| ??? 01/24/09 23:46 Modified: 01/25/09 00:21 Read: times Msg Score: -1 -1 Answer is Wrong |
#161721 - GSM Module serial interface Responding to: ???'s previous message |
Nes Yox said:
Hello
I need to communicate gsm module. as it use asci AT commands I ask if I can connect the modems serial port directly to the microcontroller such as 89s51/8051 or I need interface? Answers: Yes ----- If the 80c51 is a 3V device and the GSM module has UART 3V CMOS logic serial in/out. If it's 5v 80c51 then you will need some 5v to 3v logic conversion. No --- If the GSM terminal with RS232 i/o. You can't directly connect R232 to the pins of the 80c51 you will need a Rs232 logic level converter like a MAX232. For RS232 See here www.8052.com/users/jonled/RS232gd.pdf I find it best to get a GSM with RS232 in/out so you can connect it to a IBM PC and use a terminal program like Hyperterminal to send the AT commands 1st, testing and learning about the commands GSM Module example 
GSM Terminal example 
Regs Joe |
| Topic | Author | Date |
| rs232 serial communication and microcontroller | 01/01/70 00:00 | |
| Cross-post | 01/01/70 00:00 | |
| GSM Module serial interface | 01/01/70 00:00 | |
| Not true | 01/01/70 00:00 | |
| Ive corected my post | 01/01/70 00:00 | |
| That's confusing! | 01/01/70 00:00 | |
| A case in point | 01/01/70 00:00 | |
| depends... | 01/01/70 00:00 | |
| more spesipic | 01/01/70 00:00 | |
| Set up matrix | 01/01/70 00:00 | |
| More info required! | 01/01/70 00:00 | |
| Layers | 01/01/70 00:00 | |
RS232 and Serial Communications | 01/01/70 00:00 | |
| Resistor is NOT an answer! | 01/01/70 00:00 |