[Elecraft] KPA1500 XCVR serial connection

[Paul Baldock]

The manual on page 24 says:

Serial: A Kenwood, Yaesu, Elecraft K2, K3, K3S, 
KX2, or KX3, or FlexRadio® transceiver that 
responds to IF; FA; FB; FT; polls with frequency 
and VFO information. The XCVR SERIAL connector is 
configured as TTL-level RS-232

Is it really TTL?. I planned to use this 
connected to the serial data line that goes 
between my Kenwood TS-990 and PC, such that the 
KPA1500 will catch the frequency data triggered 
by my logging program. This works great with the 
KPA500 which I assume  uses true RS232 levels. If 
the KPA1500 does indeed use TTL levels will it 
capture the data, and will it not corrupt the 
RS232 levels between the PC and TS-990?

Thanks

- Paul  KW7Y