Granit Protocol (+RRCB~ binary / BB+ replies)
Granit on TCP 5113: +RRCB~ live or +DDAT~ archive binary, XOR star checksum, BB+UGRC~ / BB+ARCF~ replies.
On Traxelio
What Granit trackers do once they are on Traxelio
Hardware that speaks this protocol
Devices that speak Granit
Point this protocol at Traxelio
Point Granit at Traxelio
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1
Capture a Granit fingerprint
Confirm a six-character header +RRCB~ or +DDAT~, not 0x7E 0x7E or $$ text.
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2
Point Granit at 5113
Configure only Granit to TCP 5113. Granit on 5113 is not Ndtp V6 on 5243 or GT30 on 5131.
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3
Expect the BB+ reply
Live +RRCB~ is answered BB+UGRC~. Archive +DDAT~ is answered BB+ARCF~. Both close with a star XOR checksum.
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4
Prove one Granit fix
Send one +RRCB~ structure whose flags bit 7 is set on 5113 and verify a map point.
Still offline after GPS lock
Granit still not landing
- Granit aimed at the wrong port
Granit on 5113 is not Ndtp V6 0x7E 0x7E on 5243 or GT30 $$ on 5131.
- Session up, empty map
Flags bit 7 must be set. A stream with no tilde is stored as a result string and will not plot. A 0xFE filler slot is skipped.
- Archive packs dropped
Archive +DDAT~ is accepted only when the format byte is 4. Other format bytes are dropped.
FAQ
Granit leftover questions
Does Granit send Concox 0x7878 frames?
No. Granit opens with +RRCB~ or +DDAT~ then a packed body. Concox families use 0x7878 binary login.
Which Granit flags bit plots?
Bit 7 of the flags byte. When that bit is off, the row will not plot.
Does Granit send a reply?
Yes. Live +RRCB~ gets BB+UGRC~. Archive +DDAT~ gets BB+ARCF~. Both close with a star XOR checksum.
Where is the Granit unit id?
A little-endian 16-bit value right after the six-character header and the two-byte length.
Can a Granit unit run SMS setup or a controlled-action flow?
This dialect is positions only. C-100, G-100, Navigator 4, Navigator 5, L-100, O-300, and WP-30C are listed. There is no SMS family on this row.