RF-Star RF-SM-1077B2 User manual

RF-SM-1077B2 Ultra-Low-Power
433 MHz & 470 MHz Wireless Module
Version 2.1
Shenzhen RF-star Technology Co., Ltd.
Apr. 09th, 2020

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TI CC131X Sub-1 GHz Module List
Chipset
Core
FLASH
(KB)
RAM
(KB)
Model
Antenna
Freq.
(MHz)
Dimension
(mm)
TX
Power
(dBm)
Range
(M)
Photo
CC1310
F128RGZ
M3
128
8
RF-SM-1077B1
IPEX
868
915
18  26
14
2500
RF-SM-1077B2
IPEX
433
470
18  26
15
2500
CC1310
F128RSM
M3
128
8
RF-SM-1044B1
PCB
868
915
14  22
14
2500
RF-SM-1044B2
PCB
868
915
9  12.5
14
2500
RF-SM-1044B4
Half-
hole
868
915
14  22
14
2500
Contact
Me
CC1352R
M4F
352
80
RF-TI1352B1
IPEX
868
915
16.8  26.5
5
BLE:
500
5
ZigBee:
300
14
868 MHz:
1500
Note:
1. The communication distance is the longest distance obtained by testing the module's maximum transmission power
in an open and interference-free environment in sunny weather.
2. Click the picture to buy modules.

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1 Device Overview
1.1 Description
RF-SM-1077B2 Sub-1 GHz module is based on TI CC1310, which combines a flexible, very low-power RF transceiver
with a powerful 48 MHz ARM® Cortex®-M3 microcontroller supporting multiple physical layers and RF standards and a
dedicated radio controller Cortex®-M0 handling RF protocol commands that are stored in ROM or RAM. RF-SM-1077B2
integrates a 24.0 MHz crystal, a balun, a band pass filter, an antenna matching and an IPEX antenna matching which
make the module low cost, low power consumption and long wireless communication in Sub-1 GHz.
RF-SM-1077B2 is flashed transparent transmission firmware with AT commands by default. The default values are as
follows: 115200 baud rate, 8 data bit, no parity check bit,1 stop bit, 433 MHz operating frequency, 15 dBm TX power.
When the module starts to work, the serial port will print “Application Start\r\n”, and start transparent transmission mode
by default, serial port will transmit all the data except “+++”, please refer to the AT command in detail.
1.2 Key Features
•Microcontroller
- Powerful ARM® Cortex®-M3 processor
- EEMBC CoreMark® Score: 142
- EEMBC ULPBench™ score: 158
- Clock speed up to 48 MHz
- 128 KB of in-system programmable flash
- 8 KB of SRAM for Cache (or as general-purpose
RAM)
- 20 KB of ultra-low-leakage SRAM
- 2-pin cJTAG and JTAG debugging
- Supports over-the-air (OTA) update
•On-Chip Internal DC/DC Converter
•Ultra-Low-Power Sensor Controller
- Can run autonomously from the rest of the
- System
- 16-bit architecture
- 2 KB of ultra-low-leakage SRAM for code and data
•RF-Section
- Excellent receiver sensitivity: –124 dBm @ long-
range mode, –110 dBm @ 50 kbps
- Excellent selectivity (±100 kHz): 56 dB
- Excellent blocking performance (±10 MHz): 90 dB
- Programmable output power up to +15 dBm
- Differential RF interface
- Suitable for systems targeting compliance with
worldwide radio frequency regulations
➢ETSI EN 300 220, EN 303 204 (Europe)
➢FCC CFR47 Part 15 (US)
➢ARIB STD-T108 (Japan)
- Wireless M-Bus (EN 13757-4) and IEEE®
802.15.4g PHY
•Peripherals
- All digital peripheral pins can be routed to any
GPIO
- Four general-purpose timer modules (eight 16-bit
or four 32-bit timers, PWM each)
- 12-bit ADC, 200 ksamples/s, 8-channel analog
MUX
- Continuous time comparator
- Ultra-low-power clocked comparator
- Programmable current source
- UART
- 2× SSI (SPI, MICROWIRE, TI)
- I2C, I2S
- Real-time clock (RTC)
- AES-128 security module

