2 Funkprotokoll

BlubbFish edited this page 2020-09-17 11:41:08 +02:00

Unescape Escape

Table of Contents

• Funkprotokoll für die Zeitschaltung
• Specs
• Aufbau
• SYNC
• HDB
• DAB
• SAB
• DB
• CRC
• Addresses
• Querys
• Responses

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Funkprotokoll für die Zeitschaltung

Specs

• Scakeabke Node Address Protocol
  • http://www.hth.com/snap/
  • http://www.hth.com/filelibrary/pdffiles/snap.pdf

Aufbau

• CRC-8
• 3 Data-Bytes (1 Command-Byte, 2 Daten-Bytes)
• All Byte Descriptions are in LSB 2.0 Protocol description.

SYNC Synchronization byte
HDB2 Header Definition Byte 2
HDB1 Header Definition Byte 1
DAB1 Destination Address Byte
SAB1 Source Address Byte
DB3 Data Byte 3
DB2 Data Byte 2
DB1 Data Byte 1
CRC1 High byte of CRC-8

SYNC

2.1 Synchronization byte - SYNC. 0b01010100

HDB

2.2 Overview of header definition bytes (HDB2 and HDB1).

• HDB2 0b01010000
  • DAB = Number of Destination Address Bytes (8,7 Bit) [1 Byte destination address]
  • SAB = Number of Source Address Bytes (6,5 Bit) [1 Byte source address]
  • PFB = Number of Protocol specific Flag Bytes (4,3 Bit) [0 Byte flags]
  • ACK = ACK/NAK bits (2,1 Bit) [No ACK request (Tx)]
• HDB1 0b10110011
  • CMD = CoMmanD mode bit (8 Bit) [indicates that the data in DB1 contains a command]
  • EDM = Error Detection Method (7,6,5 Bit) [8-bit CRC]
  • NDB = Number of Data Bytes (4,3,2,1 Bit) [3 Bytes]

DAB

Address 0 is reserved as a broadcast address and should not be used for anything else. Otherwise that is the destination address of the node.

SAB

Source Address of that Node. If a Node hasn't a address it should use ´0xFF´

DB

• DB1 (0x02-0x7F Query, 0x82-0xFF Responses)
• DB2 (1 Data-Byte, if not needed = 0)
• DB3 (2 Data-Byte, if not needed = 0)

CRC

• http://code.google.com/p/avr-code/source/browse/trunk/thermo/crc8.c

Addresses

• Brodcast-Address: 0x00
• No Address Definded: 0xFF
• Controllers: 0xD0-0xE0
• Actors: 0x10-0xAF All others are reserved for future use!

Querys

• 0x02: Status Request (Data: none)
• 0x03: Request Set Address (Data: none) [the only vaild command that can send with SAB 0xFF]
• 0x04: Request Set Capabilitys (Data: none)

Responses

• 0x82: Status Response (Data: 1 Byte; 0x01 Ready, 0x02 Armed, 0x03 Ilde)
• 0x83: Set Adress (Data 1 Byte; Address)
• 0x84: Set Capability (Data 1 Byte, Bit 1: Servo, Bit 2: Motor, Bit 3: Quickstart-Button, Bit 4-8: Reserved)