Sony Ericsson GR64 - Manual (Page 58)

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5.11.3.3 Clear To Send (CTS1)
CTS is asserted by the DCE to indicate that the host (DTE) may transmit data. When
CTS is high, the host (DTE) is not permitted to transmit data. The table below shows
the load characteristics for this signal.
5.11.3.4 Data Terminal Ready (DTR1)
DTR indicates that the DTE is ready to receive data. It also acts as a hardware ‘hang-
up’, terminating calls when switched high. The signal is active low. To define the
exact behavior of DTR, use an AT&D command.
5.11.3.5 Data Set Ready (DSR1)
DSR indicates that the DCE is ready to receive data. The signal is active low. To
define the behavior, use an AT&S command.
5.11.3.6 Data Carrier Detect (DCD1)
DCD indicates that the DCE is receiving a valid carrier (data signal) when low. To
define the exact behavior of DCD use an AT&C command
5.11.3.7 Ring Indicator (RI)
RI indicates that a ringing signal is being received by the DCE when low. To define
the exact behavior of RI, use using the AT*E2SMSRI command, which includes the
option of asserting the RI signal to flag an incoming SMS.