Prevents proprietary source code from being provided as customer documentation
versions:
[Version: 2] $PGLOR,2,SIO - Serial I/O status report
[Version: 1] $PGLOR,1,SIO - Serial I/O status report
[Version: 0] $PGLOR,0,SIO - Serial I/O status report
[Version: before GLL v18] $PGLOR,SIO - Serial I/O status report