Kenwood TM-D700A Pages by Jim
Commands for Serial Port Control
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Change TM-D700A's TNC Mode Remotely via the Serial
Thanks for visiting my D700a page. This page is still going strong
after all these years, getting close to 300 visitors a month from all
over the world. I haven't had time to work on this data much over
the years, with family and job obligations, but this information still
remains current. If you have any additional information or corrections
for this page, please email them to me.
The following information was submitted
by Steven S. Dick <firstname.lastname@example.org>:
I have discovered some additional serial
commands missing from your
page at http://jgav.com/ham/tmd700a.htm
REP 1 locked band repeat
REP 2 cross band repeat
1-A-3 Remote control
RC 1 remote control on
These do not require a power cycle to change, but may require other
things to be set first, and enabling either repeater or remote control
disables almost everything else (except disabling them).
menu 1-3-1 programmable VFO (pg 64) (only available in VFO mode)
default values on my radio:
Non menu items (I have more, but here's a few):
AG B,XX set volume (B=0,1 XX=00-3F) (canceled on knob change, not saved)
SQ B,XX set squelch (XX=00-1F) (not sure this is effective)
[note from Jim:] The work I originally
did way back in 2000 only focused on the commands to control settings
on the radio via a computer, that would normally be done on the front
panel or microphone buttons. I never did take the time to experiment
with or document the commands to enter frequencies, channel memory contents,
etc. That information should be easily located with a Google Search.
This content was finally put back online
thanks to the generosity of the folks on the TMD700A
Group at Yahoo. I had lost this information long ago due to
a hard drive crash, and I discovered that someone had archived it at
the Group. Thanks to Ken N5EQT for alerting me to it!
So here is the data, back in its original
The following was discovered by Bob Bruninga
about the TMD700A. This will allow his software (and those typing
manually) to command the TNC in the radio to switch between any and
all modes without touching the radio! Here it is, I will be "cleaning
it up" and moving it to a separate page soon, just wanted to share the
I have to thank BOB B for finding the Missing
Link - The Golden Nugget.... how to change to remote control mode when
in the TNC PACKET mode!!! This is the key to making that fabulous
all-in-one satellite ground station with total remote control ability.
Your serial port on your computer must be 9600,n,8,1. First, enter
AI 1 to get the radio to be in "Command Echo" mode when in radio remote
control mode. That way you can see the LIST data and so forth
coming back to you while you are in APRS mode. This would be handy
for an "ALL IN ONE" software program that did memory control, freq change,
packet sending and monitoring, APRS sending and monitoring, etc. "The
4 Feb 2000: Some additional experimentation
has clarified the control abilities for the radio - I am now defining
four seperate "modes" that the serial port/TNC can be in: OFF,
Radio Control (hereinafter referred to as RC), APRS,
and PACKET. Definitions:
OFF: The TNC is not on, and
the radio will not send/receive data over the air. Note that in
this mode the radio will still accept control commands over the serial
RC: The radio shows on the display TNC PKT (Packet)
mode, but the TNC is not able to actually Tx or Rx data. This is a quick,
temporary mode used to change band or frequency, etc. You would
normally then jump right back into Packet mode to continue receiving
APRS: The radio shows on the display that it
is in TNC APRS mode. The radio can Tx/Rx APRS formatted data on
its own without any outside software, like you would normally do as
you drive around using the radio's internal APRS software. Note
that in this mode the radio will still accept control commands over
the serial port to change band, freq., etc.
PACKET: The radio shows on the display TNC PKT
(Packet), and the TNC is at the "cmd:" prompt like you are used to with
most TNCs. You can Tx/Rx AX.25 data with the data coming out of
the serial port - the internal APRS software is not active.
Enter AI 1 (Alpha India
space One) while in OFF, RC, or APRS mode to turn on the "monitoring"
feature. This will "echo" or "return" the control commands for
what the radio is doing at the time. Enter AI 0
(Alpha India space Zero) to turn off this "echo", but the radio
will still accept commands while in this state. However it might
be easier to enter your commands while in AI 1 mode so you can at least
get responses from the radio when you enter your commands.
Update 5 Feb 2000:
Another problem I discovered, which should have been obvious, is that
to switch from TNC PKT (Packet mode) to any other mode, you must remember
to drop to cmd: (command mode) on the TNC if you are in converse mode.
It's easy to forget that this is still a TNC, and if you enter a command
while in packet mode, you might end up having it go out over the air,
since your TNC may likely be in CONVERSE mode. So, remember to
send a CTRL-C if necessary! So much to remember and check... but
I will share everything I find if the rest of you do the same!
The following commands should be sent in
| TO GO TO
| SEND THIS
| Is there a delay
for the TNC
|| TNC 1
2 then TC 0
|| (not necessary)*
|| TNC 0
|| (not necessary)*
2 then TC 0
|| TNC 0
|| TNC 1
|| TC 0
1 then TNC 0
|| TC 1
1 then TNC 1
* Don't forget to send
a Ctrl-C (alt-3 on keypad, hex $03, etc) to get out of converse mode
on the TNC if necessary!
You can enter any Radio Control (RC) commands
while in the OFF or APRS modes.
Once in PACKET mode at any time, you may
need to enter HB 1200 or HB 9600 to set the proper packet speed after
switching modes. To switch speed while in APRS mode, use PKSA
0 for 1200, PKSA 1 for 9600.
I tried to make the above chart as clear
as possible, email me if you want to correct something.
Thanks to Bob B as always for his research