PTCiiUSB Modem ACC instructions to KX3/KX2 TTL or V24?

[Elecraft mailing list]

My KX2 operates Pactor 2 with RMS Express and Airmail on my PTCiiUSB
modem with the KX2 ACC cable for changing frequency.  But I also want to
connect the PTCiiUSB rig controls directly to the KX2 ACC socket to
avoid having to use the extra ACC cable.  I know the PTCiiUSB allows the
Kenwood instruction set that works on the KX3 and I think it also has
the K3 instruction set.  The connections are clear and making the cable
will be easy, except that the PTCiiUSB offers the options of TTL or V24
for the RXD and TXD connections.  Does anyone know whether the KX2 and
the KX3 use the TTL or the V24 protocols and whether connecting to the
wrong protocol will cause damage?

Chris, G4BTN

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[Don Wilhelm]

Chris,

I believe you could use either.  Their should be no damage to the KX2 if
the V24 levels are used.  To be safe, try TTL first - if it works, use
it.  If not, switch to V24.

73,
Don W3FPR

On 2/17/2017 7:12 AM, Chris via Elecraft wrote:

> My KX2 operates Pactor 2 with RMS Express and Airmail on my PTCiiUSB
> modem with the KX2 ACC cable for changing frequency.  But I also want to
> connect the PTCiiUSB rig controls directly to the KX2 ACC socket to
> avoid having to use the extra ACC cable.  I know the PTCiiUSB allows the
> Kenwood instruction set that works on the KX3 and I think it also has
> the K3 instruction set.  The connections are clear and making the cable
> will be easy, except that the PTCiiUSB offers the options of TTL or V24
> for the RXD and TXD connections.  Does anyone know whether the KX2 and
> the KX3 use the TTL or the V24 protocols and whether connecting to the
> wrong protocol will cause damage?
>

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[Lyle Johnson]

Chris,

The KX2 and KX3 use 12V switching levels for sending data out its serial
port.  It was designed to interface to "standard" RS232 serial ports.

I'd use standard RS232 levels first.  If that doesn't work, and If the
PTC modem in TTL mode is protected from 12V levels, I'd try that next.

73,

Lyle KK7P


On 2/17/17 5:12 AM, Chris via Elecraft wrote:
> ... Does anyone know whether the KX2 and
> the KX3 use the TTL or the V24 protocols and whether connecting to the
> wrong protocol will cause damage?

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