User manual - Seeed Studio
Contents
1. x value 1 2 3 4 5 6 7 8 Transmitting 1 2 5 8 11 14 17 20 power of module dBm WWW SEEEDSTUDIO COM WY SEEED The default value is 8 and the higher the transmitting power is the farther the communication distance is When the transmitting power level is set to be 1 the transmitting power is the minimum Generally speaking every time the transmitting power is reduced by 6dB the communication distance will be reduced by half e g Send AT P5 command to module and the module returns OK P5 After exiting from the command code the transmitting power of module is 11dBm AT Ry Obtain single parameter of module y is any letter among B C F and P respectively representing baud rate communication channel serial port transparent transmission mode and transmitting power Example 1 Send AT RB to module and if the module returns OK B9600 it is inquired that the serial port baud rate of module is 9 600bps Example 2 Send AT RC command to module and if the module returns OK RC001 it is inquired that the communication channel of module is 001 Example 3 Send AT RF command to module and if the module returns OK FU3 it is inquired that the module is working in serial port transparent transmission mode 3 Example 4 Send AT RP command to module and if the module returns OK RP 20dBm it is inquired that the transmitting power of m2. Parameter Setting AT Command AT command is used to set the module parameters and switch the module functions and after setting it will be valid only after exiting from setting state Meanwhile modification of parameters and functions will not be lost in case of power failure 1 Command mode entering The first way to enter in normal use energized put Pin 5 SET in low level The second way to enter disconnect power supply first put Pin 5 Set in low level and then energize it Either of the above two ways can make the module enter AT command mode release it not put pin SET in low level and exit from the command mode If the module function is changed after exiting from command mode it will be switched to corresponding functional status In the second way the module enters AT in the serial port format of 9 600 N 1 constantly 2 Command instruction AT Test command WWW SEEEDSTUDIO COM W SEEED e g Send AT command to module and the module returns OK 2 AT Bxxxx Change the serial port baud rate The baud rate can be set to be 1 200bps 2 400bps 4 800bps 9 600bps 19 200bps 38 400bps 57 600bps and 115 200bps The default value is 9 600bps e g To set serial port baud rate of module to be 19 200bps first send AT B19200 command to module and the module returns OK B19200 AT Cxxxx Change wireless communication channel optional from 001 to 127 for th
3. STUDIO COM W SEEED Product Dimension 27 4mm 1 3mm 14 4mm 2 54mm Definition of Pins rig EE RFIC MCU g Tum nani P sTMes 27 8mm s MMM OEA 1 55mm AN 2 54 8 04mm 2 12mm HC 12 module can adopt patch welding or weld 2 54mm spacing pin header and directly insert it onto user s PCB The module totally has nine pins and one RF antenna pedestal ANT1 and their definitions are as shown in the table below Pin Definition V O direction Note 1 VCC Power supply input DC3 2V 5 5V with load capacity not less than 200mA Note If the module is working in transmitting state for a long time it is suggested that one 1N4007 diode should be connected in series when the power voltage is greater than 4 5V to avoid heating of built in LDO of module GND Common ground WWW SEEEDSTUDIO COM 3 RXD W SEEED Input weak pull up URAT input port TTL level 1k resistance has been connected in series inside TXD Output URAT output port TTL level 1k resistance has been connected in series inside SET Input internal 10k pull up resistance Parameter setting control pin valid for low level lk resistance has been connected in series inside ANT Input output 433MHz antenna pin GND Common ground GND Common ground OIII NC No connection used in fixing compati
4. WWW SEEEDSTUDIO COM W SEEED HC 12 Wireless Serial Port Communication Module User Manual V1 1 Product Application Wireless sensor Community building security Robot wireless control Industrial remote control and telemetering Automatic data acquisition Container information management POS system Wireless acquisition of gas meter data Vehicle keyless entry system PC wireless networking WWW SEEEDSTUDIO COM W SEEED Product Features Long distance wireless transmission 1 000m in open space baud rate 5 000bps in the air Working frequency range 433 4 473 0MHz up to 100 communication channels Maximum 100mW 20dBm transmitting power 8 gears of power can be set Three working modes adapting to different application situations Built in MCU performing communication with external device through serial port The number of bytes transmitted unlimited to one time Update software version through serial port Product Introduction HC 12 wireless serial port communication module is a new generation multichannel embedded wireless data transmission module Its wireless working frequency band is 433 4 473 0MHz multiple channels can be set with the stepping of 400 KHz and there are totally 100 channels The maximum transmitting power of module is 100mW 20dBm the receiving sensitivity is 117dBm at baud rate of 5 000bps in the air and the communication distance is 1 000m in open space The module is encapsulated wi
