Jumpers and Coding Switches
4.1.5 Negation of Data Bit D11 (J300)
Via jumper field J300 the data bit D11 can be inverted for all D/A-converters simultaneously. This is
necessary, because depending on the mode of the output voltage, the D/A-converters expect the
data in various formats:
In
unipolar
operation the data has to be transmitted in
USB (Unipolar Straight Binary)
format.
In
bipolar
operation the converter expects the data in
BTC (Binary Two's Complement)
format.
NOTICE
Please note, the negation is especially important, because the analog outputs will only be
set to 0 V after a RESET, if bit D11 has got the level required for the operating mode!
J300
Example: D11 inverted for bipolar operation of D/A-converter outputs
Page 22 of 50
Manual • Doc. No.: V.1706.21 / Rev. 1.2
VME-DAC1612
jumper open
jumper closed
2
1
unipolar operation (D11 not inverted)
3
bipolar operation (D11 inverted)
