Friday, December 28, 2012

Using D6000 Series Modules with Labview

The DGH D6000 series seven channel analog and digital I/O modules are compatible with Labview data acquisition software. The modules utilize the Modbus RTU serial protocol for communications and easily interface with the Modbus device driver within Labview.
Sample Labview Block Diagram.

Labview uses Virtual Instruments to communicate with data acqusition hardware.  Sample Virtual Instruments are available for use with our D6000 series modules. Each virtual instrument is functional, contains a graphical user interface (GUI) and the block diagram designed to communicate with the modules. The front panel GUI is easily customizable and the block diagrams can be modified to build more complex applications. Click here to learn more.

Thursday, November 15, 2012

Connecting DGH Modules to Ethernet

The A3000 Serial to Ethernet converter connects an RS-232/422/485 serial port to a 10/100Base-T Ethernet network running TCP/IP. The serial to Ethernet converters provide an easy and economical way to monitor and control data from any location via the Internet.

The A3000 Serial to Ethernet converter easily connects DGH modules to the World Wide Web. It allows any host computer access to the serial port as a virtual COM port via an IP address. more details...

Monday, November 5, 2012

Continuous Digital Input/Output Application

The D1700 series modules may be setup in special modes which allow them to communicate without being polled by a host computer. Collectively these modes are called Continuous Input/Output Modes. In many applications the burden on the host may be greatly simplified and in some cases the host may be eliminated altogether. Three modes are available:
1.  Timer Mode: In this mode, a software timer is activated in the module with the Continuous Timer (CT) command. The CT command specifies a time period that repeats indefinitely. After each timeout, the module will output the status data. The module will periodically output the digital input data until the continuous mode is disabled.
2.  Edge-Trigger Mode: In this mode the D1711/1712 will output a data string when it receives a trigger signal on the B00/EV I/O Pin. The edge trigger mode will produce an output in response to an external event. It also provides a means of daisy-chaining several continuous output modules together.
3.  Change Mode: In this mode the D1711/1712 continuously monitors the status of the I/O lines. If a change is detected in status, an output data message is initiated.

Wednesday, October 3, 2012

Setpoint Controller Using D1000 Module

The DGH D1000 modules provide a means of creating a setpoint oven controller. All D1000 series analog input modules contain this feature. Our example will be using a D1300 series thermocouple temperature input module. Using the Setpoint (SP) command to load the desired temperature setpoint control value into the module and then configure the device alarm values for the deviation around the setpoint.
For example, send the following command $1SP+00100.00 to device address 1 to load a temperature setpoint value at +100 degrees. Then configure the HI and LO alarms with the hysteresis values referred to the deviation from the setpoint value. In our example, the hysteresis values are set to 5 degrees from the desired control temperature of 100. The high limit would be set to +00005.00 and the low limit would be set to -00005.00 to establish the hysteresis affect.  Click here to the setpoint controller application note.

Tuesday, September 11, 2012


DGH Corporation is an industry leader in sensor-based data acquisition. We offer a complete family of data acquisition hardware and software that provide analog and digital inputs and outputs for computer and networked applications.

Our data acquisition products can communicate via RS232 and RS485 using DGH ASCII or the Modbus RTU protocol. USB and Ethernet to serial converters are also available.