Specifications

1212

12 / TNC GPS Upgrade Addendum

5. GSYMchar

6. Unproto

To remotely program the TNC, the programming station must have its Unproto destination call-

sign set to match the GPOLLcall of the TNC.

Example:

Let’s say you have a TNC in your car as a stand alone tracker with its GPOLLcall set to CAR. In

your house, you would program your TNC’s Unproto to CAR (U CAR). Now place your TNC in

converse mode by typing either (K or CONVerse). If you wanted to change the TNC in the

car’s Unproto path, you would simply type U APRS via RELAY <CR>. Your TNC in your home

would transmit the following frame:

Home TNC:

{your callsign}*>CAR [UI]:

U APRS via RELAY

TNC in car would reply:

PK12*>RELAY>APRS [UI]:

++ done

Note that the TNC in the vehicle replied with the message ++ done. This indicates that the com-

mand was properly received and the parameter was changed. The following is a list of additional

messages and their meaning.

Remote programming messages:

Message Meaning

++ done the parameter was programmed

++ bad not supported, incorrect format, or bad data

++ too many too many parameters entered

++ range numeric entry is too large

GSYMChar “n” Default: 0 None

This is a Hex value ranging from 0-255 that represents a symbol in APRS software. The symbol

char will be enclosed in curly brackets before all Beacon transmissions.

KA7SYZ*>RELAY>APRS [UI]:

{SYMChar} This is a sample UI frame...

GUNSTart ON|OFFDefault: OFF

ON - The TNC starts in CONVERSE mode after a restart or power-up.

OFF - The TNC will power-up in command mode.

This command allows the TNC to power-up in the converse mode if turned on.