DGH D3100M Modbus Voltage Output Module

The D3100M voltage output module is part of the DGH’s data acquisition module family. This output module converts digital MODBUS RTU signal from a host computer, received via RS-232 or RS-485 ports, to analog DC voltage output at the rate of 1000 conversions per second. Six output signal choices are supported (±1V, ±5V, ±10V, ±0-1V, ±0-5V and ±0-10V). The signals can then be used to control annunciators, acutators or other hardware. The D3100M module is a cost-effective model, ideal for simple step function control applications, but unlike non-MODBUS version D3100 it also features user-selectable output slew rate and a communications watchdog timer. These modules utilise a non-volatile EEPROM (Electrically Erasable Programmable Read Only Memory) to store all user-selectable settings, meaning the values are maintained in the event of power loss. The D3100M comes pre-set with default values of 300 baud, one start bit, eight data bits, one stop bit, no parity and any address recognised, but these values can be changed by the user. The modules are designed to be compatible with all popular computers utilising RS-232C or RS-485 ports and no software is necessary to start using them, although the utility software is provided. The D3100M can be mounted on a DIN-rail if required (MK-1 mounting kit required) and can be combined with other DGH modules to provide complete customised data acquisition system for given application.

• Computer-to-analog voltage output module
• Choice of RS-232 or RS-485 Input
• Choice of 6 different outputs: ±1V, ±5V, ±10V, 0-1V, 0-5V and 0-10V
• Communicates using MODBUS RTU protocol
• Programmable features include output slopes 0.01V/s to 65535V/s and a watchdog timer
• User-selectable features include analog input range, baud rate, parity type and others
• Accuracy: ±0.1% of full scale range maximum
• 12-bit output resolution
• Span temperature coefficient: ±50ppm/°C maximum
• 1000 conversions per second
• Settling time: 300µs typical (1ms maximum)
• Power requirements: Serial = 0.75W
• Temperature range -25°C to +70°C

The applications for the D3100M data acquisition modules include:

• Motion control
• Motor speed control
• Robotic welding control
• Interfaces to modems
• Programmable analog source for product test