The RS232 self test from COM1 to COM2 always fails in molbox1+ firmware version 6.01 and molbox1 firmware version 5.41. Prior versions work correctly and this will be corrected in the next firmware release for molbox1 and molbox1+ terminals.
See the molbox1 firmware update and log page here,
molbox1 v5.41 Embedded Software
See the molbox1+ firmware update and log page here,
molbox1+ or molbox1+S v6.01 Embedded Software
Contact Fluke Calibration Flow Technical Support at the below link or by calling +1.877.355.3225