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Summary of Contents for Quectel GSM UART Port
- Page 1 Quectel Cellular Engine GSM UART Port Application Note GSM_UART_Application_Note_V1.0...
- Page 2 GSM_UART_Application_Note_V1.0 General Notes Quectel offers this information as a service to its customers, to support application and engineering efforts that use the products designed by Quectel. The information provided is based upon requirements specifically provided to Quectel by the customers. Quectel has not undertaken any independent search for additional relevant information, including any information that may be in the customer’s possession.
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Page 3: Table Of Contents
GSM UART Port Application Note Contents Contents ............................2 0. Revision history ..........................5 1. Introduction ........................... 6 2. Connection ............................ 7 3. Level Shifter ..........................8 3.1. Communicate with DTE ...................... 8 3.2. Communicate with the RS-232 port of PC ................9 4. - Page 4 GSM UART Port Application Note Table Index TABLE 3: LOGIC LEVELS OF THE UART PORT ................8 TABLE 2:THE VOLTAGE OF RS-232 ....................9 TABLE 3: RI RESPONSES ........................14 TABLE 4: AT+QINDRI INDICATES RI WHEN USING URC ............15 GSM_UART_Application_Note_V1.0...
- Page 5 GSM UART Port Application Note Figure Index FIGURE 1: CONNECTING TXD AND RXD ..................7 FIGURE 2: CONNECTING ALL SIGNALS................... 7 FIGURE 3: THE REFERENCE LEVEL SHIFTER BY USING OPEN DRAIN OUTPUT BUFFER ..8 FIGURE 4:THE REFERENCE LEVEL SHIFTER BY USING BIPOLAR TRANSISTOR ....9 FIGURE 5:THE REFERENCE LEVEL SHIFTER BY USING SP3238E FOR COMMUNICATING WITH PC ............................
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Page 6: Revision History
GSM UART Port Application Note 0. Revision history Revision Date Author Description of change 2009-06-25 Jay XIN / Ken JI Initial GSM_UART_Application_Note_V1.0 - 5 -... -
Page 7: Introduction
GSM UART Port Application Note 1. Introduction This document describes the UART port of Quectel GSM module and how to use it in customer’s application design. This document can help you quickly understand the UART port of the module. Note: AT command can be input through UART port only after module is powered on and the Unsolicited Result Code “RDY”... -
Page 8: Connection
GSM UART Port Application Note 2. Connection Data Terminal Equipment (DTE) communicates with the module through its main UART port. The voltage level of UART port interface is 2.8 Volts. If the voltage level of DTE’s UART pins doesn’t match with the module, level shifter circuit should be inserted. , The UART pins include TX data (TXD), RX data (RXD), Request To Send (RTS), Clear To Send (CTS), Data Terminal Ready (DTR). -
Page 9: Level Shifter
GSM UART Port Application Note 3. Level Shifter Normally, the voltage of VDD_EXT is 2.8V and the DC characteristics of UART port are listed in Table 3. Table 1: Logic levels of the UART port Symbol Unit 0.67 VDD_EXT+0.3 0.34 VDD_EXT NOTE: If the voltage level of UART pins in DTE and the module doesn’t match with each... -
Page 10: Communicate With The Rs-232 Port Of Pc
GSM UART Port Application Note Figure 4 :The reference level shifter by using bipolar transistor 3.2. Communicate with the RS-232 port of PC Table 2:The voltage of RS-232 Logic level Transmitter capable Receiver capable Unit Logic 0 +5~+15 +3~+25 Logic 1... -
Page 11: Firmware Upgrade
GSM UART Port Application Note 4. Firmware Upgrade To upgrade module firmware in the future, it is strongly recommended to reserve a connector of 4-pin (RXD, TXD, PWRKEY, GND). NOTE: 1. Please reserve a 4-pin connector on customer’s board for firmware upgrade. -
Page 12: Figure 6: The Connection For Firmware Upgrade
GSM UART Port Application Note Figure 6: The connection for firmware upgrade GSM_UART_Application_Note_V1.0 - 11 -... -
Page 13: Flow Control
GSM UART Port Application Note 5. Flow control Flow control is essential to prevent loss of data or avoid errors when, in a data or fax call, the sending device is transferring data faster than the receiving side is ready to accept. When the receiving buffer reaches its capacity, the receiving device should be capable to cause the sending device to pause until it catches up. -
Page 14: Control Signals
GSM UART Port Application Note 6. Control Signals 6.1. DCD The DCD pin will be active (low) after establishing a data connection. When the data connection is turned off, the DCD pin will go to inactive (high) 6.2. DTR The module would automatically go into SLEEP mode, if the DTR is set to high level, the slow clocking mode is already enabled by AT+QSCLK, and there is no specific task for the module to handle. -
Page 15: Table 3: Ri Responses
GSM UART Port Application Note will be returned to indicate the command mode. Note: AT&D1 is volatile. Executing AT&W to save this profile if necessary. 6.3. RI If the module acts as a caller, the RI pin would keep to high. On the other hand, if the... -
Page 16: Table 4: At+Qindri Indicates Ri When Using Urc
GSM UART Port Application Note Figure 8: Behaviours of RI Table 4: AT+QINDRI Indicates RI when using URC AT command Response Parameter Read command +QINDRI: <status> See set command AT+ QINDRI? Set Command <status> AT+ QINDRI=<status> 0 on 1 off It is recommended to connect the RI pin to an interrupt pin of Host MCU, as the RI indication can be used to wake up the MCU from power saving mode. - Page 17 Shanghai Quectel Wireless Solutions Co., Ltd. Room 501, Building 13, No.99, Tianzhou Road, Shanghai, China 200233 Tel: +86 21 5108 6236 Mail: info@quectel.com...
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