u-blox ANTARIS 4 - Page 80


your position is our focus
Possible Asynchronous Serial Interface Configurations Data bit Parity bit Stop bit
Baudrate 
9’600
19’200
38’400

8 N 1
 4’800
57’600
115’200
Table 22: USART configuration
Th baud rates can be set individually for eachSerial Port. Different
pr tocolsonthesameportarenotsupported.
e  baud rates for RXandTX or fordifferent
o
norm 1Stopbit,usuallyshortnamed‘8N1’)
gleby
A aldatatransmission(withaconfigurationof8Databits,NoParity,
ofasin telooksasfollows:
D0 D1 D2 D3 D4 D5 D6 D7
Startof1-Byte
(Always0)
transfer
StartBit
PossibleSt art of
(Alw ays1)
next transfer
Sto pBit
t
bit
=1/(Baudrate)
al Transfer, 8N1

4.4.1.1 Error Conditions on USART Ports
 such as NMEA or UBX, it does not make sense to change the default values of
rdLengthorBitOrder,sincethesepropertiesaredefinedbytheprotocol,notbytheelectricalinterface.
 t
 messages may be discarded
illbetransmittedcompletely
tbetransmittedinthenextsequence.
4.4.
e ortto useanautobaudingmechanism.This mechanism getsactive
if
e
If multiplebreak conditions areencountered, thebaud rateoftheserial port is reduced tothe nextlower
standardbaudrate
• Ifthereceiverdetects multipleframingerrors,the baudrate isincreased tothe nexthig herstandard baud
rate.

! Warning Don’tusetheu-centerAEautobaudingfeatureiftheGPSreceiverautobaudingisenabled.
! Warning Someserialportcards/adaptersfrequentlygenerateerrors.Theu-centerautobaudingmaynotwork
reliablyinthiscase.Ifyouexperiencefrequenterrors,pleasesetthebaudratemanually.
Norm
Figure 67: Definition USART data packets
Please note that for protocols
Wo
No e If the baud rate is insufficient to transmit all enabled
messages, some
andnottransmitted.Thereceiverdoesnotcheckwhetheramessagew
intheremainingtime.Discardedmessageswon’
1.2 Autobauding
Th  usercan individuallyconfigureeachp
th receiverindicatesanerrorwhenreceivingdata.
•
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 80