SIM900A is a module provided by SIMCom Limited, which has a standard AT command interface and can provide GSM voice, short message and other services.
This manual describes the hardware architecture of the SIM900A GSM module, including detailed pin assignments, power supply specifications, and recommended circuit layouts. It also covers mechanical dimensions and mounting guidelines to help designers integrate the module into their products.
Additional sections provide information on regulatory compliance, test procedures, and contact details for technical support. The document is intended for hardware engineers developing devices that incorporate the SIM900A module. This manual is written in Chinese.
The support phone number is +86 21 3235 3300.
The support website is www.sim.com/wm.