Trimble Outdoors SK8 - Manual (Page 112)

A-48 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
A.17.42 Command Packet 0x60 -Type 1 Differential GPS Corrections
This packet provides the SVeeSix with differential corrections from RTCM SC-104
record types 1 and 9, in the TSIP format. There is no response to this packet. The units and
scale factors are as defined by RTCM-104 version 1. If byte 3 bit 7 is set, the unit and
scale factors are defined by RTCM SC-104 version 2. If bit 6 is set, the corrections are as
in RTCM Type 9 records. The format for this packet is shown in Table A-50:
The next 5 bytes are repeated as a group for each satellite. The SV PRN and scale factor
contains the SV PRN in the lower 5 bits, and the scale factor in the upper 3 bits. Range
corrections are scaled by 0.02 meters times 2 raised to the scale factor power. Range-rate
corrections are scaled by 0.002 meters per second times 2 raised to the scale factor power.
The format is shown in Table A-51.
Byte/Item Type/Units Value/Meaning
Byte 22/bad data flag BYTE Byte 22 value:
0 flag not set
1 bad parity
2 bad ephemeris health
Byte 23/Data collection
flag BYTE Byte 23 value:
0 flag not set
>0 The receiver currently is trying to
collect data from this satellite.
Table A-50. Report Packet 0x60 Data Formats
Byte Bit Item Type Units
0 - 1 All Modified z-count WORD .6 SEC
2 All Station health BYTE
3 7 not used BIT
6 Type 9 flag BIT 0 = type 1
1 = type 9
0 - 5 Number of SVs in packet BITS
Table A-51. Report Packet 0x60 Data Formats for Health and Power
Byte Item Type Units
4+ (N*5) SV PRN scale factor BYTE
5+ (N*5) Range correction WORD RTCM-104
7+ (N*5) Range-rate correction BYTE RTCM-104
8+ (N*5) IODE BYTE
Table A-49. Report Packet 0x5C Data Formats (Continued)