ITEM NAME:1Pcs Sim900A Sim900 Mini V4.0 Wireless Data Transmission Module Gsm Gprs Bo N2Y9 1Pcs Sim900A Sim900 Mini V4.0 Wireless Data Transmission Module Gsm Gprs Bo N2Y9 The onboard two set power supply interface VCC5 5 V power supply, VCC4 interface, 3.5-4.5 V power supply, optional power on self start (default) and control start.The onboard SMA (standard) and IPXmini antenna interface, SIM900A interface reserved reset.The size of the module is 49 * 50. The computer can give early computer debugging USB module power, a very large amount of data under the.VCC_MCU when the SIM900A module and 5 V TTL level communication, this pin is connected to DC 5 V; When the level of communication of SIM900A and 3.3 V TTL, this pin is connected to DC 3.3 V. SIMR SIM900A RXD, TTL level, cannot be connected directly to the 232 level.
