48
SERIAL
Mode is compatible with KX3, KX2, FlexRadio and many Kenwood transceivers that respond to
IF;
FB;
polls with frequency and VFO information.
For a KX3 or KX2, make a cable with 3.5mm TRS plugs on each end. Cross over tip to ring as shown in Figure
14 below.
Figure 14. Serial Data 3.5mm TRS Plug Cross-Over Cable for KX3 and KX2.
3.5mm TRS
Plug A
3.5mm TRS
Plug B
TIP
RING
RING
TIP
SLEEVE
SLEEVE
For transceivers using DE-9 connectors, use a female DE-9 connector and a shielded two-wire cable to a 3.5mm
phone plug into the KPA1500
XCVR SERIAL
port. The KPA1500 does not support hardware handshaking.
Select a baud rate slow enough to ensure buffer overflows do not occur.
DE-9 Pin
Function
KPA1500 3.5mm Plug
2 (RXD)
Radio sends to KPA1500
TIP
3 (TXD)
KPA1500 sends to radio
RING
5 (GND)
Ground (Shield)
SLEEVE
7 (RTS)
Request to send (RTS)
Jumper to Pin 8 (CTS)
N/C
8 (CTS)
Clear to send (CTS)
Jumper to Pin 7 (RTS)
N/C
