User manual - Seeed Studio
Contents
1. Send AT RX to module And the module returns U1 r nB9600 r nC001 r nA000 r nP8 r n 12 AT U Set data check bit and stop bit of serial port communication N No check O odd E even 1 Stop bit 2 two bites 3 1 5 bits e g To set serial port format to odd check and two stop bits Send AT U02 to module And the module returns OK U02 WWW SEEEDSTUDIO COM W SEEED 13 AT V Return version information e g Send AT V to module And the module returns HC 11_V1 3 14 AT SLEEP After receiving the command the module enters sleep mode after exiting from AT and this mode doesn t allow serial port data transmission Then enter AT again and the module will exit from sleep mode automatically Current consumption of sleep mode is 20uA This command is available from V1 8 e g When it s not needed to transmit data to save power Send AT SLEEP to module And the module returns OK 15 AT RESET Set serial port channel and address to be default value e g Send AT RESET to module And the module returns RESET OK 16 AT IV Return version of internal update code of module This command is available from V1 9 e g Send AT IV to module And the module returns I1 17 AT UPDATE Put the module in the status of waiting for software update After sending the command the module will not respond to command any more until it is re energized Af2. F means function and U means UART This command is available from V1 8 e g To set the module to be wireless serial port transparent transmission mode Send AT FU1 to module And the module returns OK FU1 8 AT GDPCxAx This command has been invalid Obtain IO status of remote module Only when remote module is changed by command AT FCMF can reading succeed CxAx is remote module channel and address such as COO1A003 Among the returned information 3 4 and 5 means Pin 3 4 and 5 H means level and L means low level When reading fails the module returns Fail e g Send AT GDPC001A000 to module And the module returns GDPC001A000 3H 4L 5H Fail WWW SEEEDSTUDIO COM W SEEED 9 AT Px Set transmitting power of module x is optional from 1 to 8 respectively representing 30dBm 20dBm 15dBm 10dBm 0dBm 5dBm 7dBm and 10dBm and the default is 8 namely 10dBm e g Send AT P6 to module And the module returns OK P6 10 AT Ry Obtain module parameters y is any letter among B A C and P respectively representing baud rate address channel and transmitting power Example 1 Send AT RB to module And the module returns B9600 Example 2 Send AT RA to module And the module returns A001 11 AT RX Obtain all common parameters of module Return serial port mode baud rate channel address and transmitting power in order X is capital e g
3. 4 and 5 of the former module only respond to falling edge the level of corresponding pins of latter module will be turned over from 0 to 1 or from 1 to 0 The level of controlled module is 0 when it is just energized WWW SEEEDSTUDIO COM W SEEED VI Application Circuit Figure I Connection between Serial Port Module HC 11 and Computer Serial Port Rx R5232 GND OUTI 14 Rx RS232 13 Tx RS232 ES Y DNI DOUT DN a Sa RIN2 ROUT2 Figure II Connection between Wireless Serial Port Module HC 11 and Single Chip Microcomputer 3 3V 6V MCU_TXD MCU RND HC 11 MCU ki The connection of Pin 5 can be removed if WWW SEEEDSTUDIO COM W SEEED Figure IV Simple Test of Wireless IO Control Send AT FCMF or AT FCMT to change to be wireless IO controller HC 11 Send AT FCSF or AT FCMT to change to be IO controlled E Sl S2 and S3 correspond to mode control Dl D2 and D3 respectively 3 3V 6V For example press 3 and D3 will be lit on release S3 and D3 will be lit off the situation of FCxT is press and release it and the light will be lit on then press and release it again and the light will be lit off 3 3V 6V WWW SEEEDSTUDIO COM W SEEED Figure V One Master Multi slave Communication Method When MCU master sends serial port data add a byte of slave number before the data After receiving serial port data the slave will judge whether the first byte
