4/05
©2005 Kantronics Inc.
J6: EXT-IN Reset / Input Select
1 CTR 2
EXT-IN is external reset input.
1 CTR 2
EXT-IN is external power input.
1 CTR 2
EXT-IN not connected. (default)
J7: EXT-IN Port Select
1 CTR 2
EXT-IN connects via Computer Port pin 13.
1 CTR 2
EXT-IN connects via Radio Port pin 7. (default)
J8: Analog Input AN0 (channel 0) port select
1 CTR 2
Radio port pin 4
1 CTR 2
Computer port pin 18
J9: (NOR/HT) Configures the AFSK output line NOR CTR HT
Normal, for base station use. (default)
NOR CTR HT
AFSK output line also serves as PTT (for HT radios)
J10: Analog Input AN1 (channel 1) port select
1 CTR 2
Radio port pin 8
1 CTR 2
Computer port pin 11
Computer / GPS Port (DB-25) Pin-out:
Pin no.
Signal name
Function
Related Jumpers
1
FG
Frame Ground. Connected to the equipment chassis as
a safety ground.
2
TXD
Transmit Data: Carries data from a computer or GPS to
the KPC-3+
3
RXD
Receive Data: Carries data from KPC-3+ to a computer
4
RTS
Request to Send. Tells the KPC-3+ when the computer
is ready to accept more input from the KPC-3+. Used for
hardware flow control.
5
CTS
Clear to Send. Indicates whether KPC-3+ is ready to
accept more input from the computer. Used for hardware
flow control.
7
SG
Signal Ground. Common reference line for signals.
(Internally tied to frame ground in the KPC-3+).
6
DSR
Data Set Ready. Indicates the KPC-3+ is powered up.
8
DCD
Data Carrier Detect. Signals the status of the current I/O
stream to your computer. If you are connected to another
packet station on the current I/O stream, this output will
have a positive voltage on it. If you are disconnected, the
voltage on this output will be negative.
11
None / AN1
None / Analog Input channel 1 (jumper selectable)
J10
13
None / EXT-IN
None / External Power Input / External Reset Input
(jumper selectable)
J6, J7
18
None / AN0
None / Analog Input channel 0 (jumper selectable)
J8
20
DTR
Data Terminal Ready.
Usually indicates when the computer’s port is active.
Currently ignored by the KPC-3+
Notes:
To prevent damage to your PC or other external device, make sure that the jumpers controlling he
use of pin 13 of this port are in their factory default “none” position if you are not using a cable specifically wired for
external power / external reset applications.
All cables must be well shielded.
