rs232 serial communication

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?
RS232 serial communication

i need to write a program to send a set of data from PC to 8051 through the rs232. How can find the sample source code and referance material for that. Thx for your help.
rs232 serial communication

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?
RS232 serial communication

i need to write a program to send a set of data from PC to 8051 through the rs232. How can find the sample source code and referance material for that. Thx for your help.
8051 communication with RS232

I have used USB to RS232 converter to transfer my USB port on PC to RS232 port which performs communication with 8051. The problem is why my PC only can receive unexpected garbage code. My 8051 and PC...