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Lassen-SK8 Embedded GPS Module A-55
Trimble Standard Interface Protocol
A.17.52 Command Packet 0x7A
The NMEA message mask is a 32-bit vector which determines whether or not a given
NMEA message will be output. If the bit for a message is set, the message will be sent
every “interval” seconds.
Hex values are “0R”ed together to produce the desired combined output mask. For
example, a mask value of 0x00000005 would mean GGA and VTG messages are enabled
for output (the default mask), and a mask value of 0x00000013F would mean all of the
messages are enabled for output. The Hex values used to request the NMEA interval and
message mask are listed below.
GGA: 0x00000001
GLL: 0x00000002
VTG: 0x00000004
GSV: 0x00000008
GSA: 0x00000010
ZDA: 0x00000020
RMC: 0x00000100
See A.3 for information on saving the settings to non-volatile memory.
To set the NMEA interval and message mask:
Table A-60. Command Packet 0x7A Data Formats
Byte Item Type Value Meaning
0 Subcode BYTE 0
Table A-61. Command Packet 0x7A Data Formats for Setting NMEA
Interval and Message Mask
Byte Item Type Value Meaning
0 Subcode BYTE 0
1 Interval BYTE The time in seconds between NMEA
messages (position fix rate if 0)
2-5 Output
mask
UNSIGNED
LONG INT
The NMEA bit-mask for outputting
messages