Hello Prasad,
I built the Easy-Downloader V1.1 for ATMEL 89C2051/4051
Wichit Sirichote, (kswichit@kmitl.ac.th)and it worked the first time. Make sure your communication program is set up properly. 9600 baud, 8 data bits, no parity, 1 stop bit.
Regards,
Charles Bannister

Follow the below instructions to check operational status of your programmer.
Functional Test
Use a given programmer (or ready made Easy-Downloader) write the writer.hex into the 2051 chip. Put the programmed 2051 chip to the board. Invoke any communication software with 9600 baud, 8-data bit, no parity. Connect DB-9 to COM1, say, press enter key, the title "Easy-Downloader V1.1 for ATMEL 89C2051/4051" would be appeared on the screen. type >s2048 ( set byte counter to 2k), then without the 2051 chip in ZIF, type >r (read 2kB), on screen would show FFFFFFFFFFF... indicating corrected wiring for P1. If you put the chip having already program inside, r command will show the hex code with the number of byte set by s command. Try e command to erase the entire program!! All done. Figure 2 shows example of using Xtalk program to test the board.