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I guess you can try with the connection like this:
8051's tx pin to rs232's tx pin; 8051's rx to rs232's rx, of course with MAX232 in between, I get it done with this connection.
I've tried this sms sending program again, but unfortunately the program still stops when it is supposed to receive the status from the MC35i, does it mean that the MC35i did not receive any message? Or it did not send any response to the 8951? How can I trace this problem?
Another problem is...
Thanks budhy for your schematic diagram, but I have some questions:
1. Since I'm using MC35i, do I need to change the baud rate to 19200 instead of 9600?
2. Pin 7, 10, 12 and 13 of MAX232 have to be grounded or just leave it? And some diagrams show that the capacitance value is 10uF instead of...
Too bad my 8951 chip is not functioning now, even a simplest program also it doesn't run, it is so weird that I haven't touched it after I've finished trying yesterday, yet it doesn't work at all when I tried today...
I'll look for another chip soon, but I am curious, why is this 8051 chip so...
I'm now continuing on my sms sending via handphone and AT89S51, when I run the program, the program runs and then stops when it tries to receive the status from phone, below is my program:
ORG 0000H ;Power up
SJMP MAIN
ORG 50H
MAIN:
MOV...
I obtain 5V when I measure the voltage at these 2 pins, should be ok... This is another 8951 that I've bought, quite new, shouldn't be a problem as well.
It is also around 1.8V, very weird.
Added after 1 minutes:
But the problem is that the LCD treats the input to it is low, since 1.8V is too low to drive the LCD, there isn't any display on the LCD.
nokia phone at command
But as far as I concerned, the port 1, 2 and 3 are already pulled up internally, do we still need to pull them up externally?
P/s: I'm using port 1
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