Omega Products D3121 User Manual

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The D3000 and D4000 computer-to-analog output interfaces are designed to be mounted remotely from a host computer and communicate with standard RS-232 and RS-485 serial ports. Simple ASCII commands are used to control a 12-bit digital-to-analog converter that is scaled to provide commonly used current and voltage ranges. An on-board microprocessor provides the communications interface and many intelligent analog output functions. These modules offer an extremely flexible, easy-to-use, and cost-effective approach to data acquisition.

⻬ Analog Output Ranges: 0-1 V, ±1 V, 0-5 V,

±5 V, 0-10 V, ±10V, 0-20 mA, 4-20 mA

⻬ Programmable High/Low Output Limits ⻬ 500 V rms Output Isolation ⻬ Scaling in Engineering Units ⻬ 12-Bit Resolution ⻬ Baud Rates: 300 to 38,400 ⻬ Output Protection: 240 Vac (Current

Output), ± 30 V (Voltage Outputs)

OMEGABUS®Computer-to-Analog Output Modules

D3000 and D4000

The D3000 and D4000 are compatible with the OMEGABUS®D1000 and D2000 and may be used in any combination. Up to 124 modules may be strung on one set of wires. All modules are supplied with screw terminal plug connectors and captive mounting hardware. The connectors allow system expansion, reconfiguration, or repair without disturbing field wiring. Their small size allows them to be mounted in virtually any location or position including explosion-proof housings and DIN rails. Utility software (D1000-SW) is available upon request at no charge on an IBM-compatible disk.

The D4000 modules offer several additional features. A slew rate may be programmed, which causes the output to ramp at an

adjustable rate in either an increasing or decreasing direction. The ramp can be initiated and maintained by commands from

the computer or with external switch closures to the module. The D4000 module provides a readback feature which allows the computer

to verify the integrity of the output.

The D4000 modules also include a watchdog timer circuit that can be set such that if the

computer fails to communicate with the module

after a preset time period, the module will reset

itself to an adjustable default value. This feature

minimizes the risks of communication failure.

The A1000 RS-232 to RS-485 converter and repeater can be used if an RS-485 port is not available in your PC, and it is necessary to communicate long distances away. The A1000 also provides power for the modules. RS-232 modules can be used for distances less than 50 feet.

275

Basic Unit

SERIAL I/O

1.1"

(2.794 cm)

.85"

(2.159 cm)

2.45"

(6.223 cm)

A/OUT

(9.144 cm)

(5.842 cm)

1 2 3 4 5 6 7 8 9 10

(5.029 cm)

3.60"

2.3"

1.98"

1.612"

(4.094 cm)

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Common Specifications, D3000 and D4000

ANALOG OUTPUT

• Single channel analog output Voltage: 0-1 V, ± 1 V, 0-5 V, ± 5 V, 0-10 V, ± 10 V Current: 0-20 mA

• Input isolation to 500 V rms

• 12-bit measurement resolution

• Accuracy (integral and differential non-linearity):

0.1% FSR (max)

• Zero drift: ±30 µV/°C (voltage output) ±1.0µA/°C (current output)

• 1000 conversions per second

• Settling time to 0.1% FS 300 µs typical (1 ms max)

• Programmable output slew rate: 0.01 V/s (mA/s) to 10,000 V/s (mA/s) (D4000 only)

• Autozero and autocalibration-no adjustment pots

• Voltage compliance: ±12 V

• Output current, short circuit current: 5 mA min, 10 mA max

D3000 Series Output Module Current Output

Model No. Output Range Input Price

D3251 0 to 20 mA RS-232C $275 D3252 0 to 20 mA RS-485 275

D4000 Series Output Module Voltage Output

Model No. Output Range Input Price

D4121 ± 1 V RS-232C $350 D4122 ± 1 V RS-485 350 D4131 ± 5 V RS-232C 350 D4132 ± 5 V RS-485 350 D4141 ± 10 V RS-232C 350 D4142 ± 10 V RS-485 350 D4161 0 to 1 V RS-232C 350 D4162 0 to 1 V RS-485 350 D4171 0 to 5 V RS-232C 350 D4172 0 to 5 V RS-485 350 D4181 0 to 10 V RS-232C 350 D4182 0 to 10 V RS-485 350

D4000 Series Output Module Current Output

Model No. Output Range Input Price

D4251 0 to 20 mA RS-232C $350 D4252 0 to 20 mA RS-485 350

To Order

(Specify Model Number)

D3000 Series Output Module Voltage Output

Model No. Output Range Input Price

D3121 ± 1 V RS-232C $275 D3122 ± 1 V RS-485 275 D3131 ± 5 V RS-232C 275 D3132 ± 5 V RS-485 275 D3141 ± 10 V RS-232C 275 D3142 ± 10 V RS-485 275 D3161 0 to 1 V RS-232C 275 D3162 0 to 1 V RS-485 275 D3171 0 to 5 V RS-232C 275 D3172 0 to 5 V RS-485 275 D3181 0 to 10 V RS-232C 275 D3182 0 to 10 V RS-485 275

The D3000 and D4000 modules may be stacked for multiple outputs

ANALOG OUTPUT READBACK (D4000)

• 8-bit analog-to-digital converter

DIGITAL INPUTS

• Voltage levels: ±30 V without damage

• Three digital inputs (all models)

• Switching levels: High, 3.5 V min, low, 1.0 V max

• Internal pull-up resistors for direct switch input

COMMUNICATIONS

• RS-232, RS-485

• Up to 124 modules with A1000 converter/repeater, 32 without A1000

• User selectable channel address (via software command)

• Selectable baud rates: 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K

• ASCII format command/response protocol

• Parity: odd, even, none

• All communications setups (address, baud rate,parity) stored in nonvolatile memory using EEPROM

• Checksum can be added to any command or response

• Communications distance up to 10,000 feet with RS-485 modules

Power Requirements: Unregulated 10 V to 30 Vdc,

0.75 W max (voltage output), 1.0 W max (current output)

Case: ABS with captive mounting hardware Connectors: screw terminal barrier plug (supplied) Temperature Range: Operating: -25°C to 70°C

Storage: -25°C to 85°C Relative Humidity: 0 to 95% non-condensing