NavCom Sapphire Rev.J - Manual (Page 178)

Sapphire Technical Reference Manual Rev. J
178
Use “-1” judiciously because it can turn off a potentially large number of
messages.

1
This field is also used to indicate PRN number when the Timing field is ONCE for
the following mnemonics:

EPHEM1B
– the ranges are GPS (1 – 32), GLONASS (38 – 61 for PRN 1 – 24),
SBAS (120 – 138)

RTCM3_1019
– the valid ranges are GPS (1 – 32)

RTCM3_1020 – the valid ranges are GLONASS (1 – 24)
Do not request EPHEM1B, RTCM3_1019, or RTCM3_1020 more often than
once every 60 seconds when requesting all ephemerides.

If this field is 0 or no value, all PRNs are output

If values for the optional arguments (timing, interval, port) are not provided, the
following default values will be used:
timing_mode – ONTIME for CHNLSTATS1B; ONCHANGE for all the other messages
interval – 1 second
port
– the port the [OUTPUT] command was received on
Default: OFF for all messages, except for PANICA, which is turned on for ONCHANGE

Any time interval within the range will be accepted, but the actual interval used is
determined by the software at the nearest interval. Time intervals are limited to the
purchased option rate, or as predefined based on the message type, to limit the
possibility of buffer overflow and processor loading.
Table 73: Output Command Scheduling/Timing Methods
Keyword Mnemonic Scheduling or Timing Method
ONTIME Outputs the message at a rate

the purchased rate
ONCHANGE Outputs the message at the highest rate the system can output
ONEVENT
Output the message whenever an event is detected on the event latch input
circuitry. (This is not currently supported.)
ONCE Outputs the message once as soon as the [OUTPUT] command is received
OFF Stops output of this message for the specified port

If ONTIME is selected, and the interval specified is finer than the rate at which the
data contained in the message are updated, then the message output interval will
average out to the specified interval, rather than occurring exactly at the specified
interval. For example, if the navigation computation rate is set to
10 Hz, but the PVT1B message is scheduled to be output ONTIME every
5.12 seconds, then the interval between consecutive PVT1B messages will dither
between 5.10 seconds and 5.20 seconds, averaging out to 5.12 seconds.