RF module-LoRa/Audio/2.4G/Bluetooth/ Wireless Transceiver Module-Antenna-NiceRF
User Guide for G-NiceRF models including: 2AD66-DMR818S-U, 2AD66DMR818SU, dmr818s u, DMR818S-U Digital Walkie Talkie Module, DMR818S-U, DMR818S-U Walkie Talkie Module, Digital Walkie Talkie Module, Walkie Talkie Module, Module
NiceRF Wireless Technology LTD. DMR818S-U Digital walkie talkie module 2AD66-DMR818S-U 2AD66DMR818SU dmr818s u
File Info : application/pdf, 14 Pages, 1.38MB
DocumentDocumentuser guide -1- www.nicerf.com Note: Revision History Revision V1.0 V1.1 Date 2022-4 2022-9 Comment First release Update Block Diagram www.nicerf.com 1. Descriptions DMR818S-U is a 1W long distance DMR walkie talkie module, it comes with built-in high performance microcontroller, digital mobile radio IC and RF power amplifier. All parameters(CTCSS, CDCSS, SQ, Predefined channels etc.) can be easily modified with protocol. With external power supply, speaker, and audio amplifier, it is easy to become a professional digital walkie talkie. Simplified interface and Ultra small size make this module widely used in various applications and conveniently embedded into various handheld device. DMR mode: Message transmission and reception. Enhanced encryption of Voice and Text message. Various voice call types: All call, Group call and Private call; Reminder for input calling, calling status checking Emergency alarm and radio monitor; Repeater Analog mode: CTCSS/CDCSS configurable Squelch levels configurable 2. Features UHF band frequency: 400~470 MHz Distance up to 5Km High Sensitivity: -124dBm Bit error rate down to 1% under -121dBm Independent frequency for Tx and Rx. 9 adjustable volume Message transmission and reception DMR(Digital Mobile Radio)/ Analog walkie talkie Built-in EEPROM, data saved even powered off 1ppm TCXO crystal 51 CTCSS 166 CDCSS 3. Application DMR walkie talkie module Invisible intercom system Building security system Audio surveillance system www.nicerf.com 4. Electrical Characteristics Parameters Voltage range Operating Temperature Frequency range Test condition @UHF Min. 3.34 -20 400 Typ. Max 4.2 5.0 25 80 470 Start time Uart baud rate Sleep current Rx current Tx current high power Tx current low power Tolerance of frequency Modulation sensitivity Current Consumption CS pulled low for 3 seconds @VCC=4.2V, 1w analog @VCC=4.2V, 1w digital @VCC=4.2V, 0.5w analog @VCC=4.2V, 0.5w digital RF Parameters 1.5KHz/2.5KHz frequency offset 6 2000 57600 < 55 <135 <1300 <1000 <650 <500 1 1.5 7 12 Unit V MHz ms bps uA mA mA mA mA mA ppm mv www.nicerf.com Adjacent-channel power @12.5K offset -60 -62 Mic input voltage 0.1 1.6 CTCSS modulation frequency offset 0.35 0.4 0.6 300HZ -13 -11 -9 500HZ -9 -6 -5 Modulation characteristics 1000HZ -3 0 1 2000HZ 3 6 7 3000HZ 5 7 11 Rx Parameters Sensitivity Analog (12db SNR) -120 Receiving BER(DMR modulation) @ -118dBm 5 Audio output amplitude 500 Audio Output impedance 30 Adjacent channel selectivity Offset:+12.5KHz Offset:+12.5KHz 60 dBm Vpp KHz dB dB dB dB dB dBm % mV KOhm dB www.nicerf.com 5. Functions descriptions: 1) Voice transmission "PTT" pin is used to control the voice transmission. Pull low to enable voice transmission; High to end transmission. Timing operation: 2) Voice receiving After power on, DMR818S-U will enter into receiving mode automatically. It will return back to receiving mode after voice transmission ended. For details of receiving process, please check "DMR818S-U communication protocol". 3) Sleep function The module can switch work and sleep mode through CS pin. When the CS pin is high, it is the working mode, and when the CS pin is low, it is the sleep mode. In sleep mode, all peripherals of the module are turned off and cannot communicate and respond to serial commands. Note: CS pin is low level by default, in sleep mode, the user needs to give high level externally to make the module work. After the CS pin level changes, the state needs 3 seconds to switch. 4) Switch of Audio amplifier Pin "SPK_EN" is used to control external audio amplifier. When playing voice, SPK_EN in high level, low level when other status. The timing of SPK_EN as blow: www.nicerf.com 6. Brief of Serial Communication Protocol All the parameters of DMR818S-Ucan be configured using Serial Communication Protocol. MSB for the command. Format as below The definition of protocol as below Offset 0 1 2 Flag Head CMD R/W 3 S/R Length Comment Detail 1 Packet header 0x68 1 command 0x01~0x28parameter function refer to table 1 1 Read /write 0x00reading operation 0x01writing (external CPU TX is writingexternal CPU RX is reading) 0x02initiative sending 1 Setting/Respo setting nding 0x01start answering 0x00 Done 0x01 busy or failnote 2 0x02 No channel or channel errors note 3 0x07 module killed 0x09 check error notemessage, voice refer to below corresponding specification 45 67 8 CKSUM 2 LEN 2 DATA len TAIL 1 Note 1CMD as below Checksum Data length Data info Tail of packet Checksum for all the packet DATA lengthno information LEN is 0 0x10 CMD Function www.nicerf.com Message available for All Message save when channels or current Power off (yes / no) channel 0x01 Channel change yes 0x02 Receive volume All yes 0x03 scanning current channel no 0x04 Transceiver status checking current channel no 0x05 Signal strength value current channel no 0x06 Various call modesCall Type current channel no 0x07 Message mode setting and transmit current channel no 0x09 Emergency alarm current channel no 0x0a Enhancements current channel no 0x0b Mic Gain configuration All yes 0x0c