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PTP Translator Manual / December 2014 12
NMEA ZDA Time Code O/P
About This string is defined by the NMEA-0183 standard and transmitted at 9600 bps.
Timing
Transmission is once every second. The leading edge of the “start” bit of the “$” is exactly on the
second.
Default Comms 9600 bps, 8-bit ASCII, no parity
Definition $GPZDA,hhmmss.00,dd,mm,yyyy,s,xx,yy*CC<CR><LF>
Placeholder Content
$GPZDA ASCII “$GPZDA”
, ASCII “,” (comma)
hh UTC hour of day: “00” – ”23”
mm UTC minute of day: “00” – “60”
ss UTC Seconds: “00” – “59”
.00 ASCII ”.00”
dd UTC day of month: “01” – “31” depending on which month
mm UTC month: “01” – “12”, “01” = January
yyyy UTC year, 4 digits.
s Local time zone offset sign (positive means local time leads UTC)
xx Local time zone offset from UTC in hours
yy Local time zone offset from UTC in minutes
* ASCII “*”
CC
2-digit hex representation of the result of XORing the 8 data bits of each character between, but
not including the "$" and "*". (00-FF)
Example Interpretation:
$GPZDA,123456.0021200* UTC time is 12:34:56, 23 April 2010, the local time offset is +12:00
NMEA RMC Time Code O/P
About This string is defined by the NMEA-0183 standard and transmitted at 9600 bps.
Timing
Transmission is once every second. The leading edge of the “start” bit of the “$” is exactly on the
second.
Comms 9600 bps, 8-bit ASCII, no parity
Definition $GPRMC,hhmmss.00,a,tttt.tttt,N,ggggg.gggg,W,0.0,0.0,ddmmyy,0.0,E*CC<CR><LF >
Placeholder Content
$GPRMC ASCII “$GPRMC”
, ASCII “,” (comma)
hhmmss UTC hour, minute, seconds
. ASCII “.” (full stop)
0 ASCII “0”
a Status: “A” = valid, “V” = invalid
tttt.tttt Latitude : “00” – “89” degrees; “00.0000” – “59.9999” minutes
N Latitude (north/south): “N” = north, “S” = south
ggggg,gggg Longitude (degrees, minutes): “000” – “359” degrees; “00.0000” – “59.9999” minutes
W Longitude (east/west): “E” = east, “W” = west
ddmmyy UTC day of month, month & 2-digit year
E* ASCII “E*”
CC
2-digit hex representation of the result of XORing the 8 data bits of each character between, but not
including the "$" and "*".