User manual for the Juying DAM1012A-GPRS relay control card, covering features, specifications, wiring, SMS configuration and cloud platform operation.
The DAM1012A‑GPRS is a GPRS‑enabled relay control card from Juying Electronics. It provides ten relay outputs and twelve analog inputs, and communicates via GSM networks (China Mobile, China Unicom) using standard Modbus protocol.
The manual describes hardware connections, device ID acquisition, SMS command configuration, cloud platform software, and detailed Modbus command formats for monitoring and controlling relays and analog channels. This manual is written in Chinese.
| Supply voltage | DC7‑40V |
|---|---|
| Relay contact capacity | 10A/30VDC, 10A/250VAC |
| Durability (relay cycles) | 100,000 cycles |
| Communication interface | GSM network (Mobile, Unicom) – GPRS |
| Temperature range | -40 °C to 85 °C (industrial grade) |
| Physical dimensions | 145 mm × 94 mm × 41 mm |
| Weight | 330 g |
| Baud rates | 2400, 4800, 9600, 19200, 38400 |
| Relay outputs | 10 channels |
| Analog inputs | 12 channels (0‑20 mA/4‑20 mA/0‑5 V/0‑10 V) |
It uses the GSM network (China Mobile and China Unicom) for GPRS communication.
The device supports 2400, 4800, 9600, 19200 and 38400 baud.
The card provides ten relay output channels.