U-Link TRx User Guide
Ref.
09-03-V1.0
p
5
Operating modes
Two operating modes are available:
1-
Command mode (usage of AT commands)
2-
Normal mode (Serial data are transmitted on radio link)
At power up the UHF radio device is in normal mode: it is able to send or receive data to or from the radio link according to its
current parameter configuration.
Command mode
The command mode is used to read and update the UHF radio configuration registers using AT command. In command mode
the UHF receiver or transmitter is inhibited (Rx and Tx), excepted when using test command.
Entering command mode: issues on the serial link a +++ sequence. The sequence of three conse characters is
accepted only if no character have been sent before and after the +++ sequence. Register S214 defines the silence duration.
Exiting command mode (return into normal mode): send the serial command ATO<cr>
Normal mode
At power on the UHF transceiver is in normal mode, and is ready for receiving data or transmitting data.
+
+
+
Transceiver mode
Command mode
S214
duration
S214
duration
