YSI 600LS - User Manual - Manual (Page 360)

NMEA Applications Appendix N
YSI Incorporated Environmental Monitoring Systems Operations Manual N- 1
APPENDIX N NMEA APPLICATIONS
6-series sondes can be configured to output NMEA formatted strings (National Marine Electronics
Association). Some equipment manufactures in the marine industry use this as their native method of
communication. This appendix is designed to help personnel who are already trained in NMEA
applications implement this specialized protocol for their sondes.
NMEA APPLICATIONS SET UP
There are two ways to get NMEA strings from the sonde:
1. Send the NMEA command from the command prompt.
2. Enable start up to NMEA in the advanced setup menu.
Once the sonde is outputting NMEA strings you can return to the command prompt by sending an <ESC>
character. Note that if you enabled start up to NMEA, the sonde will revert back to outputting NMEA
strings after you reset or power cycle the sonde.
The format of the NEMA string is:
$YSI,Code #1,Value #1,Code #2,Value #2,...*XX
Code is the YSI defined parameter code. (See table below)
Value is the value of the parameter.
XX is a check computed by a bitwise “exclusive or” (xor) of all characters between $ and *, non inclusive.
The XX value is sent as 2 hexadecimal nibbles, most significant nibble first.
Here’s an example:
$YSI,1,4.44,7,10,18,7.00*4E
In this case we have:
Temp C 4.44
SpCond uS/cm 10
pH 7.00
PARAMETER CODES
The list below shows all possible parameters that can be output from a 6-series sonde. Note that depending
on the sonde type you have, some parameters may not be available. In addition, some parameters are for
internal testing only and will not be available, but are listed for completeness.
Code Name and units
---- --------------
51, Date d/m/y
52, Date m/d/y
53, Date y/m/d
153, Date
54, Time hh:mm:ss
1, Temp C
2, Temp F
3, Temp K
6, SpCond mS/cm