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- True random number generator (TRNG)
- Support for eight capacitive sensing buttons
- Integrated temperature sensor
•Low Power
- Wide supply voltage range: 1.8 V to 3.8 V
- RX: 5.4 mA
- TX at +10 dBm: 13.4 mA
- Active-mode MCU 48 MHz running Coremark: 2.5
mA (51 μA/MHz)
- Active-mode MCU: 48.5 CoreMark/mA
- Active-mode sensor controller at 24 MHz: 0.4 mA
+ 8.2 μA/MHz
- Sensor controller, one wake-up every second
performing one 12-bit ADC sampling: 0.95 μA
- Standby: 0.7 μA (RTC running and RAM and CPU
retention)
- Shutdown: 185 nA (wakeup on external events)
1.3 Applications
•433-, 470-MHz ISM and SRD systems
•Low-power wireless systems with 50-kHz to 5-MHz
channel spacing
•Home and building automation
•Wireless alarm and security systems
•Industrial Monitoring and Control
•Smart grid and automatic meter reading
•Wireless healthcare applications
•Wireless sensor networks
•Active RFID
•IEEE 802.15.4g, IP-enabled smart objects
(6LoWPAN), wireless M-Bus, KNX systems,
Wi-SUN™, and proprietary systems
•Energy-harvesting applications
•Electronic shelf label (ESL)
•Long-range sensor applications
•Heat-cost allocators
1.4 Functional Block Diagram
Figure 1. Functional Block Diagram of RF-SM-1077B2
CC1310
RGZ
GPIOs
Reset
IPEX
Interface
Band Pass
Filter
Power Supply
1.8 V ~ 3.8 V
Antenna
Matching
24.0 MHz
Balun
32.768 kHz

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1.5 Working Mode
Figure 2. Working Mode of RF-SM-1077B2
1.6 Part Number Conventions
The part numbers are of the form of RF-SM-1077B2 where the fields are defined as follows:
Figure 3. Part Number Conventions of RF-SM-1077B2
RF
SM
1077
RF-STAR
Company Name
Sub-1 GHz Module
Wireless Type
Chipset Manufacturer
TI CC1310F128RGZ
-
-
B2
Module Version
The Second Version

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Table of Contents
TI CC131X Sub-1 GHz Module List ............................................................................................................................ 1
1 Device Overview............................................................................................................................................................. 2
1.1 Description............................................................................................................................................................ 2
1.2 Key Features ....................................................................................................................................................... 2
1.3 Applications.......................................................................................................................................................... 3
1.4 Functional Block Diagram .............................................................................................................................. 3
1.5 Working Mode ..................................................................................................................................................... 4
1.6 Part Number Conventions.............................................................................................................................. 4
Table of Contents................................................................................................................................................................ 5
Table of Figures................................................................................................................................................................... 6
Table of Tables..................................................................................................................................................................... 7
2 Module Configuration and Functions ...................................................................................................................... 8
2.1 Module Parameters........................................................................................................................................... 8
2.2 Module Pin Diagram ......................................................................................................................................... 9
2.3 Pin Functions....................................................................................................................................................... 9
3 Specifications .................................................................................................................................................................11
3.1 Recommended Operating Conditions .....................................................................................................11
3.2 Handling Ratings..............................................................................................................................................11
3.3 Power Consumption .......................................................................................................................................11
3.3.1 Current Consumption ........................................................................................................................11
3.3.2 Power Consumption Test.................................................................................................................13
4 Functions .........................................................................................................................................................................14
4.1 Transparent Transmission............................................................................................................................14
4.2 Sensor Data Collection..................................................................................................................................14
5 AT Command..................................................................................................................................................................16
5.1 AT Command Format Description .............................................................................................................16
5.2 AT Commands...................................................................................................................................................17
5.2.1 Start / Exit AT Command Mode .....................................................................................................17
5.2.2 Parameter Query / Configuration..................................................................................................17
5.2.3 RF Power Query / Configuration...................................................................................................17

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5.2.4 Channel Query / Configuration......................................................................................................18
5.2.5 Received RSSI Query.......................................................................................................................18
5.2.6 Device MAC Address Query...........................................................................................................18
5.2.7 Enable / Disable AD Voltage Collection.....................................................................................18
5.2.8 Software / Hardware Version Query............................................................................................19
5.2.9 Module Restart.....................................................................................................................................19
5.2.10 Module Reset.....................................................................................................................................19
5.2.11 AT Command Table..........................................................................................................................19
6 Application, Implementation, and Layout.............................................................................................................22
6.1 Module Photos..................................................................................................................................................22
6.2 Recommended PCB Footprint....................................................................................................................22
6.3 Antenna................................................................................................................................................................23
6.4 Schematic Diagram.........................................................................................................................................24
6.5 Basic Operation of Hardware Design ......................................................................................................24
6.6 Trouble Shooting..............................................................................................................................................25
6.6.1 Unsatisfactory Transmission Distance........................................................................................25
6.6.2 Vulnerable Module..............................................................................................................................25
6.6.3 High Bit Error Rate .............................................................................................................................26
6.7 Electrostatics Discharge Warnings ...........................................................................................................26
6.8 Soldering and Reflow Condition.................................................................................................................26
6.9 Optional Packaging.........................................................................................................................................27
7 Certification .....................................................................................................................................................................28
7.1 Reach ...................................................................................................................................................................28
7.2 RoHS ....................................................................................................................................................................28
8 Revision History ............................................................................................................................................................29
9 Contact Us.......................................................................................................................................................................30
Table of Figures
Figure 1. Functional Block Diagram of RF-SM-1077B2............................................................................. 3
Figure 2. Working Mode of RF-SM-1077B2.................................................................................................... 4
Figure 3. Part Number Conventions of RF-SM-1077B2 ............................................................................ 4
Figure 4. Pin Diagram of RF-SM-1077B2........................................................................................................ 9

