Omega Products DRA-DCC-8 User Manual
DRA-DCC-8 Digital to 8 Current Loop
Converter
H-63
To Order
(Specify Model Number)
Model No. Price Description
DRA-DCC-8 $820 Digital to 8 current loop converter
DRN-PS-1000 150 Power supply, 95-240 Vac input, 24 Vdc
@ 1A output
U Parallel/Serial
Communications Ports
U ±0.1% Accuracy
U 12 Bit Resolution
U Solid-State Technology
Comes with complete operators manual.
Ordering Example: DRA-DCC-8 digital to 8 current loop converter with DRN-PS-1000
power supply, $820 + 150 = $970
$
820
The DRA-DCC-8 is a
microprocessor-based unit which
converts digital data into eight
continuous analog current loops.
The processor controls the digital
input, handles the active memory of
the unit and updates the current
outputs. For digital input range of
000 HEX to FFF HEX, the unit
provides two user selected output
current spans of either 4 to 20 mA
or 0 to 20 mA.
One parallel and two serial ports are
available. The parallel input port
receives an asynchronous 15 bit
bus composed of a 3 bit output
channel address and 12 bits of data
representing the output current
value. DRA-DCC-8 units can be
connected in parallel to the input
bus and selected by controlling the
Enable (E) input terminal. The unit’s
controller continuously scans the
input data field and compares it to
the previously stored data. When
new data is encountered, the old
data is replaced and the proper
output current is updated.
The DRA-DCC-8 provides both
RS-232C and RS-422 full duplex
serial communications ports. The
RS-422 serial communications port
enables use of up to eight
DRA-DCC-8 units in a multi-drop
configuration. A set of seven
Specifications
GENERAL
Accuracy: ±0.1% of span typical;
±0.2% of span max
Resolution: ±0.025% of span
typical; ±0.05% of span max
Indicators: 8 red LEDs for current
outputs, one yellow power on LED
Supply Voltage: 15 to 32 Vdc
regulated
Operating Current Consumption:
85 mA max (not including output
currents)
Maximum Loop Resistance: Rmax
(Ohms) = (Vsupply - 6)/.02
Operating Ambient: 0 to 55°C
(32 to 131°F), 5 to 95% RH
noncondensing
Storage Temperature: -25 to 85°C
(-13 to 185°F)
Enclosure: polycarbonate
Mounting: standard 35 mm DIN rail
or wall mount
Weight: 0.7 kg (1.5 lb)
Dimensions: 73 H x 200 W x 121
mm D (2.88" x 7.88" x 4.76")
internal DIP switches enables
parameters such as baud rate, unit
identity code, digital input mode
(parallel or serial) and output current
span (4-20 mA or 0-20 mA) to be
set by the user.
PARALLEL INPUT
Parallel Input: 3 - Output current
loop address (ADDRESS);
12- Output current value (DATA);
1 - Enable (E)
Logic Levels: 0 < “0” < 0.5V; 4 <
“1” < 60V
Input Data Holding Time: 150
microseconds
Maximum Parallel Input Rate:
6000 updates per second
SERIAL INPUT
Serial Communications:
RS-232C/RS-422 full duplex
Baud Rates: 2400, 4800, 9600,
19200 baud
Parity: even
Stop Bits: one
Echo Back: after each channel
block transfer
Status Report: unit reports status
on request
Multi-Drop Capability: up to 8 units
on RS-422
OUTPUTS
Outputs: 8 continuous current
loops
Output Current Span: 0 to 20 mA
or 4 to 20 mA user selected
Output Current Settling Time:
4.2 millisecond max for 99.3%
of step
OMEGA
CARE
Extended Warranty
Program
SM
DI/O
SERIAL I/O
A/OUT
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