Black Box IC476A-F-R2 - Manual (Page 21)

20
ASYNC 232
↔422/485 CONVERTER
4.4 Operation
Once the Converter is properly installed, it should operate transparently—
as if it were a standard cable connection. Operating power is derived from
the RS-232 data and control signals; there is no ON/OFF switch. All
data
signals from the RS-232 and RS-485 interfaces are passed straight through.
Additionally, in DCE mode, a Transmitter ON signal received at the
RS-422/485 RCV connection will cause DCD output at the RS-232
connector to assert HIGH. In DTE mode, a Transmitter ON signal at the
RS-422/485 RCV connection causes RTS output at the RS-232 connector to
go HIGH. Therefore, one hardware signal in either DTE or DCE mode is
virtually “passed through” the Converter in the direction of RS-422/485 IN
to RS-232 OUT.