Power-saving mode configuration All yes 0x0d Transceiver frequency current channel yes 0x0e Repeater/off-web current channel no 0x10 Receive/call type, number output current channel no 0x11 Read received data current channel no 0x12 SQ setting current channel yes 0x13 Mode of CTCSS/CDCSS current channel yes 0x14 CTCSS/CDCSS current channel yes 0x15 Monitor switch current channel no 0x16 Bit Error rates no 0x17 High/low power current channel yes 0x18 Contact person current channel no 0x19 Encryption switch current channel no 0x1a Completed initialization no DMR818S-U www.nicerf.com 0x22 Transmit contacts information current channel no 0x23 Testing message current channel no 0x24 ID reading all no 0x25 Firmware Version reading all no 0x28 Checking encryption status current channel no 0x29 Set up a contact to receive group current channel yes calls 0x30 Delete group call contact current channel yes 0x1B Set the phone number current channel yes 0x31 Set native color code current channel yes 0x32 Set analog bandwidth current channel yes 0x33 Set time slot current channel yes 0xF0 Restore default parameters all yes 0xF2 Software reset all no Note 2: When DMR818S-U is transmitting, receiving, and configuring, it will show 0x01 to tell setting fail for busy. Note 3: It show 0x02 for below condition: 3.1: When change to non-exist channel; 3.2: It all happen when configure DMR settings in analogy channel( such as: message, special functions) , 3.3 : Configure analog parameters in DMR channel. 7. Pin Assignment www.nicerf.com Pin NO. Pin name I/O 1 MIC_IN I 2 UART-TX O 3 UART-RX I 4, 12 NC 5 HST_TXD O 6 HST_RXD I 7 ANT 8, 9, 10 GND - 11 VCC - 13 CS I 14 PTT I 15 +3.3V - 16 LINE_OUT O 17 T/R O 18 SPKEN O 19, 20 GND - Level standard Description 0-3.3V 0-3.3V Microphone or line in Transmit receive 0-3.3V 0-3.3V 0-5V 0-5V 0-3.3V 0-3.3V 0-3.3V Transmit data pin (for upgrading program) Receive data pin (for upgrading program) connect 50 ohm antenna Ground External and Positive supply 3.3~5V High level for normal working, leave open or pull low to enter sleeping mode Module Input, Transmitting/receiving control, pull low to force the module to enter TX state; pull high for Rx state 3.3V outputconnect to 50mA Audio output Module Output, status of Transmitting/receiving, High for TX and low for Rx Audio amplifier control Ground www.nicerf.com 8. Accessories 1) Antenna The antenna is very important for RF communication,Its performance will affect the communication, the module requires the antenna with 50 impedance. Universal antennas are Rod antenna, sucker antenna and telescopic antenna, User can choose the right antenna according to their application. We advise to use antennas listed on our website to get better performance. 9 . Mechanism Dimension(Unit:mm) AppendixSMD Reflow Chart www.nicerf.com We recommend you should obey the IPC related standards in setting the reflow profile: FCC WARNING: Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: --Reorient or relocate the receiving antenna. --Increase the separation between the equipment and receiver. --Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. --Consult the dealer or an experienced radio/TV technician for help. This equipment complies with FCC radiation exposure limits set forth for an controlled environment. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter. This equipment should be installed and operated with minimum distance 20cm between the radiator& your body. 2.2 List of applicable FCC rules CFR 47 FCC PART 90 has been investigated. It is applicable to the modular. 2.3 Specific operational use conditions This module is stand-alone modular. If the end product will involve the Multiple simultaneously transmitting condition or different operational conditions for a stand-alone modular transmitter in a host, host manufacturer have to consult with module manufacturer for the installation method in end system. 2.4 Limited module procedures Not applicable 2.5 Trace antenna designs Not applicable 2.6 RF exposure considerations To maintain compliance with FCC's RF Exposure guidelines, this equipment should be installed and operated with minimum distance of 20cm from your body and the maximum antenna gain should not exceed 2.5dBi. For modules used in host that not compliance with the requirement, such as less distance or greater antenna gain or in portable device or with other transmitters simultaneously, requires additional evaluation, testing, or testing and Class 2 permissive change. 2.7 Antennas This radio transmitter FCC ID: 2AD66-DMR818S-U has been approved by Federal Communications Commission to operate with the antenna types listed below, with the maximum permissible gain indicated. Antenna types not included in this list that have a gain greater than the maximum gain indicated for any type listed are strictly prohibited for use with this device. Antenna Frequency No. Antenna Gain Impedance Type Range external 1 antenna 2.5dBi 50 400-470MHz 2.8 Label and compliance information The final end product must be labeled in a visible area with the following" Contains FCC ID: 2AD66-DMR818S-U" 2.9 Information on test modes and additional testing requirements Host manufacturer is strongly recommended to confirm compliance with FCC requirements for the transmitter when the module is installed in the host. 2.10 Additional testing, Part 15 Subpart B disclaimer Host manufacturer is responsible for compliance of the host system with module installed with all other applicable requirements for the system such as Part 15 B