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The TT4 to computer connection has 2 different baud rates.
When the TT4 "powers up", it starts in "boot loader" mode at a baud rate of 19200 -> either port (Port A or Port B).
? ?This is explained in the Tiny Trak4 Quick Start Guide on page 2 under Configure the Alpha firmware.
? ?The boot loader is what will provide the message "?" followed by "Press ESC 3 times to enter TT4 Options Menu"
? ? ? NOTE:? the "?" is the actual boot loader that is used to update the firmware itself.
? ? ? ? ? ? ? ? ? ?the second message "Press ESC 3 times to enter TT4 Options Menu" is the one for configuring the settings.
? ? ? ? ? ? ? ? ? ?You will need to press Esc 3 times within a couple of seconds of seeing that message (or just press t several times while starting the TT4).
TeraTerm is just a terminal, and has no special mode for this - just set the com port and baud rate to match your interface.
? ?It is unlikely the port is the RT Systems.
? ?You will have to determine if the correct port is COM5 or COM6 (try each while powering the TT4).? When you see the "Press Esc ..." you found it.
? ?Again, the baud rate for this step is ALWAYS 19200,n,8,1.
IMPORTANT:? when using a USB to TTL cord (such as the Byonics TT-USB) that has power on pin4, it is VERY IMPOLRTANT you make the connection at the DE9 connector with TeraTerm running at the correct settings.? You cannot "reconnect" at the PC USB port, as that will cause TeraTerm to "forget" the COM# port and it will not be reay for use when the TT4 sends the "Press Esc ..." information.

After the TT4 finishes the boot sequence (unless you press Esc 3 times to interrupt it), it will change to the firmware settings (ABAUD or BBAUD depending on the connection).??
? ?The "on air" (1200 baud) baud rate is of no value for this configuration.

Has a few cables that could help:
Yaesu CT-167: connect pins 1, 2, 3, 5, and 6 to the TT4 by soldering on a DE9 with the matching assignments as the TT4.
Yaesu CT-164: This would act as an adaptor to use with the Byonics M12 cable.
Yaesu CT-163: This would act as an adaptor to use with the Byonics M12 cable, but also give a DE9 connection for the PC control?

The best part of using the 10-pn jack is that the audio levels are fixed, and the radio speaker is still available to listen to.
You don't have to be very handy with a soldering iron to handle the CT-167 option, and it's a single cable.? You do need a matching DE9 to J1 on the TT4.

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Robert Giuliano
KB8RCO

Robert,

I’m new to the group after receiving several TT4 devices, and I am in the process of getting them ready for addition to our ARES go bags using the process you describe to modify settings.?

?

My question is with an older TT4, which I received from a Silent Key that I believe is about 10-years old. Using the same cables from the newer TT4’s and software settings, my terminal program responds with a “?” but nothing else follows unlike the newer devices.??Experimenting by switching the baud rate from 19200 to 4800 my terminal program responds with “TinyTrak4 v4.05”. In both situations, there is no response to any keyboard input?

?

Do you have any idea what may be causing this?

Thanks?