Features: The onboard two set power

Features:
The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5--4.5V power supply, optional power on self starting (default) and control start. The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset. The size of the module is 49*50, all the new and original device. The computer can give early computer debugging USB module power supply, a very large amount of data under the condition of the recommended current more than 1A. Standby dozens of MA data can be set to provide dormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.
The serial port circuit: support for 3.3V single chip microcomputer. TTL serial port support
3.3 and 5V single chip microcomputer.
The SIM card circuit to increase the SMF05C ESD chip.
Antenna circuit: guarantee short and straight, so as to ensure the signal strength.
PCB display screen printing mark: each interface, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual.
Two power supply interface: VCC5, 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5--4.5V power supply, ibid., suitable for lithium battery.
Control pin all leads.
A TTL level, compatible with 3.3V and 5V.
The two antenna interface, the default SMA straight head, connector for IPXmini antenna.
One way of speech interface, the way Mike interface.
The control interface of each pin description:
GND - GND
SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level
SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level
RST - SIM900A reset, active low
VCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V.
VCC5----DC 5V input.
VCC4------DC3.5--4.5 input

Onboard Resources:
Serial port circuit(with protection)
Antenna interface circuit(SMA bend female port)
SIM card circuit(flip SIM slot)
4*3.5 fixture hole 4pcs
SIM900A serial port output terminal

Specifications:
Size:49mm x 47mm
Net Weight:28g
Weight: 38g

Features: 
The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5--4.5V power supply, optional power on self starting (default) and control start. The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset. The size of the module is 49*50, all the new and original device. The computer can give early computer debugging USB module power supply, a very large amount of data under the condition of the recommended current more than 1A. Standby dozens of MA data can be set to provide dormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.
The serial port circuit: support for 3.3V single chip microcomputer. TTL serial port support
3.3 and 5V single chip microcomputer.
The SIM card circuit to increase the SMF05C ESD chip.
Antenna circuit: guarantee short and straight, so as to ensure the signal strength.
PCB display screen printing mark: each interface, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual.
Two power supply interface: VCC5, 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5--4.5V power supply, ibid., suitable for lithium battery.
Control pin all leads.
A TTL level, compatible with 3.3V and 5V.
The two antenna interface, the default SMA straight head, connector for IPXmini antenna.
One way of speech interface, the way Mike interface.
The control interface of each pin description:
GND - GND
SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level
SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level
RST - SIM900A reset, active low
VCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V.
VCC5----DC 5V input.
VCC4------DC3.5--4.5 input

Onboard Resources:
Serial port circuit(with protection)
Antenna interface circuit(SMA bend female port)
SIM card circuit(flip SIM slot)
4*3.5 fixture hole 4pcs
SIM900A serial port output terminal

Specifications:
Size:49mm x 47mm
Net Weight:28g
Weight: 38g

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Features: The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5--4.5V power supply, optional power on self starting (default) and control start. The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset. The size of the module is 49*50, all the new and original device. The computer can give early computer debugging USB module power supply, a very large amount of data under the condition of the recommended current more than 1A. Standby dozens of MA data can be set to provide dormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.The serial port circuit: support for 3.3V single chip microcomputer. TTL serial port support3.3 and 5V single chip microcomputer.The SIM card circuit to increase the SMF05C ESD chip.Antenna circuit: guarantee short and straight, so as to ensure the signal strength.PCB display screen printing mark: each interface, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual.Two power supply interface: VCC5, 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5--4.5V power supply, ibid., suitable for lithium battery.Control pin all leads.A TTL level, compatible with 3.3V and 5V.The two antenna interface, the default SMA straight head, connector for IPXmini antenna.One way of speech interface, the way Mike interface.The control interface of each pin description:GND - GNDSIMR SIM900A RXD, TTL level, can not be directly connected to the 232 levelSIMT SIM900A TXD, TTL level, can not be directly connected to the 232 levelRST - SIM900A reset, active lowVCC_MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V.VCC5----DC 5V input.VCC4------DC3.5--4.5 inputOnboard Resources:Serial port circuit(with protection)Antenna interface circuit(SMA bend female port)SIM card circuit(flip SIM slot)4*3.5 fixture hole 4pcsSIM900A serial port output terminalSpecifications:Size:49mm x 47mmNet Weight:28gWeight: 38g

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Dua set listrik antarmuka supply VCC5 5V power supply yang onboard, antarmuka VCC4, pasokan 3.5--4.5V daya, daya opsional pada diri mulai (default) dan kontrol awal. Onboard SMA (default) dan IPXmini antena antarmuka, SIM900A antarmuka dilindungi ulang. Ukuran modul adalah 49 * 50, semua perangkat baru dan asli. Komputer dapat memberikan debugging komputer modul USB power supply awal, jumlah yang sangat besar data di bawah kondisi saat ini dianjurkan lebih dari 1A. Puluhan siaga data MA dapat diatur untuk memberikan dormansi, dormansi 10mA daya rendah. . Dukungan 2, kartu 3,4G ponsel
Port sirkuit seri: dukungan untuk 3.3V chip tunggal mikro. TTL port serial dukungan
3,3 dan 5V chip tunggal mikro.
Rangkaian kartu SIM untuk meningkatkan chip SMF05C ESD.
Antena sirkuit: menjamin pendek dan lurus, sehingga untuk memastikan kekuatan sinyal.
PCB layar pencetakan tanda: setiap antarmuka, pengembangan nyaman dua kali, SIM900 / A hardware benar-benar mengikuti desain ketika manual desain.
Dua kekuatan antarmuka supply: VCC5, 5V DC atas 1A. Power supply komputer 5V bisa awal USB komputer. DC sirkuit Data panjang lebih 5V1A direkomendasikan lebih besar. VCC4, 3.5--4.5V power supply, ibid., Cocok untuk baterai lithium.
Kontrol pin semua lead.
Tingkat TTL, kompatibel dengan 3.3V dan 5V.
Kedua antena antarmuka, default SMA kepala lurus, konektor untuk IPXmini antena.
Salah satu cara untuk antarmuka pidato, cara Mike antarmuka.
Kontrol antarmuka masing-masing pin description:
GND - GND
SIMR SIM900A RXD, tingkat TTL, tidak dapat langsung terhubung ke 232 tingkat
SIMT SIM900A TXD, tingkat TTL, tidak dapat terhubung langsung ke 232 tingkat
RST - SIM900A ulang, aktif rendah
VCC_MCU ketika modul SIM900A dan 5V komunikasi tingkat TTL, pin ini terhubung ke DC 5V; ketika tingkat komunikasi SIM900A dan 3.3V TTL, pin ini terhubung ke DC 3.3V.
VCC5 ---- DC 5V input.
VCC4 ------ DC3.5--4.5 masukan Onboard Sumber: sirkuit Serial port (dengan perlindungan) Antena rangkaian antarmuka (SMA tikungan pelabuhan perempuan) sirkuit kartu SIM (sandal slot SIM) 4 * 3,5 perlengkapan lubang 4pcs terminal keluaran SIM900A port serial Spesifikasi: Ukuran: 49mm x 47mm Berat Bersih: 28g Berat: 38g

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