USGlobalsat EM-318-01 - Manual (Page 12)

EM-318-01
Specifications are subject to be changed without notice.
Page 12 of 16
Version 1.2.2
ZDA—PPS timing message (synchronized to PPS)
Outputs the time associated with the current 1 PPS pulse. Each message is output within a
few hundred ms after the 1 PPS pulse is output and tells the time of the pulse that just
occurred
Table B-10 contains the values for the following example:
$GPZDA,181813,14,10,2003,00,00*4F
Table B-10 ZDA Data Format
Name Example Units Description
Message ID $GPZDA ZDA protocol header
UTC time 181813 Either using valid IONO/UTC or
estimated from default leap seconds
Day 14 01 TO 31
Month 10 01 TO 12
Year 2003 1980 to 2079
Local zone hour 00 knots Offset from UTC(set to 00)
Local zone minutes 00 Offset from UTC(set to 00)
Checksum
<CR><LF> End of message termination
■
NMEA Input Command
A.) Set Serial Port ID:100 Set PORTA parameters and protocol
This command message is used to set the protocol (SiRF Binary, NMEA, or USER1) and/or the
communication parameters (baud, data bits, stop bits, parity). Generally, this command is utilize to
switch the GPS module back to SiRF Binary protocol mode, where an extensive message commands
are readily available. In example, whenever users are interested in altering navigation parameters, a
valid message sent and is receive by the recipient module, the new parameters will be stored in
battery backed SRAM and then the receiver will restart using the saved parameters.
Format:
$PSRF100,<protocol>,<baud>,<DataBits>,<StopBits>,<Parity>*CKSUM
<CR><LF>
<protocol> 0=SiRF Binary, 1=NMEA, 4=USER1
<baud> 1200, 2400, 4800, 9600, 19200, 38400
<DataBits> 8,7. Note that SiRF protocol is only valid f8 Data bits
<StopBits> 0,1
<Parity> 0=None, 1=Odd, 2=Even
Example 1: Switch to SiRF Binary protocol at 9600,8,N,1
$PSRF100,0,9600,8,1,0*0C<CR><LF>
Example 2: Switch to User1 protocol at 38400,8,N,1