The purposes of the pins (by name) are as follows:
FG - FRAME GROUND: This pin is attached to the chassis of the equipment as
a safety ground.
TXD - TRANSMIT DATA: This line carries the data from your computer to the
KAM’98.
RXD - RECEIVE DATA: This line carries the data from the KAM’98 to your
computer.
RTS - REQUEST TO SEND: The KAM’98 checks this line to see if it is permit
-
ted to send data to your computer. This pin is controlled by your computer soft
-
ware program to provide this information to the KAM¹98. This pin is used for
hardware flow control.
CTS - CLEAR TO SEND: The KAM’98 uses this line to signal your computer
when it can no longer accept data from the computer, or to signal that it is again
ready to accept data. This pin is used for hardware flow control.
DSR - DATA SET READY: This line is set high to indicate that the modem is
ON.
DCD - DATA CARRIER DETECT: The KAM’98 uses this pin to signal the sta-
tus of the current I/O stream to your computer. If you are connected to another
packet station on the current I/O stream, this line will have a positive voltage on
it. If you are disconnected, the voltage on this line will be negative.
DTR - DATA TERMINAL READY: Although interconnected via a buffer IC to
the processor, this line is currently ignored.
Optional Wiring
It is possible to re-configure the DB-25 connector to allow some additional func
-
tions through this connector.
Applying Power through the DB-25 connector.
If desired, you may apply DC power to the KAM’98 from Pin 25 (EXT-IN) of
the DB-25 connector. To enable this, connect J2 center pin and Pin 1, J1 center
pin and Pin 2.
Connecting to the Computer (DB-25) Appendix A: Advanced Installation
KAM’98 v 8.3 327 User’s Guide
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