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J-5
$
261
Basic Unit
⻬ 1500 VRMS Isolation with
Optical Couplers and
Power DC-to-DC Converter
(6,000 VDC, 1 min)
⻬ Industrial Surge
Protection Devices
and 15 KV ESD Protected
RS-232 Inherent
⻬ Four LED
Diagnostic Indicators
⻬ 115.2 K BPS (BAUD)
at 0.8 mile (1.3 km),
38.4 K BPS (BAUD)
at 1 mile (1.6 km)
⻬ RTS, DTR, or Auto
RS-485 Transmitter
Control
⻬ Tri-State Outputs for
Multidrop Applications,
up to 32 Devices
⻬ Selection of Connectors
⻬ Pluggable Solderless
Screw Terminal Field
Connections
⻬ Easily Mounts on
Standard DIN Rail
⻬ 2-Wire or 4-Wire R5-485
The DCP485 is a compact RS-232to-RS-485 converter which features
a complete electrical isolation
barrier and heavy duty electrical
surge protectors. These devices
feature a DIN rail mountable
enclosure, for application to a
junction box, a panel, a relay rack,
the side of your computer, or
anywhere a DIN rail can be
mounted. Isolation is provided by
optical couplers and a transformerisolated DC-to-DC converter. The
RS-232 connection is made through
male or female EIA 9-pin D sub
connectors, or a 3-wire RS-232
connection can be made through
convenient pluggable screw
terminals. The RS-485 connections
are made through convenient
pluggable solderless screw terminals.
The DCP485 series is designed for
full duplex operation over two-wire
pairs. Outputs are tri-state, allowing
multidropping of up to 32 units. Data
rates are up to 115.2 K bits per
second (baud). Four diagnostic LED
indicators are provided for
installation guidance and system
troubleshooting. The RS-232
interface includes Request To Send
(RTS) and Data Terminal Ready
(DTR), either of which can be used
via a DIP switch to enable the
RS-485 transmitter.
Alternately, the DCP-485 offers
automatic line switching: the RS-485
transmitter is enabled automatically
by each character sent on the
RS-232 Transmit Data (TD) line.
Additionally, the RS-485 transmitter
and receiver can be independently
enabled continuously or under
RS-232 control. A convenient null
modem switch is provided for the
data lines. Also, line termination
switches independently connect line
termination and line bias resistors to
the RS-485 lines. The units are
powered from wide-range voltages
of 10 to 30 Vdc through pluggable
solderless screw terminals.
Component Functions and
Descriptions:
Front of Unit–
DB-9 Connector
RS-232 standard 9-position D sub
pinout with pin 9 not connected
LED’s
TD - shows state of RS-232
Transmit Data line - “on” when
TD is a SPACE.
RD - shows state of RS-232
Receive Data line - “on” when
RD is a SPACE.
CTRL - shows state of RS-232
control line (RTS/DTR) or data
enabled auto mode
RS-485 transmitter control line LED is on when control line is
asserted.
PWR - is on when DCP-485 is
supplied with +10 to +30 Vdc power.
RS-232 Side –
Terminal Block
Includes DCP-485 power input and
optional RS-232 TD, RD and ground
connections.
DIP Switches
COMM MODE DCE/DTE - reverses
pins 2 & 3 of the DB-9 connector
and screw terminals 3 & 4 of the
RS-232/Power terminal block.
CTRL MODE AUTO/RTS/DTR select AUTO mode or RTS/DTR to
enable the RS-485 transmitter.
LINE RTS/DTR - select RTS or DTR
to enable the RS-485 transmitter.
RS-485 Side –
Terminal Block
Includes four RS-485 terminals
and one isolated return terminal
DCP-485
Fully Isolated RS-232/RS-485 Converter
Extended Warranty
Program
SM
Page 2
To Order
(Specify Model Number)
Model Number Price Description
DCP-485-P $261 Isolated RS-232/RS-485 converter
with male RS-232 9-pin connector
DCP-485-S 261 Isolated RS-232/RS-485 converter with
female 9-pin connector
J-6
DIP Switches
TD Term - switches a 120 Ω
termination resistor across the RS-485
transmit data lines TD A & TD B.
RD Pull Up/Term/Pull Dn - RD Term
switches a 120 Ω termination
resistor across the RS-485 receive
data lines. RD Pull Up & RD Pull Dn
switch a pull up resistor to RD B’
and a pull down resistor to RD A’,
respectively.
TD Cont En/Ctrl’d - select
continuous enable or RS-232 side
signal control of the RS-485
transmitter. RD Cont En/Ctrl’d select continuous enable or RS-232
side signal control of the
RS-485 receiver.
Specifications
Baud Rates (bps): 115.2 K, 57.6 K,
38.4 K, 19.2 K, 9.6 K, 4.8 K, 0-2.4 K
Distance (miles): 0.8, 0.9, 1.0, 2.6,
3.5, 4.0, 7.0
Distance (km): 1.3, 1.5, 1.6, 4.2,
5.6, 6.4, 11.3
Wire Capacitance: equal to 25 pF
per foot and up to 32 multidrop units
Max Multidrop Units: 32
COMMON MODE ISOLATION
Surge: 6000 Vdc, 1 min.
Continuous: 1500 Vrms
Differential Mode Surge
Protection: (dc input and RS–232
inputs and outputs, RS–485 inputs
and outputs)
Modes: Asynchronous 4–wire
duplex, 2–wire half duplex, 2–wire
simplex
Channel Lines: (1) TD, RD
Control Lines: (1) RTS, DTR
Null Modem Switch:
1 (Reverses RS-232 pins 2 and 3)
RS-485 Output Drive: 28 mA
max/output
RS-485 Input Impedance:
12 kΩ min/input
Power: 10 to 30 Vdc @ 150 mA max
TEMPERATURE
Operating Range: 0 to 60°C
(32 to 140°F)
Storage Range: 0 to 70°C
(32 to 158°F)
Relative Humidity: 0 to 95%
non-condensing
Altitude: To 4574 m (15000')
Dimensions:
109 mmH x 84mmW x 22.5 mmD
(4.3 x 3.3 x 0.89")
Weight: 130 g (4.6 oz)
MTBF: (2) >100,000 hrs
J
Includes complete operator’s manual.
Ordering Example: DCP-485-S and OMEGACARESM1-year extended warranty
for DCP-485-S adds 1 year to standard 1-year warranty), $261 + 26 = $287.
DCP-485 Block Diagram
Dimensions for DCP-485
Notes:
(1) TD = Transmit Data, RD = Receive Data, RTS = Request to send, DTR = Data Terminal Ready.
(2) Ground-benign environmental conditions (no salt atmosphere, <50°C ambient temperature).
Page 3
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