1. Киришүү
The PUSR USR-DR502-E is a cost-effective DIN-Rail 4G LTE Cat 1 Cellular Modem designed for industrial IoT applications. It supports various communication protocols and features for reliable data transmission. This modem is part of the DR Series, which includes Serial to Ethernet converters, 4G LTE Cat 1 modems, and 4G industrial routers, all featuring a built-in 35 mm DIN rail seat for versatile installation.
Figure 1: PUSR USR-DR502-E DIN-Rail 4G LTE Cat 1 Cellular Modem
Видео 1: Бүттүview of the USR-DR502-E DIN-Rail LTE Cat 1 Modem, highlighting its small size, rail mounting, and rich protocol support.
2. Орнотуу жана орнотуу
2.1 Пакеттин мазмуну
- USR-DR502-E Cellular Modem
- Антенна
- Терминалдык туташтыргычтар
- (Башка аксессуарлар пакетке жараша өзгөрүшү мүмкүн)
2.2 Физикалык орнотуу
The USR-DR502-E is designed for DIN-Rail mounting, offering convenient cabling and space-saving installation in low voltage distribution boxes. Its PC+ABS materials ensure a compact, low-cost, and flame-retardant (V0 grade) design, ensuring safe use.
Figure 2: DIN-Rail mounting for convenient installation and space saving.
- Attach the modem to a standard 35mm DIN rail.
- Connect the antenna to the SMA Female connector on the modem.
- Insert a 1.8V/3V SIM/USIM card into the designated slot.
- Connect the RS485 serial device to the RS485 terminal.
- Connect the power supply (9V-36V DC) to the power terminals.
3-сүрөт: Каптал view of the modem showing SIM card slot and USB port.
4-сүрөт: Жогорку view of the modem with power and RS485 terminals.
3. Операция
3.1 Тармак режимдери
The modem supports various network modes for flexible data communication:
- Transparent Transmission Mode: Delivers bi-directional transparent transmission of data between devices and networks. Supports four socket connections, TCP client, and User Datagram Protocol (UDP). Includes customized heartbeat and registration package functions.
- HTTPD Mode: Supports submission of serial data to a designated server in HTTP (GET/POST) mode.
- MQTT режими: Widely supports connection to IoT platforms using the standard MQTT protocol (e.g., AWS, Tuya, Alibaba Cloud, ThingsBoard, EMQ, Cumulocity IoT). This function requires firmware version V1.3.21 or above.
Figure 5: Diagram illustrating Transparent Transmission Mode and HTTPD Mode.
Figure 6: The modem supports MQTT for integration with platforms like AWS, Tuya, Alibaba Cloud, ThingsBoard, EMQ, and Cumulocity IoT.
3.2 Маалыматтарды берүү
The USR-DR502-E facilitates bi-directional data transmission between RS485 serial devices and 4G LTE Cat 1 networks.
Figure 7: Basic function diagram showing data flow between RS485 and 4G network.
3.3 Конфигурация
Parameters can be configured via serial, network, and SMS AT commands. A dedicated PC configuration tool is available for ease of use.
Figure 8: Screenshot of the PC configuration tool for the USR-DR502-E.
For detailed instructions on using the configuration tool and AT commands, please refer to the official product page.
4. Техникалык тейлөө
4.1 Firmware Over-The-Air (FOTA) Remote Upgrade
The modem supports automatic firmware upgrades through a remote management platform. This feature optimizes upgrade packages, saving traffic and time.
Figure 9: FOTA remote upgrade process via the management platform.
4.2 Hardware Protection
The USR-DR502-E is built with robust hardware protection features to ensure reliability and longevity:
- Level-3 ESD protection
- Level-3 surge protection
- Built-in hardware watchdog
Figure 10: Visual representation of hardware protection features.
5. Кыйынчылыктарды
This section provides general guidance for common issues. For specific problems, refer to the detailed product documentation or contact support.
5.1 Жалпы маселелер
- Тармак туташуусу жок:
- SIM карта туура салынганын жана иштетилгенин текшериңиз.
- Антенна байланышын текшериңиз.
- Verify network coverage in the area.
- Confirm APN settings are correct in the modem configuration.
- Маалыматтарды өткөрүү катасы:
- Check serial port settings (baud rate, data bits, parity, stop bits).
- Verify server IP address and port settings.
- Ensure the modem is in the correct operating mode (Transparent, HTTPD, MQTT).
