USR-GPRS232-7S3 Hardware Manual h.usriot.com
Jinan USR IOT Technology Limited / 11 www.usriot.com
Contents
1. Hardware Introduction..................................................................................................................................................... 3
1.1. Pin Defination........................................................................................................................................................ 3
1.2. Dimensions.............................................................................................................................................................4
1.3. Evaluation Kit.........................................................................................................................................................5
2. Hardware Reference Design.......................................................................................................................................... 6
2.1. Power Interface..................................................................................................................................................... 6
2.1.1. DC5-18V......................................................................................................................................................6
2.1.2. DC 3.6~4.4V...............................................................................................................................................7
2.2. UART Interface......................................................................................................................................................7
2.3. Turn On/Off.............................................................................................................................................................8
2.4. Work/Link Indicator............................................................................................................................................... 9
2.5. Audio Interface.................................................................................................................................................... 10
