Problems with Mon51 connection using AT89S53 through RS232

I'm using keil c51 7.06 My Problem is that uVision always shows monitor 51 not connected. I use RS-232 interface and ATMEL "AT89S53" Could anybody help me? RAY
Problems with Mon51 connection using AT89S53 through RS232

I'm using keil c51 7.06 My Problem is that uVision always shows monitor 51 not connected. I use RS-232 interface and ATMEL "AT89S53" Could anybody help me? RAY
Connecting two MCB900 [Not with RS232]

I am a begginer for Microcontrollers. I want to connect two MCB900 by wires. Please help me, My friend told me that I need three wires... But I lost his contact & I donno what are three connections in...
Connecting two MCB900 [Not with RS232]

I am a begginer for Microcontrollers. I want to connect two MCB900 by wires. Please help me, My friend told me that I need three wires... But I lost his contact & I donno what are three connections in...
USB/RS232 connection

Hi, I am a beginner in using µvision I have "LPC1788 Developer's Kit" and I want to write a program for my microcontroller in order to receive a message via the USB port and send it via the RS232...