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Figure 5. Photos of RF-SM-1077B2.................................................................................................................22
Figure 6. Recommended PCB Footprint of RF-SM-1077B2 (mm) ......................................................22
Figure 7. Specification of Antenna Seat .........................................................................................................23
Figure 8. Specification of IPEX Wire................................................................................................................23
Figure 9. Schematic Diagram of RF-SM-1077B2 .......................................................................................24
Figure 10. Recommended Reflow for Lead Free Solder .........................................................................27
Figure 11. Optional Packaging Mode ..............................................................................................................27
Figure 12. SRRC Certificate................................................................................................................................28
Figure 13. RoHS Certificate ................................................................................................................................28
Table of Tables
Table 1. Parameters of RF-SM-1077B2 ........................................................................................................... 8
Table 2. Pin Functions of RF-SM-1077B2 ....................................................................................................... 9
Table 3. Recommended Operating Conditions of RF-SM-1077B2......................................................11
Table 4. Handling Ratings of RF-SM-1077B2 ..............................................................................................11
Table 5. Current Consumption of RF-SM-1077B2......................................................................................11
Table 6. Power Consumption of RF-SM-1077B2........................................................................................13
Table 7. AT Command Table.............................................................................................................................19

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2 Module Configuration and Functions
2.1 Module Parameters
Table 1. Parameters of RF-SM-1077B2
Chipset
CC1310F128RGZ
Supply Power Voltage
1.8 V ~ 3.8 V, recommended to 3.3 V
Frequency
433 MHz, 470 MHz
Maximum Transmit Power
+15.0 dBm
Receiving Sensitivity
-124.0 dBm (@long range mode)
-110.0 dBm (@50 kpbs)
GPIO
30
Crystal
24 MHz, 32.768 kHz
RAM
20 KB
Flash
128 KB
Package
SMT Packaging
Frequency Error
±20 kHz
Dimension
26.0 mm x 18.0 mm x (2.3 ± 0.1) mm
Type of Antenna
IPEX interface
Operating Temperature
-40 ℃ ～ +85 ℃
Storage Temperature
-40 ℃ ～ +125 ℃

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2.2 Module Pin Diagram
Figure 4. Pin Diagram of RF-SM-1077B2
2.3 Pin Functions
Table 2. Pin Functions of RF-SM-1077B2
Pin
Name
Chip Pin
Pin Type
Description
1
P01
DIO_1
Digital I/O
GPIO, Sensor Controller
2
P02
DIO_2
Digital I/O
RX (GPIO, Sensor Controller)
3
P03
DIO_3
Digital I/O
TX (GPIO, Sensor Controller)
4
P04
DIO_4
Digital I/O
GPIO, Sensor Controller
5
P05
DIO_5
Digital I/O
GPIO, Sensor Controller
6
P06
DIO_6
Digital I/O
GPIO, Sensor Controller
7
P07
DIO_7
Digital I/O
GPIO, Sensor Controller
8
P08
DIO_8
Digital I/O
GPIO
9
P09
DIO_9
Digital I/O
GPIO

