A laptop installed with TreeTech 3.1 is configured for a serial connection to a GCM-86000. After starting communication in TreeTech, there are no startup errors but the serial communication link fails.
TAC I/A Series
Using TreeTech to do GCM backups with the demise of ProBlock
On page 25 of the TreeTech Engineering Guide (F-26640), the recommended setting for ODSR (output date set ready) is ON for a GCM-86000.
At times, the age and model of laptop may require that ODSR be set to OFF. Try it.