Differential Commands 295
Differential Commands
AGE: In base station mode, this field indicates the elapsed time in
seconds between the transmission of Type 1 or 9 messages. In
remote station mode, this field indicates the age of the received
messages in seconds.
1 to 999
QA: The communication quality factor between base and remote.
Defined as (number of good messages received/total number of
messages) x 100 total number of messages. This field applies to
remote differential mode only.
000.0% to 100.0%
OFFSET The number of bits from the beginning of the RTCM byte (in case of
a bit slippage).
SETUP This subsection of the RTC response message contains status
information related to RTCM parameter settings, such as the
operating mode, the RTCM messages enabled for output, the port
assigned to receive or transmit differential corrections, etc. MODE,
PORT, AUT, SPD, STI, STH, MAX, QAF, SEQ, TYP, FRQ, BASE,
and MSG fall into this subsection.
MODE The current differential mode. The default setting is OFF. BAS, REM, OFF
PORT The port used for receiving or transmitting RTCM corrections. A, B, or C (optional)
SOURCE The source of the RTCM corrections. SLC with any
combination of EXT,
BCN, or SBA
-OR-
WGH
AUT Indicates whether automatic differential mode is enabled (Y) or
disabled (N). The default setting is N. This field applies to remote
station mode only.
Y, N
FMT The data format for the corrections. RTCM, RTCA
SPD Indicates the current rate of output for RTCM corrections in bits per
second (bps). The default output rate is 300 bps. This field applies
to base station mode only.
25 to 1500
STI The differential station ID number. The ID number is a user-entered
parameter. A remote station with an ID number of 0000 can receive
corrections from any RTCM base station. Otherwise, the remote
station must be programmed with the same ID number as the base
station the in order to receive corrections from that base station.
The default ID number is 0000.
0000 to 1023
STH Code number indicating the health of the base station. This code
number is a user-entered parameter. This field applies to base
station mode only.
0 to 7
IOD Offset setting for the latest issue of ephemeris data. Applicable to
the base only.
0 to 90
Table 9.3. RTC Response Format (Continued)
Parameter Description Range
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