Bob,
I too find TXD voltages in the KIO2 manual are a bit confusing. They are
correct only if one looks at the active signal, but that will never be read
on a voltmeter - a 'scope is needed to show it. (the same set of problems
are present in the KPA100 manual too).
The normal voltage for pin 12 (K2 TXD) is 0 volts and goes to 5 volts when a
data bit is transmitted.
On the RS-232 side (pin 5), about 13 volts is to be expected when the input
pin (12) is at 0 volts, and it should go to -8 volts or so at the times pin
12 is at 5 volts.
Do you have the menu PORT parameter set to ON?
73,
Don W3FPR
----- Original Message -----
>
> My KIO2 has just stopped communicating.
> Osc is OK, neg volts -10
>
> Volt checks look OK except for
>
> U1 Pin 5 which is 13 should be -8
> U1 Pin 12 is 0 should be 5?
>
> BUT U1 pin 5 goes to the TXD line and thence to the control boards U6 pin
> 25, which is shown in the Manual as being at 0 normally.
>
> Any ideas appreciated
>
> 73 and thanks for reading this
>
> Bob G3PJT
>
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