Abstract
A low-power remote terminal unit (RTU) based on GPRS/GSM (general packet radio service/global system for mobile communication) hybrid communications was developed for data acquisition and transmission from distributed monitoring points in industrial environments. The RTU samples data at adjustable intervals and uploads the data to the remote monitoring centre. When the GPRS network is congested, the RTU switches to short message service (SMS) mode to resume data transmission with data guaranteed integrity. The RTU uses an MSP430 microprocessor, with its ultra-low power mode utilized during the idle cycle. Lab and field tests demonstrate that the RTU can reliably sample and transmit data. During a 48 h test, the GPRS loss rate was 6.94‰, with no losses with the hybrid communication system. The GPRS average transmission delay was 1.126-2.669 s. The power consumption during the working cycle was 200 mW and 0.2 mW during the low power mode.
| Original language | English |
|---|---|
| Pages (from-to) | 223-225+231 |
| Journal | Qinghua Daxue Xuebao/Journal of Tsinghua University |
| Volume | 49 |
| Issue number | 2 |
| State | Published - Feb 2009 |
| Externally published | Yes |
Keywords
- General packet radio service (GPRS)
- Remote terminal unit (RTU)
- Short message service (SMS)
- Transmission delay