The factory should deliver cell phone jammer strictly in accordance

Now, with the growing popularity of cell phones, cell phone text messages (SMS) because of its convenience, low-cost and welcomed by people. Especially due to the GSM SMS service through the signaling channel transmission, no dial-up connection, the application of the weather system, GSM-based SMS service can be widely used in meteorological data, meteorological services, to provide weather information for decision making at all levels of leadership . GSM-based mobile messaging platform module with SIM card only, no need to negotiate with operators to replace the cumbersome short message line access, and is currently one of the most extensive communications program. Computers and cell phones are generally using asynchronous serial communication, communication rate of 19200B / S or more, just need to add user information to the appropriate destination address to send Short Message Service Center (SMSC) can, through the service center store and forward to the final letter of accommodation. The factory should deliver  cell phone jammer strictly in accordance with the lead time of  cell phone jammer.
GSM module through the serial port control provided by the AT command set GSM07.05 to achieve, as long as the computer through the serial port to the module can send and receive a series of AT commands to send and receive SMS GSM MODEM control purposes, the AT commands used in Table 1 below. Currently GSM module for SMS control There are three ways to achieve: Block Mode; based on AT commands Text Mode; based on AT command PDU (Protocol Data Unit, Protocol Data Unit) Mode. Block mode handset manufacturers need to provide driver support; send and receive text messages using Text mode, the code is simple, very easy to implement, send text directly on the line, sending non-ASCII content can also be made, but need cell phone support in order to properly display, which limits the Chinese SMS applications; and PDU mode SMS support not only in English, but also send text messages in Chinese, has become the de facto standard, briefly described below PDU mode. The factory should describe the lead time of  china cell phone jammer in a clearer way.
Send and receive SMS PDU mode can use three kinds of coding :7-bit ,8-bit and UCS2. 7-bit encoding used to send normal ASCII characters ,8-bit encoding is used to send data messages, UCS2 encoding for Unicode characters sent. Chinese short messages to achieve the Chinese GB2312 encoding needs to be converted to the Unicode code page CP936 encoding, PDU data format mainly by the short message center address, byte header, message type, destination address, protocol identifier, data coding scheme, period, the length of user data and user data, with data about PDU format and details related to the AT command set, see ETSI GSM07.05 standards. The lead time of cell phone jammer  is included in the instruction of  cell phone jammer .