Specifications

ManualsBrandsDGH ManualsTV Converter BoxA1000 series

D3000 and D4000 SERIES

COMPUTER TO ANALOG OUTPUT MODULES

D3000 and D4000 FEATURES

• Analog output ranges: 0-1V, ±1V, 0-5V, ±5V, 0-10V,

±10V, 0-20mA, 4-20mA.

• Communicates in ASCII with RS-232 or RS-485 serial

ports.

• Programmable high/low output limits.

• 500Vrms output isolation.

• 12-bit output resolution.

• Scaling in engineering units.

• Baud rates: 300 to 38,400.

• Nonvolatile digital calibration.

• Output protection: 240VAC (current output).

±30V (voltage outputs).

• Direct connection to ‘dumb’ terminals or modems.

• Requires +10 to +30Vdc unregulated supply.

• May be located up to 4,000 feet from host (RS-485).

• Addressable: up to 124 units per serial port.

• ‘Bumpless’ manual control inputs.

D4000 PROGRAMMING FEATURES

Provides intelligent features not found in the D3000.

• Fully programmable output slopes: 0.01V/s (mA/s)

to 10,000V/s (mA/s).

• Programmable data scaling to any desired units.

• True analog readback of output signal.

• Programmable starting value.

• Programmable watchdog timer provides orderly

shutdown in the event of host failure.

APPLICATIONS

• Motion control

• Motor speed control

• Robotic welding control

• Interfaces to modems

• Programmable analog source for product test

Summary of content (8 pages)

PAGE 1
D3000 and D4000 SERIES COMPUTER TO ANALOG OUTPUT MODULES D3000 and D4000 FEATURES • Analog output ranges: 0-1V, ±1V, 0-5V, ±5V, 0-10V, ±10V, 0-20mA, 4-20mA. • Communicates in ASCII with RS-232 or RS-485 serial ports. • Programmable high/low output limits. • 500Vrms output isolation. • 12-bit output resolution. • Scaling in engineering units. • Baud rates: 300 to 38,400. • Nonvolatile digital calibration. • Output protection: 240VAC (current output). ±30V (voltage outputs).
PAGE 2
D3000/4000 SPECIFICATIONS (typical @+25°C and nominal power supply unless otherwise noted.) Analog Output • Single channel analog output. Voltage: 0-1V, ±1V, 0-5V, ±5V, 0-10V, ±10V. Current: 0-20mA, 4-20mA. • Output isolation: 500V rms. • 12-bit output resolution. • Accuracy: 0.1% FSR max (Integral & Differential Nonlinearity. • Zero drift: ±30µV/°C (Voltage Output). ±1.0µA/°C (Current Output). • Span tempco: ±50ppm/°C max. • 1000 conversions per second. • Settling time to 0.1% FS: 300µs typ (1ms max).
PAGE 3
GENERAL DESCRIPTION & BLOCK DIAGRAM The DGH D3000/4000 series are complete computer-toanalog output interfaces. They are designed to be mounted remotely from a host computer and communicate, in ASCII, with standard RS-232 and RS-485 serial ports. Simple ASCII commands are used to control a 12bit DAC (Digital-to-Analog Converter) which is scaled to provide commonly used current and voltage ranges. An 8-bit CMOS microprocessor provides an intelligent interface between the host and the DAC.
PAGE 4
MANUAL MODE Manual Up/Down control option provides a local operator interface to control the analog output value independent of the host. As shown in Figure 2, the analog output may be moved up or down by shorting the UP* or DN* inputs to the GND terminal. Grounding both pins at once holds the output at its present value and inhibits any output commands from the communications ports. The control inputs may also be logic signals from other equipment. The manual mode controls the output with a linear slope.
PAGE 5
COMMAND SET The D3000/4000 series uses a simple command/ response protocol for communication. A module must be interrogated by the host to obtain data. A module can never initiate a command sequence. A typical command/response sequence could look like this: Command: $1RD Response: *+00075.00 A command is initiated with a command prompt, which may be a dollar sign ($) or a pound sign (#). Following the prompt a single address character must be transmitted.
PAGE 6
COMMUNICATIONS The D3000/4000 is designed to be easy to interface to all popular computers and terminals. All communications to and from the module are performed with printable ASCII characters. This allows the information to be processed with string functions common to most highlevel languages such as BASIC. For computers that support standard interfaces such as RS-232C, no special machine language software drivers are necessary for operation.
PAGE 7
by the host are examined by every module in the chain. If a module is correctly addressed and receives a valid command, it transmits a response on the daisy chain network. The response is rippled through any other modules in the chain until it reaches the host. RS-485 is a communications standard developed for multi-dropped systems that can communicate at high data rates over long distances, as shown in Figure 4.
PAGE 8
Using modems and D3000/4000 modules The modules can be used with auto-answer modems at remote sites for long-distance operation. A host computer may be used to call a modem and check the status of the process. The modules communicate using RS-232 which is the standard used by modems to communicate with devices such as printers or computers. The modem must be an auto-answer type.