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Author Topic: Testing Serial Ports - RS-232  (Read 525 times)
AF4OX
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Posts: 20




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« on: June 26, 2006, 05:40:06 AM »

I am having problems getting MMTY to work.  I suspect my PC serial port is not working properly.  Pin 3 on DB9 connector (TXD) from my Dell PC does not seem to shift voltage from - 11 volts to + 11 volts in order to operate Mark/Space.  Pin 7 (RTS) for PTT and Pin 4 (DTR) for CW keying shift voltage and these functions work.  Only Pin 3 does not seem to shift voltage

How can I best test the serial port - that is, how can I make PIn 3 (TXD) operate independent of MTTY to be sure that the problem is in the hardware?

Bob
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AA4PB
Member

Posts: 12892




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« Reply #1 on: June 26, 2006, 01:38:47 PM »

Run Windows HyperTerm and set it for the com port you want to test. Type on HyperTerm and watch the TXD pin with a scope.
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W7AIT
Member

Posts: 489




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« Reply #2 on: June 30, 2006, 12:25:49 PM »

I run MMTTY here from Dell 2400 serial port through a RIGBLASTER Pro interface.  Radios TS570 or TS2000.  The Rigblaster Pro required non standard modification of the jumpers to get it to work on RTTY.

So that raises the question, what kind of radio / radio interface if any are you using?

BTW, the Dell serial port plugs DIRECTLY into TS570 / TS2000 serial port and everything works (running Ham Radio Deluxe software).

The previous post - running hyper terminal - is a good idea too.  If everything is working, should be able to communicate.

Measuring voltage on pins may not work as the signals may only be there for milliseconds and your meter may not catch it.  A scope might work.
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