CIGAL Reference Manual, Chapter 6 (RealTime): r_gtime
usage: r_gtime opflg eflag ltime DataAddr
R_GTIME is a REALTIME operator. It reads the current setting of the clock counter and stores it in the DATAADDR variable. The clock is read as a long (32 bit) unsigned integer in units of 20 microseconds. The time is relative to the beginning of the REALTIME command; this counter value is unaffected by operations such as R_RESET and R_REPEAT that can be used to establish local zero times for relative counting purposes.
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