Rainbow Electronics ATR0621 - Manual (Page 11)

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4890AS–GPS–09/05
ATR0621 [Preliminary]
3.3.3 Serial I/O Configuration
The ATR0621 features a two-stage I/O message and protocol selection procedure for the two
available serial ports. At the first stage, a certain protocol can be enabled or disabled for a
given USART port. Selectable protocols are RTCM, NMEA and UBX. At the second stage,
messages can be enabled or disabled for each enabled protocol on each port. In all configura-
tions discussed below, all protocols are enabled on all ports. But output messages are
enabled in a way that ports appear to communicate at only one protocol. However, each port
will accept any input message in any of the three implemented protocols.
Both USART ports accept input messages in all three supported protocols (NMEA, RTCM and
UBX) at the configured baud rate. Input messages of all three protocols can be arbitrarily
mixed. Response to a query input message will always use the same protocol as the query
input message.
In Auto Mode, no output message is sent out by default, but all input messages are accepted
at any supported baud rate. Response to query input commands will be given the same proto-
col and baud rate as it was used for the query command. Using the respective configuration
commands, periodic output messages can be enabled.
The following message settings are used in Table 3-6 :
Table 3-6. Serial I/O Configuration
GPSMODE12
(Reset = PU)
GPSMODE6
(Reset = PU)
GPSMODE5
(Reset = PD)
USART1
(Output Protocol/
Baud Rate (kBaud))
USART2
(Output Protocol/
Baud Rate (kBaud)) Messages Information Messages
0 0 0 UBX/57.6 NMEA/19.2 High User, Notice, Warning, Error
0 0 1 UBX/38.4 NMEA/9.6 Medium User, Notice, Warning, Error
0 1 0 UBX/19.2 NMEA/4.8 Low User, Notice, Warning, Error
0 1 1 –/Auto –/Auto Off None
1 0 0 NMEA/19.2 UBX/57.6 High User, Notice, Warning, Error
1 0 1 NMEA/4.8 UBX/19.2 Low User, Notice, Warning, Error
1 1 0 NMEA/9.6 UBX/38.4 Medium User, Notice, Warning, Error
1 1 1 UBX/115.2 NMEA/19.2 Debug All
Table 3-7. Supported Messages at Setting Low
NMEA Port Standard GGA, RMC
UBX Port NAV SOL, SVINFO
Table 3-8. Supported Messages at Setting Medium
NMEA Port Standard GGA, RMC, GSA, GSV, GLL, VTG, ZDA
UBX Port
NAV
SOL, SVINFO, POSECEF, POSLLH, STATUS, DOP, VELECEF,
VELNED, TIMEGPS, TIMEUTC, CLOCK