RS-422/485 to RS-232 Interface Converter

RS-422/485 to RS-232 Interface
Converter
IBM PS/2
IBM PC
SERIAL I/O
CAT-285
189
$
⻬ User Selectable
RS-422 or RS-485
⻬ RS-485 User Selectable
2 or 4-Wire Operation
⻬ Intelligent Control
of RS-485 Transmitter
and Receiver
⻬ Td and Rd LED
Indicators
⻬ DTE/DCE Compatible
⻬ Data Rates
up to 64k BPS
The CAT-285 is a unique interface
converter that can be configured by
the user to convert either RS-422 or
RS-485 to RS-232. When operating
in RS-485 mode, the CAT-285 has
an “intelligent” mode which provides
control of the RS-485 line.
When configured to operate as
an RS-232 to RS-422 interface
converter, the CAT-285 converts
full duplex data, Td and Rd,
between RS-232 and RS-422.
As an RS-232 to RS-485 converter,
the unit can be configured for either
2 or 4-wire operation. In either
mode, the CAT-285 allows control
of the transmitter so that multidropped operation can be
accommodated. The CAT-285 can
be configured to control its data flow
in one of two ways. The first is via
the use of RTS, pin 4, of the RS-232
port. In this case, the RS-485
transmitter will turn ON when RTS
is turned on. When RTS is OFF,
the CAT-285 is in the receive mode.
In the 4-wire mode, the receiver is
always on. The second method of
controlling the RS-485 transmitter
is to turn it on when Td data is
applied to the RS-232 port.
CAT-285, $189, shown smaller than actual size
The receiver also operates
differently depending on whether
the mode is 2 or 4-wire. In the
2-wire mode, when no data is
received by the RS-232 receiver,
the RS-485 receiver is switched ON.
When data is detected for
transmission, the receiver is
switched OFF. In the 4-wire mode,
the RS-485 receiver is constantly
ON while the transmitter is switched
as required.
The CAT-285 is equipped with
a five position dip switch that is
used to select the following:
RS-422 mode: 4-wire
RS-485 mode: 2-wire
RS-485 mode: 4-wire
RS-485 mode: controlled by RTS
RS-485 mode: controlled by data
220 ohm terminator: in or out
The CAT-285 is also equipped
with a DTE/DCE switch to allow
reversing pins 2 and 3 on the
RS-232 interface. Td and Rd LED
indicators help verify operation.
Specifications
Interface: RS-232, conforms
to CCITT V.24; pins 2 and 3
(transmit/receive data) switch
selectable, pin 4 (RTS) tied to pin
5 (CTS), pins 6 (DSR), 8 (DCD)
and pin 20 (DTR) are connected
together; RS-422 or RS-485,
selectable
Connectors: RS-232, DB-25 male,
RS-422/485, 5-position terminal
block
Indicators: 2 LEDs, Td and Rd
Switches: DTE/DCE switch
selectable for reversing
Td and Rd; 5-position dip switch
set RS-422/485 operation and
termination
Data Rate: 0 to 64k bps
MTBF: 596,000 hours
Power: 115 Vac at 60 Hz
Dimensions:
0.875"H x 2"W x 3.5"D
Operating Ambient: 0 to 50°C
(32 to 122°F); 5 to 95% RH,
non-condensing
AVAILABLE FOR FAST DELIVERY!
To Order (Specify Model Number)
Model No.
Price
Description
CAT-285
$189
RS-422/485 to RS-232 interface converter
Ordering Example: CAT-285, RS-422/485 to RS-232 converter, $189.
J-3
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