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Protocol Operation
Crescendo UHF Half-Duplex User Manual Page 38 of 78
6.5.5 DTR Modes
In addition to the AT commands that are used to control the dial-up connection, DTR may be configured to
provide similar functionality. Only the main port supports DTR, so the setting for DTR mode on the
auxiliary port Hayes protocol is not used.
There are four available DTR modes:
Ignore DTR: DTR is not used to control the Hayes communications settings.
Hangup on DTR Low: If DTR is low then the radio will hang-up the current connection. If DTR is
low when a dial attempt is made, then the connection will be severed immediately after being
established.
Hangup on DTR Dropped: If a falling edge (high to low transition) is detected on the DTR line, the
radio will hang-up the current connection.
Local Mode on DTR Dropped: If the radio is online, and a falling edge (high to low transition) is
detected on the DTR line, the radio modem will return to local command state but will remain
connected. To return to the online state, issue the ATO command. The next falling edge on the DTR
line will cause the radio to enter local mode again.
6.5.6 Traceroute
The AT commands may be used to obtain diagnostic information from the radio network. The ATT
command is used to start a traceroute diagnostic to a destination radio. The syntax of the ATT command is:
ATT<address>
Where <address> is the address of the destination radio.
The traceroute diagnostic periodically sends a query to the destination radio and expects a response. The
traceroute response will contain the RSSI, and counts of bad headers, bad packets, and retries. It can be
stopped by sending any character to the radio. The traceroute diagnostic will then display the number of
requests and responses in the session, and return the port to local command mode.
att2000
695 ms (660 ms) | 1 sent, 0 lost
1001 -> (2000, -59 dBm, 0 BH, 0 BP, 0 RT)
2000 -> (1001, -60 dBm, 0 BH, 0 BP, 0 RT)
1450 ms (726 ms) | 2 sent, 0 lost
1001 -> (2000, -59 dBm, 0 BH, 0 BP, 0 RT)
2000 -> (1001, -60 dBm, 0 BH, 0 BP, 0 RT)
2204 ms (723 ms) | 3 sent, 0 lost
1001 -> (2000, -59 dBm, 0 BH, 0 BP, 0 RT)
2000 -> (1001, -60 dBm, 0 BH, 0 BP, 0 RT)
2958 ms (723 ms) | 4 sent, 0 lost
1001 -> (2000, -59 dBm, 0 BH, 0 BP, 0 RT)
2000 -> (1001, -60 dBm, 0 BH, 0 BP, 0 RT)
Tx: 4, Rx: 4, Lost: 0 (0.0%)
Min: 660 ms, Max: 726 ms, Avg: 708 ms