IceCORS network system expects information from the rover about its approximate position in NMEA-GGA format. For this purpose a bi-directional communication between rover and IceCORS network system must exist. IceCORS network software uses the Auto Switch. The nearest reference station is assigned by the Auto Switch once at the beginning of the connection. The chosen station is kept even if the rover moves closer to another station. If the rover wants to switch to another station, it has to disconnect and re-connect to RTCM_OUT (or use the NMEA $PGPPCMD user command feature). This limitation is necessary, because today's rovers do not expect a switch in reference station during a running connection. ========================================================== NMEA $PGPPCMD user commands ================================================================================================== The commands follow the NMEA syntax (with NMEA checksum hh) and have the folllowing format: $PGPPCMD,RTCM,cmd[=par]*hh Following commands cmd are accepted and will be evaluated by RTCM_OUT: cmd Description par ========================================================================================================================================================================================== SWITCHRS switch the nearest reference station, based on the the rover's last transmitted NMEA position (only if autoswitch option -AS is activated). [rtcmid] Optionally a parameter par can be specified, if the switch shall be made to a certain reference station. par is then the RTCM Id of the requested station. ========================================================================================================================================================================================== REQTYPE,ONCE requests the immediate transmission of certain information from the reference station: comma separated list POS: coordinates of station POS,ANT,SYS,MAC,EPH ANT: antennea on station SYS: system information (only with RTCM3) MAC: RTCM3 MAC network (only with RTCM3) EPH: ephemeris ========================================================================================================================================================================================== [rtcmid] ISAF [0101] HEID [0102] REYK [0103] HOFN [0104] AKUR [0105] MYVA [0106] FJOC [0107] INTA [0108] KALF [0109] RHOF [0110] GUSK [0111] RHOL [0112] ISAK [0113] VMEY [0114] SKHA [0115] HVEL [0116] SELF [0117] NYLA [0118] SKDA [0119] SIFJ [0120] HRAC [0121] FAGC [0122] SJUK [0123] VOGS [0124] STKA [0125] BLON [0126] ALHV [0127] LAVI [0128] FIHO [0129] BJTV [0130] GJFV [0131] VOFJ [0132] Updated 13.01.2022 by Dalia Prizginiene (dalia@lmi.is)