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???
07/17/08 16:54
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 		 #156809 - analog -vs- DSO
Responding to: ???'s previous message
The data stream toggles plus and minus from center ground as expected but I am using a analog Tektronix model 2235 to view the signal. No budget for one of those fancy DSO problem solvers.

My quick eye sees the data stream and the time base is within the 9600 baud time frame. As viewed by the naked eye.

The data bits are seen as square waves with sloped rise and fall edges almost making them triangular.

My null modem cable is shielded and factory built 4' in length.

But pin 5 (ground) is not connected to the shell, pin 5 is grounded at my power supply and the Maxim IC.

The shell is connected to earth ground. Which when connected on my bench means it is not connected to anything. Once the board is in a metal box the shell is grounded to earth ground via a mounting screw that holds the board in place inside the metal box.

List of 32 messages in thread
TopicAuthorDate
SCON code question - data not seen            01/01/70 00:00      
   do you use a proper level convertor?            01/01/70 00:00      
      new cable            01/01/70 00:00      
   two different lever convertors            01/01/70 00:00      
   Check pins on cable            01/01/70 00:00      
      the cable appears to be correct            01/01/70 00:00      
   is data correct on the scope?            01/01/70 00:00      
      analog -vs- DSO            01/01/70 00:00      
         Triangular??            01/01/70 00:00      
         analog scope            01/01/70 00:00      
            oops - use 0x55            01/01/70 00:00      
   check Flow Control            01/01/70 00:00      
   Basics            01/01/70 00:00      
      Thanks Jon            01/01/70 00:00      
   Program works            01/01/70 00:00      
      feed through that wasn't            01/01/70 00:00      
         Correct spelling            01/01/70 00:00      
            just for the numbers or all characters?            01/01/70 00:00      
               In your case, to all            01/01/70 00:00      
                  fixed and not fixed            01/01/70 00:00      
                     not in that code            01/01/70 00:00      
   read mov data, data instruction            01/01/70 00:00      
      biblical            01/01/70 00:00      
         mov direct, direct instruction            01/01/70 00:00      
            to solve this            01/01/70 00:00      
            We talk of mnemonics            01/01/70 00:00      
               what matters is inside mcu            01/01/70 00:00      
                  The manufacturer defines            01/01/70 00:00      
                     Motorola versus Intel            01/01/70 00:00      
                  amateurs might hve some such, but no ..            01/01/70 00:00      
                     the assembler I use            01/01/70 00:00      
            no, it will not            01/01/70 00:00      

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