[TenTec] Serial interface between Omni VI+ and computer

Dr. Gerald N. Johnson geraldj at weather.net
Sat Mar 26 12:52:09 PDT 2011

Is the rig RS-232 or is it TTL? If you have to use a level converter 
from the computer serial port its sure the rig is TTL, like most ham 
rigs using CAT especially Icom which the Tentec seems to be copied 
after. Such level converters are readily available for replacing Icom 
hardware generally with your choice of USB or RS-232 connectors on one 
and and a miniature phone plug on the other.

Remember RS232 levels are usually -5 to -12 volts for logic 1 and +5 to 
+12 volts for logic 0 while TTL levels are 0 to 1 volt for logic 0 and 
+2 to +5 volts for logic 1. There is a polarity inversion as well as the 
level changes, though many RS-232 receivers ignore that specification 
and take +.5 to -12 as logic 1 and +2 to +12 as logic 0.

73, Jerry, K0CQ

On 3/26/2011 1:32 PM, RICHARD GUIDONE wrote:
> Hi all:   Due to a power spike this past summer the Omni stopped talking to my
> computer logging program as well as any other Ham related software.
> I have now done the following:   re-built the Model 305 level converter,
> verified that the computer's serial port is working with loop-back tests,  sent
> the rig to  Ten Tec and asked them to check the rig out (apparently its
> okay?).     During  a telephone call with Paul at Ten Tec I was told that Ten
> Tec no longer has the ability to test my Model 305 level converter which I was
> going to send them to repair since my repair didn't appear to work.
> I am now thinking about going inside the rig to replace the RS232 chip in the
> rig?
> Am I missing something?   Any suggestions?
> Ric - VE3XL
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