User Manual E28-2G4T27SX
E28-2G4T27SX User Manual Contents Contents ····················································································································································································································································1 1.Product Overview.................................................................................................................................................................................. 2 1.
. E28-2G4T27SX User Manual 1.Product Overview 1.1 Brief Introduction E28-2G4T27SX is an UART module based on SEMTECH SX1281, it adopts transparent transmission and works at 2.4GHz band. It adopts FSK modulations. It features SMD packing compatible with 3.3V and 5V IO port voltage. 1.
. E28-2G4T27SX User Manual Min Max Voltage supply [V] 2.3 5.5 Blocking power [dBm] - Operating temperature [℃] -40 Voltage over 5.5V will cause permanent damage to module Chances of burn is slim when modules are used in 10 short distance +85 - 2.2 Operating parameter Performance Main parameter Note Min Typ Max 2.3 5.0 5.5 - 3.
. E28-2G4T27SX User Manual 3. Mechanical Characteristics 3.1.
E28-2G4T27SX User Manual 3.2. Pin Definition Pin No.
. E28-2G4T27SX User Manual 4. Recommended Connection Diagram No. Brief description for module-MCU connection (STM8L MCU as example) 1 The wireless UART module adopts TTL level, please connect to MCU with TTL level. 2 For some 5V MCU, 4~10K pull-up resistor may need to be added at the TXD and AUX pins of the module. 5. Functional Description 5.1. Broadcast Address i.e.: set the address of module A as 0xFFFF or 0x0000 and channel as 0x04.
. E28-2G4T27SX User Manual 5.4. AUX Description AUX Pin can be used as indication for wireless send & receive buffer and self-check. It can indicate whether there is data that is yet to send via wireless or whether all wireless data has been sent through UART, or whether the module is still in the process of self-check initialization. 5.6.1 Indication of serial output Used to wake up the external MCU (note: AUX indicates no delay under continuous mode) 5.6.
. E28-2G4T27SX User Manual 1 - RSSI Mode 1 0 1 Serial port on, RF on, RSSI on 2 – Ranging Mode 1 1 0 Reserved 1 1 1 0 x x 3 - Configuration Mode 4 – Power Level Serial port on ， RF off, parameter configuration Power Level setting: channel 17 The module outputs RSSI value through serial port every 100ms - Baud rate is fixed as 9600 8N1 - 6. Operation Modes The module has 4 operation modes, which are determined accordingly by pins M0, M1. Please refer to below instructions: 6.1.
. 6.5.
. E28-2G4T27SX User Manual 7. Command Format Under configuration mode (Mode 3:M0=1, M1=1, M2 =1), the supported parameters are as below (Only support 9600 and 8N1 format when setting) Command No. C0 + working 1 parameters 2 C1+C1+C1 C2 + working 3 7.1. Description Format parameters 4 C3+C3+C3 5 C4+C4+C4 6 E2+E2+E2 7 E3+E3+E3 C0 + 5 bytes working parameters are sent in hexadecimal format. 6 bytes in total and must be sent in succession.
. 7.4. E28-2G4T27SX User Manual Reset Command Command Format Description Under configuration mode (M0=0, M1=1, M2 =0), send command (HEX format) to the serial: C4 C4 C4, the module will conduct a reset; During reset, the module will conduct self-check, AUX outputs low level, when reset is completed, AUX outputs high level, the module starts to work normally. Now, user could switch mode or send another command. C4+C4+C4 7.5. Parameter Configuration Commands No.
. 4 CHAN E28-2G4T27SX User Manual Communication Channel Normal mode: when air data rate is 100k, the formula to calculate channel is: 2402 + CHAN * 2MHz Continuous transmission mode: When baud rate is 1200, 9600 or Default: 0x18 9200, the formula to calculate channel is: 2402 + CHAN *2MHz； when baud rate is 4800, 57600, 115200, the formula to calculate channel is: 2402 + CHAN *4MHz; when baud rate is 460800, 921600, the formula to calculate channel is: 2402 + CHAN *5MHz.
E28-2G4T27SX User Manual 8. Hardware design It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible, and the module needs to be reliably grounded.； Please pay attention to the correct connection of the positive and negative poles of the power supply.
E28-2G4T27SX User Manual 9. FAQ 9.1 Communication range is too short The communication distance will be affected when obstacle exists. Data lose rate will be affected by temperature, humidity and co-channel interference. The ground will absorb and reflect wireless radio wave, so the performance will be poor when testing near ground. Sea water has great ability in absorbing wireless radio wave, so performance will be poor when testing near the sea.
E28-2G4T27SX User Manual 10. Production Guidance 10.1 Reflow soldering temperature Profile Feature Curve characteristics Sn-Pb Assembly Pb-Free Assembly Solder Paste Sn63/Pb37 Sn96.5/Ag3/Cu0.5 Preheat Temperature min （Tsmin） Min preheating temp. 100℃ 150℃ Preheat temperature max (Tsmax) Max preheating temp.
E28-2G4T27SX User Manual 11. Package for batch order Revision history . Version Date Description Operator 1.
. E28-2G4T27SX User Manual FCC Statement 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.
. 9. E28-2G4T27SX User Manual The modular transmitter has been fully tested by the module grantee on the required number of channels,modulation types, and modes, it should not be necessary for the host installer to re-test all the available transmitter modes or settings.
