I/O Modules
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ADAM 4000 Series User’s Manual
3.2 ADAM-4012 Analog Input Module
The ADAM-4012 Analog Input Modules use a microprocessor-
controlled integrating A/D converter to convert sensor voltage or
current signals into digital data. The digital data are then translated into
either two’s complement hexadecimal format or percentage of full-scale
range (FSR) according to the module’s configuration. When prompted
by the host computer, the data are sent through a standard RS-485
interface.
The ADAM-4012 Analog Input Modules offer signal conditioning,
A/D conversion, ranging, and RS-485 digital communication functions.
They protect your equipment from power surges at the ground terminal
by providing opto-isolation of the A/D input and up to 3000 VDC
transformer based isolation.
Digital Inputs/Outputs
The ADAM-4012 also contains two digital outputs and one digital
input. Outputs are open-collector transistor switches that may be
controlled by the host computer. They can control solid-state relays,
which can be applied to heaters, pumps, and other electrical powered
equipment. The digital inputs may be read by the host computer and
used to sense the state of a remote digital signal.
Event counting
The event counter is connected to the Digital Input channel and can
be used to keep track of the total amount of external low-speed pulses.
Its accumulated maximal count is 65535. The number 65535 is held
even if the actual number of events exceeds 65535. The counter can be
read or reset to zero by the host computer.
Since the Event counter’s data are not stored in EEPROM, the event
counter is cleared and set to zero after every reset or start up of the
analog input module.