AT Command Set

5.6 AT+CMGS Send SMS message

Test command

AT+CMGS=?

Execute command

1)If text mode (+CMGF=1): +CMGS=<da> [,<toda>]<CR> text is entered <ctrl-Z/ESC>

2)If PDU mode (+CMGF=0): +CMGS=<length> <CR>

PDU is given <ctrl- Z/ESC>

ESC aborts message

Response

OK

Parameter

Response

TA transmits SMS message from TE to network (SMS-SUBMIT). Message reference value <mr> is returned to TE on successful message delivery. Value can be used to identify message upon unsolicited delivery status re- port result code.

1)If text mode (+CMGF=1) and sending successful:

+CMGS: <mr>[,scts>] OK

2)If PDU mode (+CMGF=0) and sending successful:

+CMGS: <mr>[,ackpdu>] OK

3)If error is related to ME functionality:

+CMS ERROR: <err>

Parameter

<da> GSM 03.40 TP-Destination-Address Address-Value field in string format; BCD numbers (or GSM default alphabet characters) are converted into characters; type of address given by <toda>

<toda> GSM 04.11 TP-Destination-Address Type-of-Address octet in in- teger format (when first character of <da> is + (IRA 43) default is 145, otherwise default is 129)

<length> integer type value indicating in text mode (+CMGF=1) the length of the message body <data> (or <cdata>) in characters; or in PDU mode (+CMGF=0), the length of the actual TP data unit in octets (i.e. the RP layer SMSC address octets are not counted in the length)

In text mode, the maximum length of an SMS depends on the used coding scheme: It is 160 characters if the 7 bit GSM coding scheme is used, and 140 characters according to the 8 bit GSM coding scheme.

<mr> GSM 03.40 TP-Message-Reference in integer format

<scts> GSM 03.40 TP-Service-Centre-Time-Stamp in time-string format (refer <dt>)

<dt> GSM 03.40 TP-Discharge-Time in time-string format: “yy/MM/ dd,hh:mm:ss±zz”, where characters indicate year (two last digits), month, day, hour, minutes, seconds and time zone. For example, 6th of May 1994, 22:10:00 GMT+2 hours equals “94/05/06,22:10:00+08”

<ackpdu>GSM 03.40 RP-User-Data element of RP-ACK PDU; format is same as for <pdu> in case of SMS, but without GSM 04.11 SC address field and parameter shall be enclosed in double quote characters like a normal string type parameter

<pdu> For SMS: GSM 04.11 SC address followed by GSM 03.40 TPDU in hexadecimal format: ME/TA converts each octet of TP data unit into hexadecimal numbers containing two IRA characters (e.g. octet with integer value 42 is presented to TE as two characters 2A (IRA 50 and 65)). In the case of CBS: GSM 03.41 TPDU in hexadecimal format.

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Siemens MC35 manual AT+CMGS Send SMS message, At+Cmgs=?, +CMGS mr,scts OK, +CMGS mr,ackpdu OK
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MC35 specifications

The Siemens MC35 is a compact and versatile modem designed primarily for mobile communication, data transmission, and machine-to-machine (M2M) applications. Launched in the early 2000s, it quickly became popular due to its blend of performance, reliability, and ease of integration, making it a solid choice for developers and businesses.

One of the key features of the MC35 is its support for GSM and GPRS technologies. This allows it to connect seamlessly to various networks, enabling users to transmit data at speeds that were impressive for its time. The GPRS capability can offer data rates of up to 171.2 kbps, allowing for efficient data transfer even in areas with limited connectivity.

The MC35 is designed to support both SMS and voice functionalities, making it adaptable for a range of applications. This includes remote monitoring, telemetry, and alarm signaling. The ability to send and receive SMS messages is a significant advantage for applications that require immediate alerts and notifications, enhancing its utility in security systems and industrial automation.

Furthermore, the modem is equipped with a range of interfaces, including serial communication (RS232), which makes it compatible with various hardware devices. This facilitates easy integration into existing systems, whether for industrial machinery or consumer electronics. Additionally, it features a robust software development kit (SDK), which enables developers to create custom applications tailored to their specific requirements.

Power consumption is another notable characteristic of the Siemens MC35. It is engineered to be energy-efficient, which is especially important for battery-operated devices or systems that require a prolonged operation without frequent recharging or maintenance.

In terms of physical characteristics, the MC35 is compact and lightweight, allowing it to fit into various enclosure designs without occupying much space. Its durability ensures it can perform reliably in different environments, making it suitable for outdoor and industrial applications.

To summarize, the Siemens MC35 stands out as a reliable modem with a rich feature set that includes GSM and GPRS support, SMS and voice capabilities, easy integration through various interface options, and energy-efficient operation. Its adaptability makes it a valuable tool for a wide array of communication and data transmission tasks, solidifying its place in the evolution of mobile communications technology.
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