5. ble with HC 11 module pin position ANTI ANT Input output IPEX20279 001E 03 antenna socket ANT2 ANT Input output 433MHz spring antenna solder eye Pints 1 6 have two bonding pads respectively and the outer half hole bonding pad is used in patch welding When the inner bonding pad ANT2 of Pin 6 is used in patch welding the spring antenna can be welded with hands The inner round hole bonding pads of Pins 1 5 are used to weld 2 54mm spacing pin header and can be directly inserted onto user s PCB socket Wireless serial port transparent transmission 1 Simple introduction of working p principle WWW SEEEDSTUDIO COM WY SEEED MERU ELE WE Module replaces wire and becomes wireless y PU BL th HC 12 t 2 HC 12HER As shown in the above figure HC 12 module is used in physical wiring when replacing half duplex communication The left device sends serial port data to module and after RXD port of left module receives the serial port data it will automatically send the data into the air via 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 Only half duplex state is available between modules and they cannot receive and send data at the same time 2 Serial port transparent transmission HC 12 module has three serial port transparent transmission modes expressed
6. de to be default value e g Send AT DEFAULT to module and the module returns OK DEFAULT and the default vale is restored The serial port baud rate is 9 600bps communication channel is C001 and serial port transparent transmission mode is FU3 12 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 After sending the command please close the serial port assistant and turn on HC 1X updater to update the software For detailed operating method please refer to the following software update introduction
7. e wireless channel exceeding 100 the communication distance cannot be ensured The default value of wireless channel is 001 and the working frequency is 433 4MHz The channel stepping is 400KHz and the working frequency of Channel 100 is 473 0MHz e g To set the module to work at Channel 21 first send AT C021 command to the module and the module returns COK C021 After exiting from the command mode the module will work at Channel 21 and the working frequency is 441 4MHz Note As the wireless receiving sensitivity of HC 12 module is relatively high when the serial port baud rate is greater than 9 600bps five adjacent channels shall be staggered to use When the serial port baud rate is not greater than 9 600bps in short distance within 10m communication also five adjacent channels shall be staggered to use 4 AT FUx Change serial port transparent transmission mode of module and three modes are available namely FU1 FU2 and FU3 The default mode of module is FU3 and only when serial port transparent transmission mode of two modules is set to be the same can normal communication be available For detailed introduction please see the above wireless serial port transparent transmission e g Send AT FU1 to module and the module returns AT 0K AT Px Set transmitting power of module x is optional from 1 to 8 and the corresponding transmitting power of module is as shown below
8. n this mode the module can automatically adjust the baud rate of wireless transmission in the air according to serial port baud rate and the corresponding relationship is as shown in the table below Seri 1 200b 2 400b 4 800b 9 600b 19 200b 38 400b 57 600b 115 200b al ps ps ps ps ps ps ps ps port bau d rate Bau 5 000bps 15 000bps 58 000bps 236 000bps d rate in the air To get the farthest communication distance the serial port baud rate can be set to be low For short time transmission of mass data set the serial port baud rate to be high but the communication distance will be reduced accordingly The receiving sensitivity of module at different baud rates in the air is as shown in the table below Baud rate in 5 000bps 15 000bps 58 000bps 236 000bps the air Wireless 117dBm 112dBm 107dBm 100dBm receiving sensitivity Generally every time the receiving sensitivity is reduced by 6dB the communication distance will be reduced by half When SET pin of module is at low level the serial port transparent transmission mode can be set through AT command see the introduction in the following chapter for details FU1 mode is relatively power saving mode and the idle working current of this mode is about 3 6mA In this mode the module can also set eight types of serial port baud rate as shown in the above table but the baud rate in the air i
