Only CC or CR mode can be used in Group Unit.
For the single channel load modules, PEL-2040A and
PEL-2041A are fully support these two modes (Para,
Sync) of group function.
The PEL-2030A does not support group function.
The dual channel of PEL-2020A does support group
function partially. It can support to group 2 units of
same module under the Sync mode only. That means
the PEL-2020A can be 2chx100W or 1chx200W.
Ensure the same firmware used for both units.