RXM-GPS-R4-T Linx Technologies, RXM-GPS-R4-T Datasheet - Page 16

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RXM-GPS-R4-T

Manufacturer Part Number
RXM-GPS-R4-T
Description
GPS Modules R4 Series GPS Recvr Module Tape and Reel
Manufacturer
Linx Technologies
Datasheet

Specifications of RXM-GPS-R4-T

Rohs
yes
Frequency Band
1575.42 MHz
Number Of Channels
48
Time To First Fix (cold Start)
32 s
Acquisition Sensitivity
- 160 dBm
Horizontal Position Accuracy
2.5 m
Operating Supply Voltage
3.3 V
Operating Supply Current
56 mA
Interface Type
Serial
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Dimensions
15 mm x 13 mm x 2.2 mm
Minimum Operating Temperature
- 40 C
Interfacing with NMEA Messages
Linx modules default to the NMEA protocol. Output messages are sent
from the receiver on the TX pin and input messages are sent to the receiver
on the RX pin. By default, output messages are sent once every second.
Details of each message are described in the following sections.
The NMEA message format is as follows: <Message-ID + Data Payload +
Checksum + End Sequence>. The serial data structure defaults to
9,600bps, 8 data bits, 2 stop bits, and no parity bits. Each message
starts with a $ character and ends with a <CR> <LF>. All fields within
each message are separated by a comma. The checksum follows the *
character and is the last two characters, not including the <CR> <LF>.
It consists of two hex digits representing the exclusive OR (XOR) of all
characters between, but not including, the $ and * characters. When
reading NMEA output messages, if a field has no value assigned to it, the
comma will still be placed following the previous comma. For example,
{,04,,,,,2.0,} shows four empty fields between values 04 and 2.0. When
writing NMEA input messages, all fields are required, none are optional. An
empty field will invalidate the message and it will be ignored.
Reading NMEA output messages:
• Initialize a serial interface to match the serial data structure of the GPS
• Read the NMEA data from the TX pin into a receive buffer.
• Separate it into six buffers, one for each message type. Use the
• For each message, calculate the checksum as mentioned above to
• Parse the data from each message using commas as field separators.
• Update the application with the parsed field values.
• Clear the receive buffer and be ready for the next set of messages.
Writing NMEA input messages:
• Initialize a serial interface to match the serial data structure of the GPS
• Assemble the message to be sent with the calculated checksum.
• Transmit the message to the receiver on the RX pin.
receiver.
characters ($) and <CR> <LF> as end points for each message.
compare with the received checksum.
receiver.
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