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10
P10
DIO_10
Digital I/O
GPIO
11
P11
DIO_11
Digital I/O
GPIO
12
P12
DIO_12
Digital I/O
GPIO
13
P13
DIO_13
Digital I/O
GPIO
14
P14
DIO_14
Digital I/O
GPIO
15
P15
DIO_15
Digital I/O
GPIO
16
TMS
JTAG_TMSC
-
JTAG TMS
17
TCK
JTAG_TCKC
-
JTAG TCK
18
P16
DIO_16
Digital I/O
JTAG TDO
19
P17
DIO_17
Digital I/O
JTAG TDI
20
P18
DIO_18
Digital I/O
GPIO
21
P19
DIO_19
Digital I/O
GPIO
22
P20
DIO_20
Digital I/O
GPIO
23
P21
DIO_21
Digital I/O
GPIO
24
P22
DIO_22
Digital I/O
GPIO
25
RESET
RESET_N
-
Reset, active low. No internal pullup.
26
P23/ADC0
DIO_23
Digital or analog I/O
GPIO, Sensor Controller, analog
27
P24/ADC1
DIO_24
Digital or analog I/O
GPIO, Sensor Controller, analog
28
P25
DIO_25
Digital or analog I/O
GPIO, Sensor Controller, analog
29
P26
DIO_26
Digital or analog I/O
GPIO, Sensor Controller, analog
30
P27
DIO_27
Digital or analog I/O
GPIO, Sensor Controller, analog
31
P28
DIO_28
Digital or analog I/O
GPIO, Sensor Controller, analog
32
P29
DIO_29
Digital or analog I/O
GPIO, Sensor Controller, analog
33
P30
DIO_30
Digital or analog I/O
GPIO, Sensor Controller, analog
34
VCC
VCC
-
1.8 V ~ 3.6 V, recommended to 3.3 V
35
ANT
-
-
External antenna pin
36
GND
GND
-
ground

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3 Specifications
3.1 Recommended Operating Conditions
Functional operation does not guarantee performance beyond the limits of the conditional parameter values in the table
below. Long-term work beyond this limit will affect the reliability of the module more or less.
Table 3. Recommended Operating Conditions of RF-SM-1077B2
Items
Condition
Min.
Typ.
Max.
Unit
Operating Supply Voltage
Battery Mode
1.8
3.3
3.8
V
Operating Temperature
/
-40
+25
+85
℃
Environmental Hot Pendulum
/
-20
+20
℃/min
Notes:
To ensure the RF performance, the ripple wave on the source must be less than ±200 mV.
3.2 Handling Ratings
Table 4. Handling Ratings of RF-SM-1077B2
Items
Condition
Min.
Typ.
Max.
Unit
Storage Temperature
Tstg
-40
+25
+125
℃
Human Body Model
HBM
±3000
V
Moisture Sensitivity Level
2
Charged Device Model
±500
V
3.3 Power Consumption
3.3.1 Current Consumption
The current consumption characteristics of this module are categorized into different running modes. The overall product
level current consumption is averaged over time on different power modes the device runs on. The peripheral circuitry’s
current consumption also adds in.
Table 5. Current Consumption of RF-SM-1077B2
Parameter
Test Conditions
Min.
Typ.
Max
Unit
Core Current Consumption
Icore
Core current
Reset. RESET_N pin asserted or VDDS below
power-on-reset (POR) threshold
100
nA

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consumption
Shutdown. No clocks running, no retention
185
nA
Standby. With RTC, CPU, RAM and (partial)
register retention. RCOSC_LF
0.7
μA
Standby. With RTC, CPU, RAM and (partial)
register retention. XOSC_LF
0.8
μA
Idle. Supply Systems and RAM powered.
570
μA
Active. MCU running CoreMark at 48 MHz
1.2 mA + 25.5
µA/MHz
Active. MCU running CoreMark at 48 MHz
2.5
mA
Active. MCU running CoreMark at 24 MHz
1.9
mA
Radio RX, 868 MHz
5.5
mA
Radio TX, 10-dBm output power, (G)FSK, 868
MHz
13.4
mA
Radio TX, OOK modulation, 10-dBm output
power, AVG
11.2
mA
Radio TX, boost mode (VDDR = 1.95 V), 14-dBm
output power, (G)FSK, 868 MHz
23.5
mA
Radio TX, OOK modulation, boost mode (VDDR
= 1.95 V), 14 dBm, AVG
14.8
mA
Radio TX, boost mode (VDDR = 1.95 V), 15-dBm
output power, (G)FSK, measured on RF-SM-
1077B2, 433.92 MHz
25.1
mA
Radio TX, 10-dBm output power, measured on
RF-SM-1077B2, 433.92 MHz
13.2
mA
Peripheral Current Consumption (Adds to core current Icore for each peripheral unit activated) (1) (2) (3)
Iperi
Peripheral
power
domain
Delta current with domain enabled
20
µA
Serial power
domain
Delta current with domain enabled
13
µA

