SRT X-BAND RADAR SYSTEMS
OPERATION
304202P003 2.3 Rev. C
2.4 NMEA Transfer Protocol
2.4.1 Abbreviations
RDC Radar Display Console
TXRX Transceiver (TX/RX)
CRC Checksum Field
Field Type
Field type Symbol Definition
Status A A = Yes, data valid, warning flag clear.
V = No, data invalid, warning flag set.
Variable Numbers x.x Variable length integer or floating numeric field. Op-
tional leading and trailing zeros. The decimal point
and associated decimal fraction are optional if full
resolution is not required (example: 73.10 = 73.1 =
073.1 = 73).
Fixed HEX field hh- Fixed length HEX number only, MSB on the left.
Variable text c—c Variable length valid character field.
Fixed alpha field aa- Fixed length field of upper-case or lower-case alpha
characters.
Fixed number field xx- Fixed length field of numeric characters.
Fixed text field cc- Fixed length of valid characters.
• NOTE ¹ Spaces shall only be used in variable text fields.
• NOTE ² A negative SIGN “-“ (HEX 2D) is the first character in a field if the value is
negative. When used, this increases the specified size of fixed length fields by one.
The sign is omitted if the value is positive.
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