Question about FTDI cables

[inuyasha84]

so it is normal the fact that I see the signal changed?

"Word to the wise. Not only do RS232 level shifting devices (e.g. MAX232) level shift, but they also invert the signal."

this confuse me.

[Ferchu]

What version of FTDI are you using?

[inuyasha84]

it is the TTL232RG-VREG3V3

[Ferchu]

Can you please try this setting on the visa and run your VI.

w

What do you get out of it?

[inuyasha84]

Hi ferchu. Always the same. One thing that is strange is that the FTDI that I'm using on the datasheet says 3V3 but when I measure it shows 5V.

[Ferchu]

Have you got a voltage regulator in place?

TTL-232RGVREG3V3-WE
USB to UART cable with +3.3V TTL
level UART signals. Maximum output
of 250mA on VCC
(see Note 2 and 5)
Wire Ended (no
connector)
6 core, UL2464 24 AWG,
diam=5mm

Note 2: Any regulator from 1.8V to 5V can be used. 1.8V and 3.3V versions are standard products.
Others values are customized at the factory.

Note 5: The VCC power output signal (RED wire) is 3.3V. The source of 3.3V is on board 3.3V regulator output, which
is switched onto the power output signal

[inuyasha84]

the cable is connected to the pc-usb. the measurement has been done with a professional tester.