Two's Complement Format, 12-Bit - Automation Direct DL405 User Manual

Two's Complement The module's 32 Input Mode offers two's complement data formats in 12-bit and
Format, 12-Bit 13-bit ranges. The 12-bit range shown here is recommended only for compatibility
with existing D4–04AD applications. The 12-bit range may be used with both
unipolar and bipolar input signal ranges. The 12 data bits convert the analog signal
to 4096 "pieces" ranging from 0 to 4095 (2
0V signal would be –2048, represented as 63488, and a 5V signal would be 2047.
This is equivalent to a binary value of 1111 1000 0000 0000 to 0000 1111 1111 1111,
or F800 to 0FFF hexadecimal. However, two's complement representation is more
commonly used with bipolar input signal ranges.
+2.5V
Unipolar Ranges, Two's Complement 12-bit Format
0V to +5V
+5V
0V
63488 65535, 0 2047
Bipolar Ranges, Two's Complement 12-bit Format
–5V to +5V
+5V
0V
–5V
63488 65535, 0 2047
F4–04AD 4 Channel Analog Input
12
). For example, with a 0 to 5V scale, a
0V to +10V
+10V
+5V
0V
63488 65535, 0
2047
–10V to +10V
+10V
0V
–10V
63488 65535, 0
2047
3–21
4mA to 20 mA
20mA
12mA
4mA
63488 65535, 0
2047