4. ERAM SERIER SR RACER H ERP AATA Ga E eg VE SH VOC AM GND Ground RXD TTL level input port TXD TTL level output port CON Parameter setting control pin valid for low level ANTI POB antenna pedestal ANT2 Antenna solder eye WWW SEEEDSTUDIO COM W SEEED II Wireless Serial Port Transparent Transmission Module Function Use Diagram Half duplex Module replaces wire and becomes wireless communication Module Module 1 Simple description of working principle When the device on the left of the above figure sends serial port data to module and the RXD port of the left module receives the serial port data it will automatically send the data in the air by means of radio wave The right module can automatically receive the data and restore from TXD the serial port data originally sent by the left device It is the same from right to left 2 Characteristics of serial port transparent transmission The module has four types of serial port transparent transmission modes this function is valid from V1 8 expressed from FU1 to FU4 All modes are only responsible for receiving and sending serial port data rather than wireless transmission and are very convenient to use Each mode has respective characteristics and details can be seen in the next sub section The default mode is FU1 mode compatible with the previous versions Different modes cannot transmit data to each other User could select the optimal
5. mode according to practical circumstances The modules are usually used in pairs and transmit data by means of half duplex full duplex is available for FU3 mode The baud rate communication channel and address of two paired modules shall be set to be the same Modules of different serial port modes channels and addresses cannot transmit data to each other Use the number of bytes continuously sent to serial port of module unlimited to one time except for FU2 mode However considering ambient interference if thousands of data size is sent continuously at a time some number of bytes may be lost WWW SEEEDSTUDIO COM microcontroller W SEEED Working voltage of module is 3 3V 6V and it can be directly connected to serial port of 3V 5V The default parameters of modules are shown in the table below Parameter name Baud rate of Module address Communication Transmitting serial port channel power Parameter value 9 600 8 bit data 000 001 P8 10dBm without check one stop bit After entering command mode serial port transparent transmission function will not be valid Then the serial port is used to receive the command to change parameters Parameter change can be seen in Part II Command Instruction 3 Interpretation of serial port transparent transmission mode FU1 mode It is default mode of module fully compatible with V1 7 Its current is 3 4mA FU2 mode The idle current which means t
6. 5mA FU2 80uA FU3 22mA FU4 22mA FCxx 3 5mA Idle means that the module receives neither serial port data nor wireless data The maximum peek value is 35mA in the state when module receives serial port data or wireless data 2 Current consumption in wireless IO control mode When IO port does not provide current for outside the current is 3 5mA
7. WWW SEEEDSTUDIO COM MW SEEED HC 11 434MHz Wireless Serial Port Module E ppa 4 m A AS c 1 Key Words Half duplex 80uA Idle Current Number of Bytes Transmitted Unlimited to One time Document No 20130910 WWW SEEEDSTUDIO COM W SEEED Table of Contents Beier EN are er le EE 3 II Wireless Serial Port Transparent Transmiseton non nonn non nonn cnn nonn cnn non n cnn nnn noia 4 TH Comm E E 7 Ke E 11 Y Wireless 1O Function 247 ii ii is 12 NL Application Cc e Eed 13 VII Electrical OCharactertstpcs nono on cnn n none rn nro nnonn non n on nro n none rn nro nrrnnrnnoos 17 Kat fe LEE e 17 Attachment Module Historyssa innana A tue e EE 17 WWW SEEEDSTUDIO COM W SEEED I Module Introduction HC 11 wireless communication frequency band is 434M Multiple types of serial port transparent transmission modes have respective features and the mode is changed by command V1 8 User needn t program the modules and four modes are only responsible for receiving and sending serial port data and are convenient to use Low current consumption the idle current is 80HA 3 5mA or 22mA depending on the selected mode The number of bytes sent to serial port of module unlimited to one time All functions and parameters are changed by command and can be saved in case of power failure HC11 Pin Definition IIe SS Lt AAA KE RRA 27 Om 14 Amx Am PGK TERIER RIEREPENIARZOA Ik APB RREAN rat A
