Encoder Modulator Decoder Demodulator Module Parameter Configuration Instructions COFDM AT Command
Encoder Modulator Decoder Demodulator Module Parameter Configuration Instructions COFDM AT Command
Download the Encoder Modulator Decoder Demodulator Module Parameter Configuration Instructions below if you need a PDF file.
Update Record:
| Version | Date | Description |
| 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 | 2016-10-24 2016-11-1 2016-12-26 2017-2-14 2017-2-28 2017-3-27 2017-4-19 2017-5-18 2017-9-12 2018-3-15 2019-6-25 2023-2-24 | Initial version ATDR reply distinguishing module ATSE, ATGE add audio switch Add ATSP protocol Add ATST, ATGT protocol ATGE command add AESfor status acquisition Added ATGB protocol AV and HDMI output control Support for obtaining the current AV output standard Added ATSU, ATGUcommands Added ATOSD, ATSIP, ATGIP commands Added ATSAD, ATGAD commands |
Users may need to modify the configuration parameters of the module during the use of the COFDM modulator and demodulator module. In order to simplify the user’s operation, we design the parameter configuration into a few simple AT commands. The user only needs to use the specified AT command and pass the corresponding parameters to complete the parameter setting of the COFDM module.
Suitable Models
-
COFDM Relay Repeater module for drone UAV wireless video transmitter and receiver Vcan1870 -
COFDM Modulator Demodulator Module Encoder Decoder HDMI CVBS AV Input AES 256 FHD RF streaming -
Wireless Video Transmitter and Receiver for Camera, HDMI HD H265 264 encoder 1W/2.5W PA 1080P60 Vcan1726 -
HDMI To IP encoder modulator CVBS H.265 H.264 encoding board pcba Ethernet RSTP UDP for UAV Drone Robotic
Command Introduction
The AT command for configuring COFDM module parameters starts with “AT” and ends with an underscore “_”. Each AT command has several or no parameters, and each AT command has a return value. For details, please refer to the introduction of the following commands.
Users can configure the parameters of the module through the configuration serial port (TTL level, 3.3V) of the COFDM module. For detailed serial port configuration, refer to the figure below. Please use tools such as “Serial Port Debugging Assistant” to send AT commands to the COFDM module, pay attention to the use of text, for example:
Command Classification
The AT commands for configuring COFDM module parameters are mainly divided into the following two categories:
| Query Commands | ATDR, ATGD, ATGE, ATGI , ATGR, ATGT, ATGB, ATGU, ATGIP |
| Setting Commands | ATSD, ATSG, ATSM, ATSE, ATSI, ATSO, ATSR, ATSP, ATST, ATSU,ATOSD, ATSIP |
From the perspective of whether to save after power-off, the setting commands can be divided into:
| Power-off Saving Commands | ATSD, ATSE, ATSI, ATSO, ATSR, ATSP, ATST, ATSU, ATSIP |
| Power-off Not Saving Commands | ATSG, ATSM, ATOSD |
According to the configuration transmitter or receiver, the classification is as follows:
| Sender Configuration Commands | ATDR, ATSD, ATGD, ATSG, ATSM, ATSE, ATGE, ATSI, ATGI, ATSO, ATSP, ATST, ATGT, ATSU, ATGU, ATOSD |
| Receiver Configuration Commands | ATDR, ATSR, ATGR, ATSP, ATST, ATGT, ATGB, ATSIP, ATGIP |
Command Details
Ping Command
| Format | ATDR_ |
| Parameter | No |
| Use | for the integrated system to check whether the serial port is connected and identify the connected modules. |
| Return value | RCB returns the “device profile” string SUE1 returns “ATDRSUE1 OK” string SHD1 returns “ATDRSHD1 OK” string |
| Remark | query command |
Set Device Command
| Format | ATSD $(mimo), $(gi), $(code_rate), $ (constellation), $(freq(KHz)), $(bw(KHz)), $(tx1_gain), $(tx2_gain)_ Example: ATSD0,1,0,0,800000,8000,86.0,86.0_ |
| Parameter | One Antenna/Dual antenna mimo: 0 mimo disable; 1 mimo enable Guard Interval GI: 0 1/32; 1 1/16; 2 1/8; 3 1/4 Convolution Code Rate: 0 1/2; 1 2 /3; 2 3/4; 3 5/6; 4 7/8; Constellation: 0 QPSK; 1 QAM16; 2 QAM64; RCB Carrier Center Frequency(kHz) 200000~2700000(200MHz~2.7GHz, 1KHz step) RC900 Carrier center Frequency(kHz) 750000~930000(750MHz~930MHz, 1KHz step) RCB Channel bandwidth bw(KHz) 2000~8000(2MHz~8MHz, 1KHz step) RCB Channel bandwidth bw(KHz) 2000~8000 (2MHz~8MHz, 1KHz step) Transmitting antenna 1 gain tx1_gain 0.0~89.75dB, 0.25dB stepping Transmitting antenna 2 gain tx2_gain 0.0~89.75dB, 0.25dB stepping |
| Return Value | such as:ATSD0,1,0,0,800000,8000,86.0,86.0_ SISO,GI: 1/16, CR:1/2, MOD: QPSK, freq:800000KHz,bw:8000KHz,tx1_gain:86.000000 tx2_gain:86.000000 OK |
| Note | Set command, save when power off. Different Bandwidths, Guard intervals, Convolution code rates, Data rate calculation formulas corresponding to constellations Air interface rate Rate(MBps) = (BandWidth(MHz) * 8.0/7.0) / (1+GI) * 1512/2048*log2(constellation point) * code_rate * 188/204. Taking 8MHz bandwidth as an example, different guard intervals, convolution code rates, data rates corresponding to constellations and required receiving signal-to-noise ratios  |
Set Gain Command
| Format | ATSG$( tx1_gain),$( tx1_gain)_ Example: ATSG85.0,85.0_ |
| Parameter | tx1_gain: Transmitter 1 gain tx2_gain: Transmitter 2 gain |
| Use | To dynamically adjust the output power. If the signal SNR/RSSI of the receiver is high, the output power can be reduced through the remote control link. When the SNR/RSSI of the end signal is low, increase the output power (transmitter) |
| Return Value, | Example: ATSG85.0,85.0_set gain 85.000000 85.000000 OK |
| Remark | setting command, power off will not save. |
Set Modulation Mode command
| Format | ATSM$(gi), $(code_rate), $(constellation)_ Example: ATSM1,1,2_ |
| Parameter | Gard interval GI: 0 1/32; 1 1/16; 2 1/8; 3 1 /4; Convolution code rate: 0 1/2; 1 2/3; 2 3/4; 3 5/6; 4 7/8; Constellation: 0 QPSK; 1 QAM16; 2 QAM64 |
| Use | Dynamically adjust the air interface rate, the air interface rate can be increased when the distance is short, and the air interface rate can be reduced when the distance is long (transmitter) |
| Return Value | Example:ATSM1,1,2_GI:1/16, CR:2/3, MOD: QAM64, OK |
| Remark | setting command, power off will not save. |
Get Device Status Command
| Format | ATGD_ |
| Parameter | No |
| Use | query the current number of transmit antennas, guard interval, convolution code rate, number of constellations, transmit frequency, bandwidth, gain parameters (transmitter) |
| Return Value | Example: ATGD_ SISO, GI:1 /16, CR: 1/2, MOD: QPSK, freq: 800000KHz, bw: 8000KHz, tx1_gain: 86.000000 tx2_gain: 86.000000 OK |
| Remark | query command |
Set Encoder Command
| Format | ATSE$(llc),$(rt),$(bitrate) ,$(gop),$(audio)_ Example: ATSE0,0,0.0,0,0_ |
| Parameter | 1. Enhanced data reliability option llc: 0 disable; 1 enable (requires the receiving end to enable this option at the same time, use in pairs, because more redundant data is added to enhance reliability, the video bit rate of the transmitting end should be set when this option is turned off half of) 2. Real-time priority/quality priority rt: 0 image quality priority; 1 real-time priority; 3. Bitrate: 0 let system decide; >0 specify bitrate(float) 4. I frame interval GOP: 0 let system decide; >0 specify GOP 5. Audio encoding option audio: 0 disable; 1 enable |
| Use | Used to set encoding parameters (Transmitter) |
| Return Value | Example:ATSE0, 0,0.0,0,0_ MODE:0,RT:0,bitrate: 0.0Mbps,gop:0,audio:0,OK |
| Remark | setting command, save when power is off. |
Get Encoder Command
| Format | ATGE_ |
| Parameter | No |
| Use | querying encoding parameters (sending end) |
| Return Value | Example:ATGE_MODE:0, RT:0,bitrate:4.0Mbps,gop:10,audio:0,aes:0, OK |
| Remark | Query command AES means the current encryption status: 0 disable; 1 enable |
Get Input Command
| Format | ATGI_ |
| Parameter | No |
| Use | query the current camera input parameters (transmitter) |
| Return Value | Example:ATGI_input_size: 1080p, input_rate: 60fps, sensor_type: hdmi,OK |
| Remark | query command |
Set Input Command
| Format | ATSI$(input_size),$(input_rate)_ Example: ATSI1080,25_ |
| Parameter | 1. Input resolution input_size: 0 let the system detect; >0 specify input size 2. Input frame rate input_rate: 0 let the system detect; > 0 specify input fps |
