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GPRS source
2008-07-14
Xin Wang welding of hardware at first came back after missing a few capacitors and one of 100k resistance, main is the power supply capacitor energy storage function,
Sim300 100k resistance between simpress VEXT and PIN on the SIM card, no welding is when you can find the network, but will occur
NET, and after make up these, no problem. Previous experience of the circuit it is quite accurate. The power supply must be stable.
Text message as soon after the initialization is complete, the first text message failed. In serial port receive and send text messages while waiting for the module to return information,
Return call was ready, then can be sent out. This should be the module was not ready. Call Ready
When searching the network began to send a text message, +CMS ERROR:517 this error sometimes occurs, should be the SIM card is not ready, so when searching the network
Need to wait for a while after. Module Call Ready signal is issued, then action.
2008-7-19
This morning ready to debug the module found in the home network could not always find, in which cards are not, think that it is a module of weld is not good,
From the company taking over bumpy has come loose.
2008-7-26
Not found in the Home module always play to the network
2008-8-5
Send data transfer over GPRS
| Name | Size | Date |
| 0.00 B | 05-08-08 22:43 | |
| 1.04 kB | 06-07-08 23:06 | |
| 1.13 kB | 08-07-08 11:13 | |
| 2.17 kB | 05-08-08 20:47 | |
| 11.18 kB | 05-08-08 20:47 | |
| 4.69 kB | 14-07-08 20:06 | |
| 1.12 kB | 08-07-08 21:48 | |
| 10.73 kB | 05-08-08 20:47 | |
| 13.99 kB | 05-08-08 20:47 | |
| 2.61 kB | 14-07-08 20:02 | |
| 1.38 kB | 05-08-08 22:41 | |
| 4.08 kB | 05-08-08 20:47 | |
| 13.16 kB | 05-08-08 20:47 | |
| 21.71 kB | 05-08-08 20:47 | |
| 1.47 kB | 05-08-08 20:46 | |
| 47.00 kB | 05-08-08 20:47 | |
| 38.18 kB | 05-08-08 20:47 | |
| 109.32 kB | 05-08-08 20:47 | |
| 15.69 kB | 05-08-08 20:47 | |
| 143.00 B | 05-08-08 20:47 | |
| 44.78 kB | 05-08-08 20:47 | |
| 2.75 kB | 05-08-08 20:50 | |
| 7.81 kB | 05-08-08 20:50 | |
| 2.14 kB | 14-07-08 20:18 | |
| 2.75 kB | 05-08-08 20:19 | |
| 2.17 kB | 14-07-08 20:04 | |
| 1.63 kB | 14-07-08 20:19 | |
| 1.78 kB | 08-07-08 12:06 | |
| 3.85 kB | 05-08-08 20:47 | |
| 14.02 kB | 05-08-08 20:47 | |
| 4.24 kB | 14-07-08 20:18 | |
| 1.25 kB | 08-07-08 11:21 | |
| 8.58 kB | 05-08-08 20:47 | |
| 16.54 kB | 05-08-08 20:47 | |
| 1.15 kB | 14-07-08 20:03 | |
| 1.93 kB | 14-07-08 20:04 | |
| 2.31 kB | 05-08-08 20:47 | |
| 11.46 kB | 05-08-08 20:47 | |
| 1.59 kB | 05-08-08 22:43 |