MTX -3G-JAVA series User Manual page 48

In addition, the modem control signals DTR, DSR, DCD and RING are available. The MODEM control
RING signal (Ring Indication) can be used to indicate, to the cellular device application, that an
incoming call or Unsolicited Result Code (URC) is received. It can also be used to send pulses to the
host application; for example, to wake the application up from the power saving mode.
The DB9 connector pinout is shown in the table below:
Pin Signal
1 DCD
2 RD 0
3 TD 0
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Features

Includes the data lines TXD0 and RXD0, the status lines RTS0 and CTS0 and also the modem
control lines DTR0, DSR0, DCD0 and RING0.

ASC0 is primarily designed for controlling voice calls, transferring CSD, fax and GPRS data and
for controlling the GSM engine with AT commands.

Full Multiplex capability allows the interface to be partitioned into three virtual channels, but
with CSD and fax services only available on the first logical channel. Please note that when
the ASC0 interface runs in Multiplex mode, ASC1 cannot be used.

The DTR0 signal will only be polled once per second from the internal firmware of MTX‐3G‐
JAVA.

The RING0 signal serves to indicate incoming calls and other types of URCs (Unsolicited
Result Code). It can also be used to send pulses to the host application; for example, to wake
the application up from the power saving mode. To configure the RING0 line, use the
following AT Command: AT^SCFG.

The default configuration is 8 data bits, no parity and 1 stop bit. The setting can be changed
using the AT command AT+ICF and, if required, AT^STPB.

ASC0 can be operated at fixed bit rates from 1200bps to 921600bps.

The default serial speed for MTX‐3G‐JAVA is 115200bps.
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Direction Description
Output Data carrier detected
Output Received data
Input Transmitted data
Input Data terminal ready
‐ Ground connection
Output Data set ready
Input Request to send
Output Clear to send
Output Ring indicator
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MTX M2M® by MATRIX ELECTRONICA S.L.U
MTX‐3G‐JAVA Family
2015/10 v1.6
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