Hi everyone --
Do you have a TS-940 with the IF-10B board installed? If so, could you
take a few simple measurements?
I'm debugging my TS-940 interface to the computer. The radio has the
IF-10B board installed inside. But the voltages present on the 6-pin ACC
connector at the back of the radio does not make sense, when compared with
the documentation.
Before I tear into the IF-10B itself (or replace it), I'd like to compare
my measurements with someone who has a properly-functioning TS-940-computer
interface.
Here is what I measure with a high-impedance voltmeter at the 6-pin round
DIN connector (no connection to any external level converters; i.e., just
voltages presented by the IF-10B to the outside world):
pin 1: documented as "signal ground". measures +0.07v against chassis
ground.
All other pins are measured against pin 1:
pin 2: documented as "RXD-bar". appears to float, as it should if it is a
data input lead.
pin 3: documented as "TXD-bar". measures +5.01v. This seems wrong to me.
TXD should be held at a 'mark' condition until there is something to send.
So TXD-bar should be the inverse of that, or 0v??
pin 4: documented as "CTS". measures at +5.01v. That also seems odd: CTS
is a signal input, not output.
pin 5: documented as "RTS". measures at +5.01v.
pin 6: documented inconsistently as VDD (TS-940 service manual) and NC
(IF-10 documentation in Japanese). Mine measures at +0.02v, which argues
for "NC" (not connected).
Do you measure the same voltages?
Thanks!
-- Eric K3NA
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