9. odule is 20dBm AT RX Obtain all parameters of module Return serial port transparent transmission mode serial port baud rate communication channel and transmitting power in order e g Send AT RX command to module and the module returns OK FU3 r n OK B9600 r n OK C001 r n OK RP 20dBm r n r n means return newline 8 AT Uxxx Set data bits check bit and stop bit of serial port communication For check bit N means no check O means odd check and E means even check For stop bit 1 means one stop bit 2 means two stop bits and 3 means 1 5 stop bits e g To send serial port format to be eight data bits odd check and one stop bit please Send AT U801 to module and the module returns OK U801 AT V Inquire firmware version information of module e g Send AT V command to module and the module returns HC 12_V1 1 WWW SEEEDSTUDIO COM WY SEEED AT SLEEP After receiving the command the module enters sleep mode after exiting from AT the working current is about 224A and this mode doesn t allow serial port data transmission Then enter AT setting state again and the module will exit from sleep mode automatically e g When wireless data transmission is not needed to save power send AT SLEEP command to module and the module returns OK SLEEP AT DEFAULT Set serial port baud rate communication channel and serial port transparent transmission mo
10. s uniform 250 000bps FU2 mode is power saving mode and the idle working current of this mode is about 80uA In this mode the module only supports baud rates of 1 200bps 2 400bps and 4 800bps and the baud rate in the air is uniform 250 000bps If the module is set to be other serial port baud rate the module cannot conduct communication normally WWW SEEEDSTUDIO COM W SEEED Meanwhile when the module is set to be FU2 mode in FU1 and FU3 mode the baud rate exceeding 4 800bps will be automatically reduced to be 4 800bps In FU2 mode the sending time interval of data package cannot be too short otherwise the data will be lost It is suggested that the sending time interval of data package should not be less than Isec The following gives some characteristics reference values of various modes Mode FU1 FU2 FU3 Remark Idle current 3 6mA 80uA 16mA Average value Transmission 15 25mS 500mS 4 80mS Sending one byte time delay Loopback 31mS Serial port baud rate test time 9 600 sending one byte delay 1 Loopback 31mS Serial port baud rate test time 9 600 sending ten bytes delay 2 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 Module
11. th stamp hole can adopt patch welding and its dimension is 27 8mm X 14 4mm X 4mm including antenna cap excluding spring antenna so it is very convenient for customers to go into application system There is a PCB antenna pedestal ANT1 on the module and user can use external antenna of 433M frequency band through coaxial cable there is also an antenna solder eye ANT2 in the module and it is convenient for user to weld spring antenna User could select one of these antennas according to use requirements There is MCU inside the module and user don t need to program the module separately and all transparent transmission mode is only responsible for receiving and sending serial port data so it is convenient to use The module adopts multiple serial port transparent transmission modes and user could select them by AT command according to use requirements The average working current of three modes FU1 FU2 and FU3 in idle state is 80ua 3 6mA an 16mA respectively and the maximum working current is 100mA in transmitting state Product Configuration Standard configuration of HC 12 module only contains one 433MHz frequency band wireless communication module with IPEX20279 001E 03 standard RF socket The optional accessories are 433MHz frequency band spring antenna IPEX to BNC coaxial cable and matching 433MHz frequency band omni directional rubber antenna of BNC connector User could purchase them according to use requirements WWW SEEED
12. with FU1 FU2 and FU3 respectively In the use all modes are only responsible for receiving and sending serial port data rather than wireless transmission The default working mode of system is in FU3 full speed mode and in this mode the baud rate in this air can be automatically adjusted according to baud rate of serial port and the communication distance will be the farthest at the low baud rate Different modes cannot transmit data to each other and user could select the optimal mode according to practical circumstances The modules are usually used in pairs and transmit data by means of half duplex Meanwhile the transparent transmission mode serial port baud rate and wireless communication channel of two paired modules shall be set to be the same The default setting is FU3 9 600bps 8 dibit data no check one stop bit CH001 433 4MHz Use the number of bytes continuously sent to serial port of module unlimited to one time However considering ambient interference and other factors if thousands of data size is sent continuously at a time some number of bytes may be lost Therefore the upper computer shall have response and resending mechanism to avoid information loss 3 Three serial port transparent transmission modes When HC 12 module leaves the factory its default serial port transparent transmission mode is FU3 Then the module is in full speed state and the idle current is about WWW SEEEDSTUDIO COM W SEEED 16mA I
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