User manual for the Zhiyuan Electronics ZWG-13A industrial‑grade external GPRS modem, covering installation, configuration, and phone/SMS functions.
The ZWG‑13A is an industrial‑grade external GPRS modem designed for wireless Internet access, SMS messaging, and voice calls in automation and control applications. This manual provides step‑by‑step instructions for hardware installation, power and antenna setup, and serial‑port connection.
It also details the configuration of dial‑up Internet functions, phone operations, and SMS commands, including AT‑command syntax for sending and receiving text messages in both English and Chinese. Safety notices and warranty information are included at the end of the document. This manual is written in Chinese.
| Network type | GPRS (CLASS B) |
|---|---|
| Theoretical transmission rate | 171.2 Kbps |
| Antenna interface | 50 Ω SMA (female) |
| Serial port level | RS232 standard levels |
| Serial port connector | DB9 female, 9‑pin |
| Supported baud rates | 300 – 115200 bps |
| Power supply range | DC +5 V – +35 V |
| Maximum working current | 450 mA |
| Idle current | 25 mA |
| Operating temperature | -25 °C – +70 °C |
The modem supports standard baud rates from 300 bps up to 115200 bps.
The modem uses a 50 Ω SMA female connector for the antenna.