| Use | To specify the input resolution and frame rate to meet some special signal sources, or some special application needs (transmitter) |
| Return Value | Example: ATSI1080,25_ Input_size:1080p,input_rate: 25fps, OK |
| Remarks | After the user specifies the input resolution and frame rate through this command, the system will no longer detect the signal source (use with caution). The user can restore the default through the following command: ATSI0,0_Set the command and save it after power-off. |
Set Output Command
| Format | ATSO$(output_size),$(output_rate)_ Example: ATSO720,30_ |
| Parameter | 1. Transmitter: encoding output resolution output_size: 0 equal to input_size; >0 specify output size 2. Receiver: HDMI output resolution (720, 1080) 3. Transmitter: encoding output frame rate output_rate: 0 equal to input_rate; >0 specify output_rate (fps) 4. Receiver: HDMI output frame rate 720p supports frame rate (50, 60); 1080p supports frame rate (24, 25, 30, 50, 60) |
| Use | 1. Transmitter: Used to specify the encoding output resolution and frame rate to meet the requirements of certain applications for zooming and frame reduction 2. Receiver: used to configure the resolution and frame rate of HDMI output |
| Return Value | Example: ATSO720,30_ output_size: 720p, output_rate: 30fps, OK |
| Remarks | 1. For HDMI input only, this command is invalid for AV input 2. Output_size <= input_size; output_rate<=input_rate 3. Set the command and save it after the power is off. |
Set Input Sources Command (switch HDMI / CVBS input)
| Format | ATSU$(vin),$(ain)_ Example: ATSU0,1 _ |
| Parameter | 1. Video input selection VIN: 0 let the system detect; 1 force CVBS input; 2 force hdmi/SDI input 2. Audio input selection AIN: 0 let the system detect; 1 force analog input |
| Use | Used to meet specific application requirements (Example: HDMI/SDI input video, MIC input audio) |
| Return Value | Example: ATSU0,1_ ATSU0,1 OK |
| Remark | setting command, power-off save. |
Get User Command
| Format | ATGU _ Example: ATGU_ |
| Parameter | No |
| Use | To query user-specific configuration |
| Return Value | Example: ATGU_ ATGU0,1 OK |
| Remark | query command return parameter description please refer to the ATSU command |
Set Receiver Command
| Format | ATSR $(freq), $(bw ), $(llc), $(cvbs)_ Example: ATSR320000,6000,0,0_ |
| Parameter | 1. DR2C carrier frequency freq(KHz) 200000~860000(200MHz~860MHz, 1KHz step) 2. DR900 carrier center frequency freq(KHz) 200000~1600000(200MHz~1.6GHz, 1KHz step) 3. DR2C channel bandwidth bw(KHz) 2000~8000(2MHz~8MHz, 1KHz step) 4. DR900 channel bandwidth bw(KHz) 3200~8000(3.2MHz~8MHz, 1KHz step) 5. Enhanced data reliability option llc: 0 disable; 1 enable (it is required that the transmitter should also enable this option at the same time, and use it in pairs. Since more redundant data is added to enhance reliability, the video bit rate of the transmitter should be set to when this option is turned off half of) 6. AV output system cvbs: 0 pal; 1 ntsc |
| Use | To set the receiver parameter |
| Return Value | example: ATSR320000,6000,0,0_ ATSR320000,6000,0,0 OK |
| Remark | setting command, save when power is off. |
Get Receiver Command
| Format | ATGR_ |
| Parameter | No |
| ATGR_ | the receiving end parameter |
| Return Value | Example: ATGR_ ATGR320000,6000,0,aes:0,cvbs:0 OK |
| Remark | 1. Query command 2. Aes parameter indicates the current encryption status: 0 disable;1 enable 3. CVBS parameter Indicates the current AV output standard: 0 pal;1 ntsc |
Get Bit Error Rate Command
| Format | ATGB_ |
| Parameter | No |
| Use | querying the bit error rate and signal strength of the dual antennas at the receiving end |
| Return Value | Example: ATGB_ ATGB ber1:0.00% ber2:0.00% RSSI1 :54 RSSI2:53 Lock1:1 Lock2:1 OK |
| Remarks | 1. Query commands 2. Ber1 and ber2 respectively indicate the bit error rate of each antenna, ranging from 0.0% to 100.0% 3. RSSI1 and RSSI2 respectively indicate the signal strength of each antenna, ranging from 0 to 100 4. Lock1 and Lock2 respectively indicate the signal locking status of each antenna (1 Represents signal lock) |
