User's Manual
U-Link TRx User Guide
Ref. 09-03-V1.0 p 6
AT commands
ThelistofATcommandssupportedbytheUHFradiois:
General commands
Commands Description
Operating mode selection
ATO Return into normal mode
<silence>+++<silence> Command mode activation
Registers management
ATSn ? Displays the Sn register content where n represents the register
number. The response has the following format:
Sn=y<cr><lf>
ATSn=m Set the register value with ‘m’. n represents the register number.
AT&W Saves the new register configuration in EEPROM. Each time you
switch on the modem, the EEPROM configuration will be loaded
in the modem registers
AT/S Displays all register values. The response has the following
format:
Sxxx=y<cr><lf> for each register. The command ends with a
double <CR><LF> sequence.
AT/V Software version display. The response has the following format:
“TRx Magellan : Narrow band 450-470MHz 12.5kHz UHF
transceiver Vxx.yy<cr><lf>”
ATR Restore the register default values. Note that S235 is not restored
by ATR.
Test modes
ATT1 Pure carrier () transmission using current channel. The output of
this mode is achieved by reception of any character on the serial
link.
ATT2 Modulation using current channel. Modulation (55)hex data. The
output of this mode is achieved by reception of any character on
the serial link.
ATT3 Modulation using current channel. Modulation with 512 bits
pseudo random data (DM2), allowing BER evaluation. The output
of this mode is achieved by reception of any character on the
serial link.
Registers description
Type Register Function Description Default
Value
Note
Radio management
R/W S200 Channel table Set channel table -
R/W S201 Channel number Select radio channel from the table:
From 0 up to 15
10
R/W S204 Preamble duration Preamble duration unit in ms:
From 10 to 100
40
R/W S217 Serial Time out for
radio
Serial timeout before starting radio
transmission, unit ms.
From 3 up to 240
3
R/W S231 RF out level Adjust the RF output level
0Æ 500mW (27dBm)
1Æ 2W (33dBm)
2 Æ 4W (36dBm)
2
R/W S250 Receiver Frequency
BW
Indicates the bandwidth adjustment of
the helical receiver filters. Format is
460.0125
000.00
00