GPRS DTU User Manual V1.3
http://en.usr.cn
Jinan USR IOT Technology Limited
Page 6 of 31
PCB size: 80 * 50mm
2.3.Antenna and SIM Card Installation
The antenna use SMA female base. Revolve the SMA male head to DTU antenna base,
and ensure it is tightened, not to affect the signal quality.
When install or take out SIM card, firstly use a spike to insert the little yellow point on the
right side of SIM base, then SIM cutting ferrule is open. SIM card should be put into cutting
ferrule in first while installing, ensure metal face outside.
2.4.Power Supply
DTU is widely used in complex external environment. To adapt to its application and
improve working stability of system, it use advanced power technologies, users can use
our 5V 1A power adapter directly.
701 power supply ranges DC5~28V
2.5.Indicator Lamps
There are 3 indicators on DTU: “NET”, ”POW”, ”DATA”
