4-4-10 TRIES command
abbrev. TRI default: 0 parameter: 0-15
example: TRI 0
This is to display and adjust the current retry counter. If the command TRIES is entered, it might report
back TRIES 9. You can enter TRIES 2 and in doing so, you reset the number of TRIES before reaching
the cutoff figure set under RETRY.
4-4-11 CHECK command
abbrev. CH default 30 parameter: 0-250
example CH12
When connected, even without sending data, this command sends a message to the effect of “Are
you still there?” to check if the link is still present. This parameter sets the time between the
sending of the check-packet (“Are you still there?”) after the destination’s signal is received, in 10
ms unit.
4-4-12 FIRMRNR command
abbrev.: FIR default: OFF parameter: ON/OFF
example: FIR ON
When the “Wait a moment!” message (RNR frame= not available for reception) is received from
the destination, this parameter determines how your station will proceed with sending your
packet.
When the setting is in the ON position and you receive RNR frame, it does not transmit the
packet until you receive another frame from the destination. In the OFF position, it will transmit
the packet regardless of the RNR status. This may result in poor communications efficiency by
sending packets that will not be received.
4-5 Unconnected messages or “UNPROTO” commands
These commands are used when sending packets without being connected to another station.
Some examples of unconnected messages might be a “CQ” message, an informational beacon, a
chat session with many stations or APRS location beacons.
In this mode, the receiving station(s) will discard incomplete data without requesting a retry and
the transmitting station does not re-transmit. Accordingly there is no guarantee of error-free
transmission in this mode. In this chapter we explain:
l UNPROTO to set the destination and relay stations without being connected
l BEACON, BTEXT for the beacon related commands
To broadcast the GPS data there are LPATH, LOCATION, and LTEXT commands. These will be
explained in the GPS chapter, but they are similar to UNPROTO, BEACON and BTEXT so that
they may be used as the secondary beacons.
(47 paginas)
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