Hardware Information
3-198 AT Commands Reference Manual December 31, 2007
+MTCTS, CTS Line Test Command
This command sets the CTS pin of the RS232 to active high, waits one second and then returns
the CTS to active low.
Example
AT+MTCTS
OK
&K, RTS/CTS Flow Control
This command configures the flow control. The RTS (Request To Send) is an input line. The RTS
signal is received from the terminal and a low condition indicates that the G24 can send more
data. The CTS (Clear To Send) is an output line. The CTS signal is sent to the terminal and a low
state indicates that more data can be sent to the G24.
The RTS and CTS together make up what is called RTS/CTS or “hardware” flow control. Both
lines are used when “hardware flow control” is enabled in both the terminal and the G24 devices.
When the terminal is ready and able to receive data, it puts the RTS line in an active (low)
condition to indicate this to the G24. If the terminal is not able to receive data (typically because
its receive buffer is almost full), it puts the RTS line in an inactive (high) condition as a signal to
the G24 to stop sending data. When the terminal is ready to receive more data (for example, after
data has been removed from its receive buffer), it places this line back in the active condition. The
RTS line complements the CTS line. The G24 puts the CTS line in an active condition to tell the
terminal that it is ready to receive the data. Likewise, if the G24 is unable to receive data, it places
the CTS line in an inactive condition.
Command Type Syntax Response/Action
Execute
AT+MTCTS OK
Command Type Syntax Response/Action
Set
AT&K<param> OK
Read
Test
AT&K=? &K: (list of supported
<param>s)
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