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There are actually documented commands for controlling the Output modes:

OUTP:TRACK {0|1|2}

Source: the Manual

I also found these (OUTP:TRACK 2) when looking at captured wireshark traffic from the EASYcontrol Software.

In the logic to determine whether the supply is in Constant Voltage (CV) or Constant Current (CC) mode, the check of the bit appears to be reversed. For Channel 1, if Bit 0 is not set, the supply is in CV mode. If Bit 0 is set, the supply is in CC mode. The code seems to use an IF statement with a logical AND, but if the check is TRUE, it should return CC mode instead of CV mode. Usually the test will be FALSE (Bit 0 is not set) which would fall through to the ELSE statement and indicate the supply is in CV mode.