Set Password Command
| Format | ATSP$(password), $(password)_ Example: ATSP123456, 123456_ |
| Parameter | AES key password: 6-digit password (ASCII) AES key password: 6-digit password (ASCII) (repeat it for confirmation) |
| Use | Used to set the AES key of the transceiver (transmitter and receiver) |
| Return Value | Example: ATSP123456_ ATSP123456 OK |
| Remark | 1. When the password is all 0, AES encryption is turned off. 2. Set the command and save it after powering it off. |
Set Data Transfer Command
| Format | ATST$(baud rate), $( parity)_ Example: ATST115200,0_ |
| Parameter | 1. Baud rate baud rate: 1200、2400、4800、9600、19200、38400、57600、115200 2. Check Code: 0: None; 1: Odd; 2: Even |
| Use | Used to set the baud rate and parity bit of the serial port for data transparent transmission |
| Return Value | Example: ATST115200,0_ ATST115200,0 OK |
| Remarks | Set command |
Get Data Transfer Command
| Format | ATGT_ |
| Parameter | No |
| Use | Used to query the baud rate and check code |
| Return Value | Example: ATGT_ ATGT115200,0 OK |
| Remarks | Query command |
Set IP Address Command
| Format | ATSIP$(ip), $(ip)_ Example: ATSIP192.168.1.215,192.168.1.215_ |
| Parameters | Local IP address Local IP address (repeat to confirm) |
| Use | Used to set the receiver IP address |
| Return Value | Example: ATSIP_192.168.1 .215,192.168.1.215_ ATSIP192.168.1.215 OK |
| Remarks | 1. After setting the IP address, the receiving end needs to be restarted to take effect. 2. Set the command and save it after powering it off. |
Get IP Address Command
| Format | ATGIP_ Example: ATGIP_ |
| Parameter | No |
| Use | to query the current IP address of the receiving end |
| Return value | Example: ATGIP_ ATGIP192.168.0.215 OK |
| Remark | query command |
OSD Overlay Protocol
| Format | ATOSD$(idx), $(x), $(y), $(str)_ Example:ATOSD0,40,20,height: 100m_ |
| Parameter | 1. IDX index: 0~7 (supports OSD overlay for 8 areas) 2. X-coordinate: 0~1919 3. Y coordinate: 0~1079 4. str: the string to be displayed at the corresponding coordinates (the space symbol is used to clear the display) |
| Use | on the video screen.OSD information |
| Return value | No |
| Remarks | 1. The user specifies the x and y coordinates of the OSD display according to the maximum 1920×1080 pixels, and the system will correct the coordinates according to the actual display situation. 2. The ‘_’ character cannot be contained in the str parameter |
Set Gain To Adjust
| Format | ATSAD$(freq),$(adjust) _ Example:ATSAD700000,2.5_ |
| Parameter | wireless central working frequency： Freq(KHz) 200000~2700000(200MHz~2.7GHz, step: 1KHz) Adjust the value(dB): ATSD cmd will subtract this value to set the wireless gain |
| Function | Specify and adjust the value for the wireless gain setting using by ATSD cmd |
| Feedback | Example: ATSAD700000,2.5_ freq:700000,adjust:2.50 OK |
| Comments | Setting command is still valid when stopping power or resetting. |
Get Gain To Adjust
| Format | ATGAD[$(freq)]_ Example:ATGAD700000_ |
| Parameter | wireless central working frequency： Freq(KHz) 200000~2700000(200MHz~2.7GHz, step: 1KHz) When no parameter provides, it will list all the freq that have adjusted value. |
| Function | Inquiry adjust the value for wireless gain setting using ATSD cmd |
| Feedback | Example: ATGAD700000_ freq:700000,adjust:2.50 OK ATGAD_ freq:700000 750000 OK |
| Comments | Inquiry command. |
Serial Port Utility software download
https://www.alithon.com/downloads
FAQ
1. How can I return to the No Password setting with 000000 indications after the change?
Reset the password to 000000 (one must not be missing) through the Parameter Configuration Panel Board.
or set it through the ATSP_command
2. I see that Gain is the output power of the transmitter. Please tell me the range of settings of this parameter. All setting level (Gain) good for linear output operation? Or do you suggest some limited range for better linear operation?
