422OP2
The Model 422OP2 is a self-powered device that optically isolates two RS-422
data lines. The 422OP2 provides 2000 volts of isolation at any data rate up to 38.4K
baud. The isolator is provided with a DB-25 male connector on one side and a DB-25
female connector on the other side. Signals pass through the 422OP2 as follows:
The 422OP2 derives the power needed to transmit on each side from that side's differential voltage on the receive
pair. For the 422OP2 to operate properly, there must be at least 3.5 Volts between the input A and B lines on each side of
the isolator. Because the power for the 422OP2 comes directly from the transmitting port, no signal ground connection is
required to maintain proper common mode voltage.
NOTE: When using an external supply, the supply should be connected only to specifically labeled power inputs
(power jack, terminal block, etc.). Connecting an external power supply to the handshake lines may damage the
unit. Contact technical support for more information on connecting an external power supply to the handshake
lines.
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