Advantech Data Acquisition Modules ADAM 4000 - Manual (Page 68)

Chapter
3
Chapter 3 I/O Modules 3-41
3.9 ADAM-4021 Analog Output Module
Analog output module receives its digital input through an RS-485
interface from the host computer. The format of the data is either two’s
complement hexadecimal format or percentage of full-scale range
(FSR), depending on the module’s configuration. It then uses its
microprocessor-controlled D/A converter to convert the digital data into
output signals.
You will get a true read-back of the analog output signal from the
unit’s ADC, which monitors the output independently. You can also
specify slew rates and start up currents through the configuration
software. The Analog Output Module can supply single-channel analog
output in a range of voltages or currents.
Furthermore, it will protect your equipment from power surges at
the ground terminal by providing opto-isolation of the D/A output and
up to 3000 V
DC
transformer based isolation.
Slew Rate
The slew rate is defined as the discrepancy between the present
number of milliamps (or Volts) per second and the required output
currents (or voltages). An ADAM analog output module may be
configured for a specific slew rate.