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부품번호 DCP485 기능
기능 Fully Isolated DIN Rail RS-232 to RS-485 Converter/Line Driver
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DCP485 데이터시트, 핀배열, 회로
Industrial Data Communication Products Data Comm.
DCP485
Fully Isolated DIN Rail RS-232 to RS-485 Converter/Line Driver
Description
The DCP485 is a compact RS-232 to 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 sides of computer equipment, or
anywhere a DIN rail can be mounted. Isolation is provided by optical couplers
and a transformer isolated DC-to-DC converter. The RS-232 connection is
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 over one pair.
Data rates are DC to 115.2k 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 DIP switches to enable the
RS-485 transmitter. Alternately, the DCP485 offers automatic line switching in
which 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 may 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 +30VDC through pluggable solderless screw terminals.
Features
• Complete Isolation with Optical Couplers and
Transformer-Coupled DC-to-DC Converter
• Industrial Surge Protection Devices and 15kV
ESD Protected RS-232 Inherent
• Four LED Diagnostic Indicators
• 38.4k bps (baud) at 1 Mile (1.6km),
115.2k bps (baud) at 0.8 Mile (1.3km)
• RTS, DTR, or Auto RS-485 Transmitter
Control
• Tri-state Outputs for Multidrop Applications,
up to 32 Devices
• Selection of Connectors
• Wide Operating Temperature Range
• Pluggable Solderless Screw Terminal Field
Connections
• CE Compliant
Dataforth does not authorize or warrant its products for use in life support/
critical applications.
Specifications
Model
Baud Rate Range
Baud Rate
Distance(miles)
Distance(km)
Wire Capacitance
Max Multidrop Units
Common Mode Isolation
Differential Mode Surge
Protection (9 devices)
Modes
Channel Lines(1)
Control Lines(1)
Null Modem Switch
RS-485 Output Drive
RS-485 Input Impedance
Power
DCP485
0-115.2k bps (Baud)
115.2k 57.6k 38.4k 19.2k 9.6k 4.8k 2.4k-0
0.8 0.9 1.0 2.0 3.0 4.0 7.0
1.3 1.5 1.6 3.2 4.8 6.4 11.3
Equal to 25pf per foot and up to 32 multidrop units
32
Surge: 6000VDC, 1 min.
Continuous: 1500Vrms
(DC input and RS-232 inputs and outputs)
ANSI/IEEE C37.90.1
(all RS-485 inputs and outputs)
Asynchronous 4-wire full-duplex, 2-wire
half-duplex, 2-wire simplex
TD, RD
RTS, DTR
1 (Reverses RS-232 pins 2 and 3)
28mA max/output
12kmin/input
+10 to +30 VDC at 150mA max
Model
DCP485
Environmental:
Operating Temperature Range
Storage Temperature Range
Relative Humidity
Altitude
-40°C to +60°C
-40°C to +70°C
0-95% non-condensing
to 15000 ft (4574 m)
Dimensions
4.3” x 3.3” x 0.89”
(109mm x 84mm x 22.5mm)
Weight
4.6 oz (130g)
MTTF(2)
>100,000 hrs
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).
Visit our website www.dataforth.com
SD1083 Rev C




DCP485 pdf, 반도체, 판매, 대치품
Industrial Data Communication Products Data Comm.
RS-232 Side
Factory Default Switch Settings
Switch
Setting
CTRL LINE
DTR
RTS
CTRL MODE
RTS/DTR
AUTO
COMM MODE
ON
OFF
ON
OFF
DCE
RS-485 Side
Factory Default Switch Settings
Switch
Setting
TD Term
RD Pull Up
Term
Pull Dn
TD Cont En
Ctrl’d
RD Ctrl’d
Cont En
OFF
ON*
ON*
ON*
OFF
ON
OFF
ON
Selected Applications - Switch Settings
Selected Applications - Switch Settings
COMM MODE set complementary to connected port - DCE, DTE or DTE, DCE.
Loopback Self Test 4-wire Point-to-Point 2-wire Multidrop
Loopback Self Test 4-wire Point-to-Point 2-wire Multidrop
CTRL LINE
DTR
RTS
CTRL MODE
RTS/DTR
AUTO
CTRL LED
ON
OFF
ON
OFF
ON
control line state
See Text Below
See Text Below
ON
OFF
ON
switch setting and
See Text Below
See Text Below
See Text Below
See Text Below
Depends on DIP
DIP switch settings for 2-wire multidrop configurations depend on your
equipment’s hardware and software capabilities.
If your equipment’s hardware and software can support RTS or DTR data
control, set CTRL MODE RTS/DTR to ON and AUTO to OFF. Then for RTS
control, set CTRL LINE DTR to OFF and RTS to ON. For DTR control, set CTRL
LINE DTR to ON and RTS to OFF.
RD Cont En
Ctrl’d
TD Ctrl’d
Cont En
RD Pull Dn
ON*
OFF
OFF
ON*
OFF
Term OFF
Pull Up OFF
TD Term OFF
ON*
OFF
OFF
ON*
ON*
ON*
ON*
ON*
OFF
ON*
ON*
OFF
Ends
Middles
Ends
Middles
Ends
Middles
Ends
Middles
ON*
OFF
ON*
OFF
ON*
OFF
OFF
OFF
DIP switch settings for 2-wire multidrop configurations depends partly on
preferences and partly on network configuration and environment.
RD Cont En and Ctrl’d settings depend on whether your system requires local
data be echoed or not. For echoed data, set the switches opposite to table
settings.
If your equipment’s hardware and software cannot support RTS or DTR data
control or if you prefer AUTO mode, set CTRL MODE RTS/DTR to OFF and
AUTO to ON.
Remember, AUTO mode timeout is set so that AUTO mode will work from 4800
bits per second (bps/Baud) to 115.2k bps. The DCP485 automatically enables
the RS-485 transmitter for 2.5ms (4800 bps 12 bit character time) for each
character sent. This means there will be an up to 2.4ms delay at the end of each
message before another transmitter can transmit. This timeout can be custom
set at the factory for higher or lower minimum data rates by request.
*Termination DIP switches settings are given according to good transmission
line practice. In general, any transmission line longer than 100 feet (30.5 m)
should be terminated at the extreme ends. Any line drivers in the middle
between the extreme ends should not be terminated. However, you may find for
your line configuration and environment, you may need to terminate under 100
feet (30.5 m) or you can terminate one end but not the other or you may or may
not need RD Pull Up or Pull Dn. Also if mixing RS-485 and RS-422 devices or
for any other reason, you may not want to use the built-in 120termination but
substitute an external higher resistance, such as, 240. Set the terminations for
the most reliable data transfer.
RS-485 Side
Selected Applications - Connections
RS-485 Side
Selected Applications - Connections
Loopback Self Test
Function
Terminal
Terminal
TD A
TD B
5 .................................... 3
4 .................................... 2
Other Manufacturers’ Nomenclature:
Dataforth
Other Manufacturers
A, A’ =
B, B’ =
-, DATA -, or DATA* (Inverse Data)
+,DATA +, or DATA (True Data)
Function
A’ RD
B’ RD
4-wire Point-to-Point
Function
Terminal
Terminal
TD
TD
RD
RD
Return,
Isolated
A
B
A’
B’
RTN
5
4
3
2
1
3
2
5
4
1
NOTES: (1) Return, Isolated not required. Use for shield if desired.
Function
A’ RD
B’ RD
A TD
B TD
RTN Return,
Isolated
For information call 800-444-7644

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Fully Isolated DIN Rail RS-232 to RS-485 Converter/Line Driver

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