Appendix b: protocol – EverFocus SPEED DOME EPTZ900 User Manual

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APPENDIX B: Protocol

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Speed Dome Control Protocol

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1-1. Format

A. Fixed 7 bytes packet

Byte1 (cmd1 = 0xFA)

Byte2 (cmd2)

Byte3 (ID high byte)

Byte4 (ID low byte)

Byte5 (data1)

Byte6 (Keyboard-ID)

Byte7 (checksum)

B. Fixed 8 bytes pcket

Byte1 (cmd1 = 0xFC)

Byte2 (cmd2)

Byte3 (ID high byte)

Byte4 (ID low byte)

Byte5 (data1)

Byte6 (Keyboard-ID)

Byte7 (data2)

Byte8 (checksum)

1-2. checksum calculation

1. Address = IDH*32 + IDL

2. Movement Speed: 01-EF ==> begin speed value (01:Slow, EF:Fast)

00 ==> stop

3. checksum ==> B7=(B1+B2+B3+B4+B5+B6)&0x7f

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