- Check firewall settings on the server side.
- Түзмөк күйбөй жатат:
- Электр энергиясы менен камсыздоону текшерүү томtage 9V-36V диапазонунда.
- Электр кабелинин байланыштарын текшериңиз.
5.2 Аппаратты баштапкы абалга келтирүү
The modem features a 'Reload' button for resetting. Consult the full manual for specific reset procedures and their effects on configuration.
6. Техникалык шарттар
Below are the key specifications for the USR-DR502-E model:
| Категория | Параметр | USR-DR502-E |
|---|---|---|
| LTE категориясы | LTE Cat.1 | LTE Cat.1 |
| GSM / GPRS / EDGE | 900/1800 МГц | |
| Жыштык тилкелери | LTE FDD | B1/B3/B7/B8/B20/B28 |
| GSM / GPRS / EDGE | 900/1800 МГц | |
| Берүү ылдамдыгы | LTE FDD Rel.13 | 10Mbps DL / 5Mbps UL |
| GPRS | 85.6Kbps DL / 85.6Kbps UL | |
| TX Power | FDD: B1/3/7/8/20/28 | 23дБм ± 2дБ |
| GSM: 900MHz | 33дБм ± 2дБ | |
| GSM: 1800MHz | 30дБм ± 2дБ | |
| Rx сезгичтиги | GSM: 900MHz | -109.5дБм |
| GSM: 1800MHz | -108дБм | |
| FDD: B1/3/20 | -98дБм | |
| FDD: B7 | -97.5дБм | |
| FDD: B8/B28 | -98.5дБм | |
| Serial Parameters | ЖОК. | RS485 (Terminal) * 1 |
| Маалымат биттери | 8 | |
| Токтотуу биттери | 1, 2 | |
| Паритет биттери | ЖОК, КАДЫР, ЖҮП | |
| Bod Rate | 1200 ~ 230400 | |
| Физикалык интерфейстер | SIM/USIM card | 1.8V/3V (with slot) |
| Антенна | SMA аял | |
| USB | USB 2.0 | |
| Көрсөткүчтөр | POWER, WORK, NET, LINK, RSSI | |
| Аппараттык камсыздоонун мүнөздөмөлөрү | Киргизүү көлөмүtage | 9V ~ 36V |
| Туташтыргыч | Терминал | |
| Турак жай материалы | ABS пластик | |
| Өлчөмдөрү (мм) | 44.5 × 31.8 × 13.94 (L*W*H) | |
| Иштөө температурасы | -30℃ ~ +75℃ | |
| Сактоо температурасы | -40℃ ~ +85℃ | |
| Иштеп жаткан нымдуулук | 5% ~ 95% | |
| Сактоочу нымдуулук | 5% ~ 95% | |
| Программалык камсыздоо | Протокол | TCP/UDP/IPV4/IPV6/DNS/HTTP/MQTT |
| RNDIS | Default Close | |
| Serial to network | 4 sockets, default A | |
| SMS | PDU/TEXT | |
| Буйрук режими | 6 Розетка | |
| Конфигурация | Serial, Net, SMS AT commands | |
| Кэш | 20 пакет | |
| Таңгактоо механизми | Packaging time (ms) | 10 ~ 500, default 50 |
| Packaging length (byte) | 5 ~ 65535, default 1024 | |
| Башкалар | Курал | USR-Cat1 Configuration Utility |
| Сертификаттар | CE, ROSH |
Note: Specifications are subject to change without prior notice. Always refer to the latest official documentation.
7. Колдонуучунун кеңештери
- Remote Deployment: Given its small size and DIN-Rail mounting, this modem is ideal for data collection in remote distribution boxes. Its robust design (PC+ABS materials, flame retardant V0) ensures safe operation in various environments.
- Сыртта колдонуу: The modem's ability to operate in a wide temperature range (-30℃ to +75℃) and its support for mainstream LTE frequency bands make it suitable for outdoor or remote applications where reliable cellular connectivity is needed.
8. Кепилдик жана колдоо
The USR-DR502-E modem is certified with CE and RoHS, ensuring compliance with relevant safety and environmental standards.
For further technical support, detailed documentation, software downloads, or warranty information, please visit the official PUSR webсайт:
https://www.pusr.com/products/4G-Cat-1-Modem.html
Figure 11: PUSR's commitment to technology standards and certifications (ISO, CE, RoHS).
