![]() ![]() Now that the serial program is running, and everything is connected to your computer, you'll see something like this when you power up the module: When the SIM900A starts up, it goes into an auto-baud detection state. When the serial program is opened, you can use any standard baud setting. To do the actual upgrade, I need to move over to my Windows computer. This is a Linux program, but that's OK this is only to check connections. To check that you've connected everything correctly, open up hyperTerm or some other serial communication program. ![]() To enable the MAX232 IC, you need to install some jumpers on the 2x3 pin header. One way is to use Transistor-Transistor logic (TTL) and the other is to use the onboard MAX232 IC. On this module, there are two different ways to connect it to other circuits. This program transfers the firmware from your computer to the SIMCOM module.įor hardware, I'm using a SIMCOM SIM900A module, a SIM card, a serial cable, a computer running windows, and a breadboard.Ĭonnect the components in accordance with this picture. ![]() To do the actual upgrade, you'll need a program called “Simcom – sim900 Customer flash loader”. In this article, I'm using ”1137B03SIM90064_ST_ENHANCE.cla” Use your preferred search engine to find the firmware file. To make it work, you'll need to do a firmware upgrade. The SIMCOM SIM 900A module is made for the Asian market, and will not get registered on a European network. ![]()
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