DM210 RTD Embedded Technologies dataModule Analog Input Module

The RTD Embedded Technologies DM210 / DM5210 dataModule Medium Speed Analog Input Modules turn your IBM PC-compatible cpuModule or other PC/104 computer into a high-performance data acquisition and control system. It is ultra-compact for embedded and portable applications.

The difference between the DM210 and DM5210 is the power supply requirements: the DM210 requires ±12 and +5 volt power sources and the DM5210 requires a +5 volt source. The following paragraphs briefly describe the major functions of the module.

Analog-to-Digital Conversion

The analog-to-digital (A/D) circuitry receives up to 16 single-ended analog inputs and converts these inputs into 12-bit digital data words which can then be read and/or transferred to PC memory. The analog input voltage range is jumper-selectable for bipolar ranges of -5 to +5 volts or -10 to +10 volts, or a unipolar range of 0 to +10 volts. The module is factory set for -5 to +5 volts. Overvoltage protection to ±35 volts is provided at the inputs. The A/D conversions are performed by a 12-bit successive approximation converter. This high performance converter and the high-speed sample-and-hold amplifier preceding it, make sure that dynamic input voltages are accurately digitized. The resolution of a 12-bit conversion is 2.4414 millivolts and the maximum throughput is 40,000 samples per second. The converted data is read and/or transferred to PC memory, one byte at a time, through the PC data bus.

8254 Timer/Counter

The 8254 programmable interval timer contains three 16-bit, 8-MHz timer/counters to support a wide range of timing and counting functions. The clock, gate, and output pins for each of the three timer/counters are available at the I/O connector.

Digital I/O

The DM210 / DM5210 has 20 TTL/CMOS-compatible digital I/O lines which can be directly interfaced with external devices or signals to sense switch closures, trigger digital events, or activate solid-state relays. The lines are provided by the on-board 8255 programmable peripheral interface (PPI) chip. Sixteen of the lines are brought out to the I/O connector and four are available at a set of on-board pads located near the edge of the module for easy access. The pads for installing and activating pull-up or pull-down resistors are included on the module for the 16 lines brought out to the I/O connector.