Teltonika DualCam

Introduction to the product

Teltonika DualCam is connected to FMX125 and FMU126 devices using the RS232 interface.

Basic characteristics

Technical data	Description
Supported by	FMC125, FMM125, FMU125, FMU126, FMB125
Day & Night Vision Effect	Day (Color), Night (Black & White)
Angle of View	Horizontal 120°, Vertical 70°
Dual Camera	Front and Rear (equal characteristics)
Camera casing dimensions	126.2 x 36.6 x 36.6 mm
Camera mounting	Sticky tape (3M) or screws

Electrical parameters	Description
Input voltage range	9 ~ 36 V
Working temperature and humidity	Temperature: 30 °C ~ 85 °C Humidity: <90%
Stand-by electric current	60 mA

Function parameters	Description
Real time clock (RTC) synchronization	Available over FM (via NTP, NITZ or GNSS)
Picture resolution	1280 x 720 (default) (50KB transfer period 18 sec), Configurable: 160 x 120; 320 x 240; 640 x 480; 1920 x 1080
IR Distance	2 Meters
Cable length	RS232 (3.5 m)
Video compression	H.265
Video resolution	720P (20 sec. – 6MB, transfer period ~ 320 sec.)
Video storage	2psc. MicroSD card (Max 64G up to 72 hours of video)

Installation

To connect the DualCam to a supported device, you have to make sure to connect 4 PINs of the camera to the PINs of your device correctly.

PIN NUMBER	PIN NAME	DESCRIPTION
1	RS232-Tx	DualCam output for data transmission through RS232
2	RS232-Rx	DualCam input for data reception through RS232
3	VCC(9-36V) (+)	Power supply for the DualCam
4	GND (-)	Ground

DualCam RS232 camera support

DualCam camera support was introduced from firmware version 03.27.00.Rev.100. A new RS232 mode "DualCam" was added with parameters for setting control. The details of the RS232 mode parameter are provided in the table below.

Parameter name	Parameter ID	Parameter value
RS232 Mode	151	18

Camera Feature Settings

Once this mode is enabled, new tab “Camera Settings” appears on the left sidebar. This will contain the main parameters for configuring the camera settings The parameter IDs and values are provided in the table below. Once configuration is saved to device, these parameters are updated.

Parameter name	Parameter ID	Parameter values	Default values
Camera Picture Resolution	66000
		0 - 160 x 120	3
		1 - 320 x 240
		2 - 640 x 480
		3 - 1280 x 720
		4 - 1920 x 1080
Camera Picture Compression	66001	[0 - 100] (%)	50
OSD Display	66002	0 - Disabled	0
		1 - Enabled
Video Frame Rate	66003	[1-30] (frames per second)	30

OSD display - On Screen Display feature displays date and time in the upper left corner of the photo. This feature can be enabled or disabled.

Camera Scenario Settings

"Camera settings" tab also contains scenario settings that trigger camera video/photo capture when specific condition is met.

Parameter name	Parameter ID	Parameter values	Default values
Periodic Image sending	66006	0 - Disabled	0
		1 - Enabled
Sending interval	66007	[10-1800] (seconds)	600
Video sending trigger	66008
		0 - None	0
		1 - DIN1
		2 - DIN2
		3 - Crash
Video duration before trigger	66009	[1-10] (seconds)	5
Video duration after trigger	66010	[1-10] (seconds)	5

Periodic image sending scenario

Periodic image sending triggers photo capture from a front camera, whenever the timeout is reached (sending interval parameter). If a camera has not finished uploading picture to a server, then the photo capture is skipped.

Video sending by trigger

Video sending by trigger scenario monitors the selected trigger (video sending trigger parameter) and captures video before and after the event (video duration before trigger and video duration after trigger parameters). If the previously captured video has not finished downloading, then a new video capture is skipped until the old one has been sent. When this scenario is triggered, high priority eventual record is generated with the value corresponding to what triggered the scenario. See the table below.

Parameter name	Parameter ID	Parameter value
SOS trigger	499	0 - Server request
		1 - DIN1
		2 - DIN2
		3 - Crash

Camera request command

A new camera request has been added, which allows server to request files from a camera. The format is as provided below in the table:

Command	Arguments	Explanation
camreq:	<file_type>,<file_source>,<timestamp>,<duration>	Captures appropriate file with the provided details. If the connection to server is opened, them files immediately become available for download. If not, then connection is tried to be made.

The arguments are as follows:

• <file_type>
  • 0 - Video
  • 1 - Photo
• <file_source>
  • 1 - Front camera
  • 2 - Rear camera
  • 3 - Both cameras
• <timestamp>
  • Unix timestamps in decimal (not required for photo download)
• <duration>
  • Video duration in seconds from provided timestamps (not required for photo download), (max 30 sec)

Conditions	Command response
Arguments are invalid	Invalid argument in camera request cmd!
Photo requested	Request for photo from source <1-3> received
Video requested	Request for video from source <1-3> received for <1-30> seconds since YYYY-MM-DDHH:MM:SS

Camera ping transmission and TF status checking

Camera pinging was implemented to periodically check if a camera is connected to a device. This is done via “Get TF status” command for both front and rear camera every 20 seconds when ignition is on. The received result from this command is stored in two corresponding AVL elements “Front camera state” and “Rear camera state”. The following do not only store TF status, but also if response from the camera was received or not.