8. arameters cannot be restored to the default value and the module only enters AT mode When exiting from the mode the module will switch to the status modified by the command 2 Command instruction 1 AT Test command e g Send AT to module And the module returns OK 2 AT A WWW SEEEDSTUDIO COM WY SEEED Change the module address optional between 000 and 255 and it will be valid after exiting from AT mode The default value is 000 e g To set module address to be 012 Send AT A012 to module And the module returns OK A012 3 AT B Change the serial port baud rate and it will be valid after exiting from AT mode The baud rate can be set to be 1 200 2 400 4 800 9 600 19 200 38 400 57 600 and 115 200 The default value is 9 600 When using 115 200 continuously sending serial port data is not supported and at most 245 bytes can be sent at a time e g To set serial port baud rate of module to be 19 200 Send AT B19200 to module And the module returns OK B19200 4 AT C Change wireless communication channel of module optional from 001 to 127 and the default value is 001 0 cannot be omitted If this value is too high data might not be received and about 20 channels are actually available namely from 001 to 020 e g To set module channel to be 015 Send AT C015 to module And the module returns OK C015 5 AT Eyx This command is used to set remote mo
9. connecting method is E H WWW SEEEDSTUDIO COM W SEEED V Wireless IO Function Module can be set to be wireless IO control function through command For the module set to be controller AT FCMF command setting its Pins 3 4 and 5 can be directly connected to negative and positive terminals of power supply to control the level status of corresponding pin of remote module For the module set to be controlled driving capability of its Pins 3 4 and 5 is When the output is high and is forced to be low the current of pin to ground is 18mA When the level is low Pins 3 4 and 5 are connected to ground through an 180R resistance Pay attention to reducing the output current of IO port as much as possible and if the output current is extremely high normal work of module cannot be ensured This function has two working modes level following and level turnover Level following One module sends AT FCMF and the other module sends AT FCSF After these commands are set the pin level value of latter module FCSF will keep consistent with that of former module FCMF all along For the former module the interval between two level jumps of IO port shall be at least 50mS and of course this time can be ignored if the module is connected to a button Level turnover When the command is modified one module sends AT FCMT the other module sends AT FCST and they can work in level turnover mode When falling edge appears to Pins 3
10. dule When remote module enters AT mode the parameter y will be changed to x and it will be valid after exiting from AT mode y is one among BAC respectively representing baud rate address and channel x value can be seen in the instruction of commands Bx Ax and Cx The meaning of returned value is as follows EyE parameter error EyR set correctly EyF command error Fail connection failure E means external Example 1 Set remote module address to be 050 Send AT EA050 to module And when the remote module enters AT mode the module returns EAR otherwise it returns Fail WWW SEEEDSTUDIO COM W SEEED Example 2 Send AT EB4800 to module And the module returns EBR 6 AT FCyy Set module to be wireless IO control See wireless IO part The first parameter y can select M controller S controlled The second parameter y can select F follow T turnover It will be valid after exiting from AT mode e g One module sends AT FCMT to set to controller remote controller And the other module sends AT FCST to set to be controlled 7 AT FUx Set module to be wireless serial port function The value of x is optional within 1 4 Characteristics of mode can be seen in Part II above It will be valid after exiting from AT mode The default of module is serial port function Only when serial port function mode of two modules is set to be the same can normal communication be available
11. hat no serial port data are received and sent of this mode is only 80uA averagely but the time delay is very long close to 400mS In this mode the baud rate of serial port can only be 4 800 2 400 or 1 200 Due to its long time delay when sending serial port data to module continuously at most 245 bytes can be sent at a time Owing to its very low current consumption this mode is suitable to low power application FU3 mode Its idle current is 23mA much more than that of FUI and FU2 but its transmission time delay is reduced to be below 10mS Accelerate question and answer application mode FU4 mode V1 8 The lower the baud rate of serial port is the farther the transmission distance is but the transmission time delay will be lengthened Compared with the other three modes its transmission distance is farther In FU4 mode when the baud rate of serial port is set to be below 9 600 although the transmission distance is far the transmission time delay will be much increased In question and answer application one round trip takes more than 300mS WWW SEEEDSTUDIO COM The following gives some reference values of various modes V1 8 W SEEED Mode FUI FU2 FU3 FU4 Remark Idle current 3 5mA 80uA 22mA 22mA Average value Transmission 20mS 380mS 2mS 7 mS Sending one time delay byte Loopback test 31mS 8mS 22mS Serial port time delay 1 baud rate 9 600 sending one byte Loopback test 31mS 18mS 40mS Serial
