Adding info on Anjvision Network Movement Board

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Communication Protocol

Anjvision Network Movement Board — MCU ↔ IPC Serial Interface
Translated from the original Chinese specification (Anjvision AF protocol, v2023101001).

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1. Communication Parameters

Interface	Parameter	Baud rate	Data bits	Parity	Stop bits
UART	Value	57600 bps	8	NONE	1

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2. Communication Protocol (Frame Format)

Every frame follows a fixed structure: start bytes, a read/write command, a data type, a data length, the payload, and a trailing checksum byte.

Start bytes (Data1)	Read/Write cmd (Data2)	Data type (Data3)	Data length (Data4)	Data content (Data5–Datan)	CheckSum (Data n+1)
0x51 0x01 0x04 (3 bytes)	1 byte: 0x78 (write) / 0x79 (read)	1 byte	1 byte	length given by Data4	1 byte

Notes

1. CheckSum is the low 8 bits of the sum of all preceding bytes:

   CheckSum = (Data1 + Data2 + Data3 + … + Datan) & 0xFF
   

2. All parameter values shown in the command descriptions below are in hexadecimal.

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2.1 Set IPC Colour Mode

MCU request (MCU → IPC)

No.	Field	Length (byte)	Description
1	Start bytes	3	0x51 0x01 0x04
2	Read/write cmd	1	0x78
3	Data type	1	0x11
4	Data length	1	0x01
5	Data	1	0: COLOUR  1: B/W
6	CheckSum	1

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2.2 Quick-Clear IPC OSD Display

MCU request (MCU → IPC)

No.	Field	Length (byte)	Description
1	Start bytes	3	0x51 0x01 0x04
2	Read/write cmd	1	0x78
3	Data type	1	0x02
4	Data length	1	0x01
5	Data	0	0x00
6	CheckSum	1

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2.3 Display OSD Data on IPC

MCU request (MCU → IPC)

No.	Field	Length (byte)	Description
1	Start bytes	3	0x51 0x01 0x04
2	Read/write cmd	1	0x78
3	Data type	1	0x01
4	Data length	1	variable
5	Data	variable	line (row); cow (column); n... : string to display
6	CheckSum	1

"n" is the character content to display:

Data[n] = {"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ!?(none)&(),.:;(none)*%+-X/=\"`(none)(none) "};

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2.4 Display OSD Data on IPC (UTF-8 variant)

MCU request (MCU → IPC)

No.	Field	Length (byte)	Description
1	Start bytes	3	0x51 0x01 0x04
2	Read/write cmd	1	0x78
3	Data type	1	0xE1
4	Data length	1	variable
5	Data	variable	line (row); cow (column); n... : string to display
6	CheckSum	1

"n" is the character content to display, encoded as UTF-8. The text is shown centred on the bottom row; its size does not change with the video stream.

OSD — Detailed Description

1. The display area is 13 rows × 30 columns, centred on the image.

2. Example data sent from the MCU to the IPC, producing the display below; this can also be sent over a serial terminal for testing:

   51 01 04 78 01 07 03 02 01 02 03 04 05 EA
   51 01 04 78 01 05 04 04 0A 0B 0C FD
   

What the reference photo shows (screen capture of a camera's on-device menu, used here as a schematic description instead of an image):

Screen element	Content
Top line	CAMERA: I161121 1
Menu item 1	1. ZOOM DISPLAY ON
Menu item 2	2. FOCUS MODEL AUTO
Menu item 3	3. BOX ADJUST
Menu item 4	4. MAIN MENU
Menu item 5	5. RETURN
Selection marker	* next to the currently highlighted item (item 1)
Style	White monospaced OSD text overlaid on a plain grey/blurred camera background

Resulting on-screen layout referenced in the two example frames above (row / column position markers):

Col 1	Col 2	Col 3	Col 4	Col 5
1	2	3	4	5
		A	B	C

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3. IPC-Initiated Data to MCU (IPC → MCU)

3.1 Read IPC AF Data

IPC request (IPC → MCU)

No.	Field	Length (byte)	Description
1	Start bytes	3	0x51 0x01 0x04
2	Read/write cmd	1	0x78
3	Data type	1	0x01
4	Total length	1	0x0D
5	AF data	4	Byte1: overall AF, high byte; Byte2: overall AF, low byte; Byte3: zone AF, high byte; Byte4: zone AF, low byte
6	AGC value	1	Current sensor gain value
7	IRCUT status	1	0: colour  1: B/W
8	Low nibble: IRCUT mode / High nibble: fill-light mode	1	IRCUT control mode: 0 auto, 1 day/night (time-based), 2 external control, 3 manual. Fill-light mode: 0 IR only, 1 white light only, 2 smart dual light
9	IR brightness	1	0–100 (decimal); 0 = IR off; 100 = max IR brightness
10	White-light brightness	1	0–100 (decimal); 0 = white light off; 100 = max white-light brightness
11	CheckSum	1

Examples

Frame (hex)	Meaning
51 01 04 78 01 0D 0B 05 02 16 01 00 00 00 00 05	Auto, IR only (day)
51 01 04 78 01 0D 0B 05 02 16 01 01 00 64 00 05	Auto, IR only (night)
51 01 04 78 01 0D 0B 05 02 16 01 00 00 00 00 05	Auto, white light only (day)
51 01 04 78 01 0D 0B 05 02 16 01 00 00 00 64 05	Auto, white light only (night)
51 01 04 78 01 0D 0B 05 02 16 01 00 00 00 00 05	Auto, dual light (day)
51 01 04 78 01 0D 0B 05 02 16 01 01 00 64 00 05	Auto, dual light (night, no person)
51 01 04 78 01 0D 0B 05 02 16 01 00 00 00 64 05	Auto, dual light (night, person present)

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