D T 5 0 - M C O M M A N D R E F E R E N C E G U I D E 1 . 1 P a g e
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1 Introduction
2 Data Mode and AT Mode
The DT50 can be in two different modes AT mode and data mode. It starts in data mode and can be
requested to move to AT mode by sending an escape sequence. The default escape sequence consists of
three consecutive
“
/
”
( /// ). The escape sequence character can be changed using the ATS2 command.
In AT mode the DT50 will respond to AT programming commands.
Note: If the module is restored to factory default settings, the escape sequence will be reset to three
consecutive “+” (+++). To ensure compatibility a
cross device revisions you will need to reconfigure the
DT50 using the following command sequence
ATS2=47
AT+UMSM=1
AT&W
AT+CPWROFF
The following criteria must be met for the DT50 to interpret the sequence as a valid escape sequence:
Before the escape sequence there must be silence for 1 second.
After the escape sequence there must be silence for 1 second.
The entire escape sequence must be sent within 200 ms.
To move from AT mode to data mode, use the "ATO1" command
3 Default Serial Settings
The DT50 does not support auto baud rate. The baud rate is set using the "Write RS232 Settings"
(AT+UMRS) command. The default RS232 settings are 115200 bits/s, 8 data bits, no parity, 1 stop bit,
and CTS/RTS flow control.
4 AT Commands Over Bluetooth
It is possible to configure and control a remote DT50 via Bluetooth using AT commands. Criteria for
using AT commands over Bluetooth:
