Trimble Outdoors SK8 - Manual (Page 120)

A-56 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
A.17.53 Report Packet 0x7B
Report Packet 0x 7B has one form. See Command Packet 0x 7A for more information about
the data formats.
To set the NMEA interval and message mask, use the values shown in Table A-62.
A.17.54 Report Packet 0x82
This packet provides the differential position fix mode of the receiver. This packet
contains only one data byte to specify the mode. The packet is sent in response to Packet
0x 62 and whenever a satellite selection is made and the mode is Auto GPS/GPD (modes 2
and 3). The receiver switches automatically between modes 2 and 3 based on the
availability of differential corrections for a constellation which meets all other masks. If
such a constellation is not available, then the receiver stays in its current automatic mode
(2 or 3), and does not do position solutions.
Valid modes are:
Mode 0 Manual GPS (Differential off) — The receiver does position solutions
without differential corrections, even if the differential corrections are
available.
Mode 1 Manual GPD (Differential on) — The receiver only does position solutions if
valid differential correction data are available.
Mode 2 Auto GPS (Differential currently off) — The receiver is not receiving
differential correction data for all satellites in constellation which meets all
other masks, and is doing non-differential position solutions.
Mode 3 Auto GPD (Differential currently on) — The receiver is receiving differential
correction data for all satellites in a constellation which meets all other masks,
and is doing differential position solutions.
Table A-62. Report Packet 0x7B Message Mask Settings
Byte Item Type Value Meaning
0 Subcode BYTE 0
1 Interval BYTE The time in seconds between NMEA
messages
2-5 Output
mask UNSIGNED
LONG INT The NMEA bit-mask for outputting
messages