Parameter name	Parameter AVL ID	Parameter values
Front camera state:	498	0 - Camera not detected
		1 - No card
Rear camera state:	497
		2 - Card mount failed
		3 - Card failed
		4 - Card faulty

Camera RTC synchronization

Camera RTC synchronization is done anytime the device itself is synchronized (via NTP, NITZ or GNSS).

Other camera related functionality

Camera is configured if all of these conditions are met:

1. RS232 mode is selected (DualCam)
2. Camera was not configured since startup or one of the related parameters were changed (compression, framerate or OSD)
3. Camera file transfer is not active

Active camera reconfiguration is accompanied by two consecutive camera shutter clicks. If camera is disconnected and later reconnected, a device will detect it by periodic camera ping packet. Once camera is detected, the device will reissue the reconfiguration procedure.

Camera file transfer reconnection

If FMU1YX device has bad reception, server is not reachable or wrong server details are configured, then the device tries to open a link to a camera server few consecutive times. If no connection was possible to be established, then the connection is postponed for 30 minutes and tried again (or tried every configured sending interval if periodic image sending is enabled).

DualCam camera file transfer support

Once camera has at least one file captured, it starts connection to a remote server, which is configured by parameters “Domain” and “Port” found in the “Camera Settings” tab.

Initialization packet

On connection, a device sends an initialization packet.

Header(0x0000)	Protocol ID	IMEI	Settings
2 bytes	2 bytes	8 bytes	4 bytes

Protocol ID – just a reference for the protocol version that is running on a device (for server cross compatibility with older versions). Firmware FMB.Ver.03.27.00.Rev.100 and up have protocol ID 5. Settings flag contains information on what is available for download. Structure is provided below:

Settings, 4 B
Byte 3								Byte 2								Byte 1								Byte 0
		1	2	3	4

1. Video, rear (%videor)
2. Video, front(%videof)
3. Photo, rear (%photor)
4. Photo, rear (%photor)

If identifier sent to a server is not valid, device disconnects.

General command structure

General communication packet structure is as in the table bellow. It consist of CMD_ID (2 bytes), Data length of a command and a payload.

Command ID	Data length	Data
2 bytes	2 bytes	[data length] bytes

Communication protocol

Close a session command (CMD ID 0x0000)
In case when a device connects to a server, but the server does not expect it to connect, server will respond by sending a CLOSE command after which the connection will be terminated. This command is also used when device connects to a server for a custom file sending and server finishes to send all custom files to the device.

Command ID	Data length
0x0000	0x0000

Start file transfer command (CMD ID 0x0001)
After device is connected for a file download, server initiates file transfer by sending a START command.

Command ID	Data length	File Packets (4 bytes)	File CRC (2 bytes)
0x0004	0x0006	0x12345678	...

File request command (CMD ID 0x0008)
After device is connected for a file upload, server initiates file transfer by sending a FILE REQ command.

Command ID	Data length	File Identifier
0x0008	2 bytes	See the table below

Device should answer with a START command described above indicating a size and CRC of the requested file.

File source, type	Identifier (ASCII chars)
Photo from camera, rear	%photor
Photo from camera, front	%photof
Video from camera, rear	%videor
Video from camera, front	%videof

Resume file transfer command (CMD ID 0x0002)
In a response to the START command a RESUME command must be sent from a server.

Command ID	Data length	Packet offset (4 bytes)
0x0002	0x0004	0x00000000

To begin a file transfer from the start, offset should be set to zero (4 bytes value). In case when the file transfer has been interrupted, to resume file transfer, offset can be set to the desired value (0 ≤ [offset] ≤ [file size]).

Synchronize file transfer command (CMD ID 0x0003)
In a response to the RESUME command a SYNC command is sent from device.

Command ID	Data length	File offset (4 bytes)
0x0003	0x0004	0x00000000

By sending a SYNC command, it is ensured that the next data command will contain a file data starting from the specified offset.

File data transfer command (CMD ID 0x0004)
After sending a SYNC command, a file data transfer is started by sending DATA commands.

Command ID	Data length	File data (up to 1024 bytes)	Data CRC (2 bytes)
0x0004	0x0402	...	...

A File data is split into 1024 byte parts, each part wrapped into a DATA command and is sent.
Note: if a command with a bad CRC is received, RESUME command should be sent with the last valid file offset, after receiving a RESUME command, server will stop sending DATA commands and continue communication from “Resume file transfer” step.
CRC polynomial expression: 0x8408 Initial value, when calculating CRC, is previously received packet (CMD ID 0x0004) CRC value.

File transfer status command (CMD ID 0x0005)
After a file transfer is completed and no more files are required from the device, a server should send a COMPLETED command to the device (this command does not work after executing repeat init command0 x0009 – in this case the server should send a CLOSE SESSION 0x0000 command mentioned before).

Command ID	Data length	Status (4 bytes)
0x0005	0x0004	0x00000000

In case of the server using invalid arguments, commands or not following the file request flow, the device will send this command with a Status field set to one of the few possible error codes. List of possible ones is provided below.

Status value (hexadecimal)	Description	Notes
0x00000000	File transfer process completed	Sent from server
0x00000002	Failed to close GPRS	Sent from device
0x00000003	Failed to close socket	Sent from device
0x00000005	Invalid response from server to init packet	Sent from device
0x00000011	This error code forces the device to disconnect from server	Sent from device. Possible causes: Camera is not configured The requested file is not available by camera

After a COMPLETED command device should disconnect from the server.

Initialization packet repeat command (CMD ID 0x0009)
When sent, the initialization packet is repeated. This is used, when all of the files are downloaded and additional check is carried out for any additional files, that may have been captured during the download operation.

File transfer visual flow