Software Description
ComTec GmbH
5-2
Parameters that can be set by editing the MPA4.INI file are the update rate in msec for the
refresh of the status, and it can be specified whether 2GB or 1GB RAM is built in. Set
DDR_2GB=0 for 1GB.
Expanded ADC ports:
set expandedports=1 if you have a device with more than 16 bits that you
want to connect to combined ADC ports.
External clock
: If you have a good external 10 MHz reference signal, for example a Rubidium or
GPS clock, you can use it the following way:
Change the MPA4.INI file and insert a line
extclk=1
After power up always the internal clock is used, so you should not yet connect the external clock
signal. Start the software. You will be prompted by a Messagebox to connect the external 10 MHz
signal to the BNC connector labeled "10 MHz" at the back side. If you later exit and restart the
software, let it connected. But after power down please disconnect it. When using the internal
clock the same connector outputs the internal 10 MHz signal.
The ADC port handshake signal polarities are defined also in this file. Several standard ADC’s
are already predefined and can be enabled simply by removing the semicolon at the beginning of
the respective line. Lines starting with such a semicolon are just used as comments.
The file MPA4A.SET contains the default settings. It is not necessary to edit this file since it is
saved automatically. Instead of this .SET file any other setup file can be used if its name without
the appendix ‘A.SET’ is used as command line parameter (e.g. MPA4
TEST
to load TESTA.SET).
Fig. 5.2: MPA4.ini File
