EPSILON CLOCK MODEL EC20S Spectracom
105 User’s Manual
19.1.3 NMEA MESSAGE OUTPUT
Data and port parameters: ASCII, 9600 bps, 8 bits, 1 stop bit, no parity.
Protocol: <Message> <CR> <LF>
Format: $GPRMC,hhmmss.ss,S,llll.ll,a,yyyyy.yy,a,x.x,x.x,ddmmyy,x.x,a*hh
o RMC = Recommended Minimum Specific GNSS/TRANSIT Data
o hhmmss.ss = UTC of position fix
o S = status of the EPSILON CLOCK MODEL EC20S (A = OK, V=warning)
IF the datation source is not valid THEN S=’V’
ELSE (the datation source is valid) THEN
IF the EC20S is in ‘Forced Holdover’ mode (Ref. 65) THEN S=’A’
ELSE (the EC20S is NOT in ‘Forced Holdover’ mode)
IF the EC2OS Status (Ref. 3) is in ‘OK’ or ‘Warning’ state THEN S=’A’
ELSE (the EC2OS Status is in ‘Alarm’ state) S=’V’
o llll.ll = Latitude of fix
o a = N or S (North or South)
o yyyyy.yy = Longitude of fix
o a = E or W (East or West)
o x.x = not used, set to 0
o x.x = not used, set to 0
o ddmmyy = UTC date
o x.x = not used, Set to 0
o a = Set to E
o *hh = Checksum
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