Advantech ADAM 4100, User Manual, Page: 139 / 155

Data Formats and I/O Ranges
D.1 Analog Input Formats
The ADAM analog input modules can be configured to transmit data to
the host in one of the following data formats:
-Engineering Units
-Percent of FSR
-Twos complement hexadecimal
-Ohms
D.1.1 Engineering Units
Data can be represented in engineering units by assigning bits 0 and 1 of
the data format/checksum/integration time parameter with value 00. This
format presents data in standard units such as degrees, volts, mill volts and
milliamps. When the value in engineering format is converted to computer
language, it is presented in seven characters. These characters may include
sign and decimals. However, the number of characters can not exceed
seven.
Data is grouped into a plus (+) or minus (-) sign, followed by five
decimal digits and a decimal point. The input range which is employed
determines the resolution or the number of decimal places used as
illustrated in the following examples:
Example 1
The input value is -2.65 and the corresponding analog input module is
configured for a range of ±5 V. The response to the Analog Data In
command is: -2.6500 (cr)
Example 2
The input value is 305.5
o
C, and the analog input module is configured
for a type J thermocouple whose range is (0
o
C to 760
o
C). The response
to the Analog Data In command is: +305.50 (cr)
Example 3
The input value is +5.653 V. The analog input module is configured for a
±5 V range. When the engineering unit format is used, the ADAM Series
analog input modules are configured so that they automatically provide
an over-range capability. The response to the Analog Data In command
in this case is: +5.6530 (cr)
D-2 ADAM 4100 Series User’s Manual