FT727R.1

Subject: YAESU FT-727R CAT SYSTEM INTERFACING AND CONTROL INFORMATION

This information describes the hardware and software requirements of
the CAT (Computer Aided Tranceiver) System in the FT-727R.

Connections

Four connections are used by the CAT SystemL three at the CAT jack,
illustrated below, and one (Signal Ground) at the outer contact of the
MIC or EAR jack.

DO NOT SHORT THE OUTER CONTACT OF THE CAT JACK TO GROUND!!!

[Diagram of the CAT plug:
-Looks like a stereo audio jack of the appropriate size.
-The outer sleeve is +6 to +12 V DC (Battery Voltage) I do not think
this line needs to be connected.
-The middle contact is the Serial KeyCode Input.
-The center contact is the Serial Meter Output (00h to 0Fh).
See the manual for further description.

Data Format:

All serial data consists of single byte binary codes sent at 4800
baud, TTL levels, with two INVERTED stop bits and one INVERTED start
bit.
CONTINUED IN FILE FT727R.2