Kantronics KPC–3 Plus User Manual page 210

Cable Wiring
All Kantronics software requires five wires between the computer and the KPC-3 Plus.
The pins that must be connected from your KPC-3 Plus to the computer for these
programs are TXD, RXD, SG, RTS, and CTS. If you are using other software, you
should refer to that documentation to determine the cable requirements for proper
operation. Some software does not support hardware flow control and may fail to
operate if the RTS and CTS lines are connected.
The KPC-3 Plus serial port connector has 25 pins, which are configured at the factory
as:
Pin Name
FG
TXD
RXD
RTS
CTS
DSR
SG
DCD
DTR
NOTE: FG (Frame Ground) and SG (Signal Ground) are tied together in the KPC-3
Plus.
The purpose of the pins (by name) is:
FG - FRAME GROUND: This pin is attached to the chassis of the equipment as a safety
ground.
SG – SIGNAL GROUND: Common line for signals.
TXD - TRANSMIT DATA: This line carries the data from your computer to the KPC-3
Plus.
RXD - RECEIVE DATA: This line carries the data from the KPC-3 Plus to your
computer.
KPC-3 Plus Computer Pin Number
Pin Number (DSUB-25)
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
20 20
Computer Pin Number
(DSUB-9)
N/A
3
2
7
8
6
5
1
4
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