Novatel OM-20000041 用户手册
4
Message Formats
MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1
49
RTCM Standard Commands
RTCMRULE
The
RTCM
standard states that all equipment shall support the use of the "6 of 8" format (data bits a
1
through a
6
where bits a
1
through a
6
are valid data bits and bit a
7
is set to mark and bit a
8
is set to space).
The GPSCard
RTCMRULE
command allows for flexibility in the use of the bit rule to accommodate compatibility
with equipment that does not strictly adhere to the
RTCM
stated rule.
Syntax:
Example:
rtcmrule 6cr
RTCM16T
This is a NovAtel GPSCard command which relates to the
RTCM
Type 16
This command allows the GPSCard user to set an ASCII text string. Once set, the text string can be transmitted as
standard format
standard format
RTCM
Type 16 data (see the
RTCM16
log, Page 53). The text string entered is limited to a maximum
of 90 ASCII characters. This message is useful for a reference station wanting to transmit special messages to
remote users.
remote users.
The text string set here can be verified by observing the
RCCA
command configuration log. As well, the message
text can be transmitted as a NovAtel Format ASCII log by utilizing the "LOG port RTCM16T" command.
Syntax:
Example:
rtcm16t This is a test of the RTCM16T Special Message.
RTCM Standard Logs
The NovAtel logs which implement the RTCM Standard Format for Type 1, 3, 9, and 16, 18, 19 and 22 messages
are known as the RTCM1 (or RTCM), RTCM3, RTCM9, RTCM16, RTCM1819 and RTCM22 logs, respectively,
while Type 59N-0 messages are listed in the RTCM59 log.
are known as the RTCM1 (or RTCM), RTCM3, RTCM9, RTCM16, RTCM1819 and RTCM22 logs, respectively,
while Type 59N-0 messages are listed in the RTCM59 log.
NovAtel has created ASCII and binary versions of each of these logs so that RTCM data can be sent or received
along with other NovAtel ASCII and binary data over a common communications port. As per the usual
along with other NovAtel ASCII and binary data over a common communications port. As per the usual
RTCMRULE rule
Syntax
Range Value
Description
Default
RTCMRULE
-
Command
rule
6CR
6CR is for 6 bits of valid data per byte. Each frame is followed by a <CR> character.
6CR
6SP
6SP (6 bit special); the RTCM decoder of the remote receiver will ignore the two MSB of the
data and hence all 6 bit data will be accepted. This allows users with non-conforming 6 bit rule
data to use the NovAtel receiver to accept their RTCM data. The user will not be allowed to
enter extra control data such as CR/LF, as this will be treated as RTCM data and cause the
parity to fail. This option does not affect RTCM generation. The output will be exactly the same
as if the RTCMRULE 6 option was chosen. The upper two bits are always encoded as per
RTCM specification.
data and hence all 6 bit data will be accepted. This allows users with non-conforming 6 bit rule
data to use the NovAtel receiver to accept their RTCM data. The user will not be allowed to
enter extra control data such as CR/LF, as this will be treated as RTCM data and cause the
parity to fail. This option does not affect RTCM generation. The output will be exactly the same
as if the RTCMRULE 6 option was chosen. The upper two bits are always encoded as per
RTCM specification.
6
6 is for 6 bits of valid data per byte
8
8 is for 8 bits of valid data per byte
RTCM16T
message
Syntax
Range Value
Description
RTCM16T
-
Command
message
up to 90 characters
ASCII text message