12. of data is its number and if the first byte is its number make response and reply to the master otherwise make no action MCU_ master HC 11 To communicate with slave 1 add 1 before serials port data and to communicate with slave 2 add 2 HC 11 MCU _ slave 1 After receiving serial port data if slave 1 finds that the number before data is 1 process it and send it back to the master HC 11 MCU_ slave 2 e After receiving serial port data if slave 2 finds that the number before data is 2 process it and send it back to the master HC 11 MCU_ slave 3 The same as slave 1 and slave 2 WWW SEEEDSTUDIO COM W SEEED Figure VI Combined Use of Bluetooth Module and 434M Wireless Module Bluetooth Wireless Single chip module microcompu device HC11 or HC12 ter EN ri Mobile phone o port tablet PC etc f Ix Ix Rx Rx Gud m Gnd Bluetooth module Wireless HC05 06 etc module HC11 or HC12 Abs Tx Rx Rx Chul Chul This use method can increase the wireless communication distance between mobile phone and single chip microcomputer to be 50m WWW SEEEDSTUDIO COM W SEEED VII Electrical Characteristics Test power voltage is 3 32V The following measured data are average values The peek current is 35mA 1 Current consumption in wireless serial port function mode Idle current in different function modes HUT 3
13. port time delay 2 baud rate 9 600 sending ten bytes Note Loopback test time delay means the duration from the time of after conducting short circuit on TX and RX pins of one module and sending serial port data to the other module starting to send serial port data to the other module to the time that the returned data appear at TX pin of the other module WWW SEEEDSTUDIO COM W SEEED HI Commands Command is used to set the module parameters and switch the module functions and modification of parameters and functions will not be lost in case of power failure 1 Command mode entering 1 Wireless serial port function command mode entering The first way to enter in normal use energized put Pin 5 in low level pull down The second way to enter disconnect power supply first put Pin 5 in low level then energize it again and 1S later enter the command mode Either of the above two ways can make the module enter AT command mode release not put in low level and exit from the command mode If the module function is changed it will be switched to corresponding functional status While the second way is different and in V1 7 and previous versions all parameters can be restored to the default values and in V1 8 the module enters AT in the serial port format of 9 600 N 1 constantly 2 Wireless IO control function command mode entering Only the second way can be used to enter the mode but the p
14. ter serial port assistant sends this command close the serial port select file in HC11 updater and open the serial port Then the module can update software version WWW SEEEDSTUDIO COM W SEEED IV Precautions 1 If the distance between two modules is very close less than 0 5m it would be better that the transmitting power of two modules are set to be low e g P1 P3 Otherwise receiving will be saturated and communication between modules will fail If the distance is only several centimeters communication cannot be ensured even more 2 Don t connect LED between TX line of module and power end to increase resistance Otherwise serial port communication of module will be affected 3 The following circumstances usually can be ignored and they shall be noticed when using dynamic parameters of microcontroller MCU 1 After the device sends the serial port data of last byte to module only after more than 28mS can the operation performance of entering AT mode be valid 2 After lowering and connecting Pin 5 command is sent to module only after 30mS After pulling up Pin 5 module can work normally only after 50Ms 4 Except when entering command mode CON PIN 5 cannot be connected to low level at the early stage of energizing resetting in other work mode e g in the connecting method as shown in the figure below IIH When energizing and working the module will go to command mode to work So the correct
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