The Gain of the COFDM configuration is the internal Gain, not the actual output power of the transmitter. The internal gain range is 0~89.75dB and the linear output:
1. At around 300~500MHz, the Gain is set to 89.75, and the actual output power of the transmitter module is about -5dBm.
2. At around 1000~1500MHz, the Gain is set to 89.75, and the actual output power of the transmitter module is about -6dBm to -10dBm.
3. I tried to set – B bandwidth (kHz) and E bit rate (Mbps). When I set E, the new value does not apply. So. the E setting is only for monitoring of available bitrate? if I wish to change the E (Bitrate) I have to change only B (bandwidth)? Am I right?
It is not recommended to modify the video bit rate ‘E’ directly, because if the output video bit rate is greater than the wireless air interface rate, the system will not work normally.
By default, the internal video bit rate ‘E’ will be set to 0 for automatic. Customers only need to modify ‘B’ to modify the wireless parameters, and the video bit rate will automatically adapt.
You can also adjust the wireless air interface rate by modifying GI and CR.
For more details on the Encoder Modulator Decoder Demodulator Module, please send an inquiry to us.
COFDM Modulator Demodulator Module Encoder Decoder HDMI CVBS AV Input AES 256 FHD RF streaming
COFDM Modulator Demodulator Module Encoder Decoder HDMI CVBS AV Input AES 256 FHD RF streaming
Table of Contents
COFDM Encoder module, CVBS / HDMI input, IP output
For More details about the COFDM encoder board, please visit here
COFDM Encoder module Advantage:
- Ultra-low latency H.265/H.264 audio and video encoding maximum support 1080P@60 real-time video capture and encoding
- HDMI or AV audio and video input, after encoding, the Ethernet port output or Output to wireless module, video encoding bit rate can be dynamically configured
- Support audio input and audio decoding output
- Support two videos (HDMI+AV) simultaneous input encoding (option, the default is HDMI or AV encoding, pick one from two input sourcing). )
- Web UI or serial port UART AT command for configuration management
COFDM transmitter module
Free Inquiry, Free Quote, Free Support!
COFDM modulator-demodulator datasheet download
COFDM demodulator Vcan1776RX-H264 datasheet
FAQs
- Question1: Could you please tell me part number of this component, we try to find localy and check. Answer 1: It is a inductance named LOH32PN2R2NNC.
- Suggest Check Points: If the power supply current of the board is well but there is no RF output, maybe the below component TC1-1-13MX+ is generally damaged.
- In order to avoid damage to this device during transportation (the device itself is relatively high), we ordered red glue protection for this device when we shipped it.
- The engineer also suggests that you check to see if the cable is loose or in poor contact.
- Please try to replace the FPC cable connecting the two boards
- We can provide spare parts if you're sure which one.
Sure
Please check the below link.
Encoder Modulator Decoder Demodulator Module Parameter Configuration Instructions COFDM AT Command
3. Question, If our camera quality is good enough for both 4 MHz and 8 MHz bandwidth. In this case, Should the customer choose 4 MHz or 8 MHz?
Answer: Our one-way COFDM shipments use 4Mz wireless bandwidth by default, corresponding to a video bit rate of 3.12Mbps, which is enough for 1080p; If changed to 8MHz wireless bandwidth under the same conditions, the video bit rate doubles to 6.24Mbps. All customers can choose between wireless bandwidth 4MHz and 8MHz, even 6MHz can also be considered.
4. Question: Which is better for this tx+rx set from a receive sensitivity view?
Answer: For wireless links, it can be simply considered that the receiving sensitivity will be higher at lower wireless bandwidths. From the perspective of receiving sensitivity, 4MHz>6MHz>8MHz
Sure
Please check the below link
COFDM Relay Repeater module for drone UAV wireless video transmitter and receiver Vcan1870
Single channel receiving sensitivity:
-97+/-1dbm at QPSK 8MHz,
-98+/-1dbm at QPSK 6MHZ,
Sensitivity increased by 3dbm when receiving with dual antennas
The receiver default firmware supports RTSP player, some clients prefer UDP player, which we also can offer, then RTSP player doesn't support. （RTSP and UDP can only choose one of the two firmware）
Please download at the below link.
Splayer_v4.2_2020.6.6
https://drive.google.com/file/d/1ihzUhfnx2Wo3zLO8UAs1aUQeLswonJD-/view?usp=sharing
Splayer_v4.3_2022.10.22
https://drive.google.com/file/d/1PQc-LZ55qGnjeMsjkHYSloHfY3NEUsGH/view?usp=drive_link
Sure, please check the below picture.
How to switch HDMI or CVBS video input via the UART AT command?
How to upgrade the COFDM video receiver
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