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RF Core
Delta current with power domain enabled, clock
enabled, RF core idle
237
µA
µDMA
Delta current with clock enabled, module idle
130
µA
Timers
Delta current with clock enabled, module idle
113
µA
I2C
Delta current with clock enabled, module idle
12
µA
I2S
Delta current with clock enabled, module idle
36
µA
SSI
Delta current with clock enabled, module idle
93
µA
UART
Delta current with clock enabled, module idle
164
µA
Note:
(1) Adds to core current Icore for each peripheral unit activated.
(2) Iperi is not supported in standby or shutdown modes.
(3) Measured at 3.0 V.
3.3.2 Power Consumption Test
Table 6. Power Consumption of RF-SM-1077B2
Mode
Min. Current
Max. Current
Average Current
Samples
Idle
1.29 mA
1.32 mA
1.31 mA
5000
Standby
68 nA
69.2 µA
980 nA
5000
Shutdown
52 nA
88 nA
79 nA
5000
RF-RX
5.2 mA
5.7 mA
5.4 mA
5000
RF-TX
-
25.2 mA (15 dBm)
-
-
Note:
Test conditions: battery power supply: 2.88 V. Test instrument: RIGOL DM3068 digital multimeter.
Data of RF-TX only provide peak value as a reference, the average power is proportional to the frequency of data
transmission.

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4 Functions
4.1 Transparent Transmission
Transparent transmission mode is that the data is transmitted to a remote device.
The function is realized under the following conditions:
1. Two or more devices are in the same frequency.
2. The address of the devices are allowed to connect each other.
Users can define the channel of each device according to the condition, and only the devices which are in the same
frequency and the same channels can communicate. The device channel can be defined by AT command, please kindly
refer to the chapter of “AT Command”.
Transparent transmission rate: The device communicates through RF under IEEE 802.15.4g standard with three
transmission rates: 625 bps, 50 Kbps, 200 Kbps.
Data confirmation process mechanism is contained in transparent transmission. The mechanism contains timeout of
receiving confirmation packet. This protocol defines the values of timeout period in different mode:15 ms for 200 Kbps,
35 ms for 50 Kbps, 500 ms for 625 bps. At the same time, the packet sizes are regulated according to the different
modes:128 bytes for 200 Kbps and 50 Kbps data rate mode (the serial number size of the packet contains 2 bytes, so
the actual packet size is no more than 126 bytes), and 30 bytes for 625 bps data rate mode (the serial number size of
the packet contains 2 bytes, so the actual packet is no more than 28 bytes). When the packet size is over the defined
maximum packet size, the default processing mechanism is only sending packets with the same defined packet size,
and the extra data will be discarded directly.
Transparent transmission mechanism: The device starts transparent transmission mode by default when power on,
that is to say, the data which received from the serial port will be transmitted. "+++" string is the startup command of AT
command, transparent transmission mode will be disabled when serial port receives this command, and then the module
enters into AT command mode (please refer to “AT command” chapter for details). The module will enter into transparent
transmission mode after exiting AT command mode.
This module is designed for long distance transmission and lower data transmitting rate, transparent transmission mode
is recommended when lower requirement on low transmission rate.
4.2 Sensor Data Collection
CC1310 integrates a Sensor Controller, which supports data collection under low power mode. RTC provides work clock
for Sensor Controller, e.g. Sensor Controller executes operation every 100 ms when RTC clock settled in 100 ms, after
the operation executed. Sensor Controller will enter into low power consumption mode automatically. Application layer
can control the data collection frequency of sensor through RTC. Sensor Controller controls 7 digital I/Os (DIO1 ~ DIO7),
8 digital/simulation I/Os (DIO23 ~ DIO30), and these I/Os can be configured as SPI, I2C, ADC etc.

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This protocol is configured with AD voltage acquisition function by default. This function enables two ADC channels
(channel 0 is DIO23, channel 1 is DIO24). AD voltage acquisition range is 0 V~ 3.8 V. Sensor Controller control RTC to
provide the clock for AD acquisition, and collect data once every second by default. Users can control the enable and
disable of AD voltage collection through AT commands (please refer to “AT command” chapter for details).

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5 AT Command
The string which starts with "AT#" will be parsed and executed as an AT command, and the AT command will be returned
from the serial port as it is. Then the execution result will be output. "OK↲" means successful operation, "ERROR↲"
means error operation, and "FAIL↲" means failed operation.
5.1 AT Command Format Description
AT command format: "AT#EXIT" + "Enter". The letters in AT commands are not case-sensitive unless otherwise
specified. The specific format is as follows:
AT command start character: All AT commands must start with "AT" characters, which is not case-sensitive.
Command delimiter: The separator of "AT" start character and the command type is fixed as "#" character.
AT command type: AT command type, such as "RF", "UART", which is not case-sensitive.
Parameter separator: Parameter separator is used to separate the command type and configuration parameters or
separate multiple configuration parameters, which is fixed as a space bar.
Parameter start character: The configuration parameter start character indicates the start character of the configuration
parameter, which is fixed as "-".
Parameter identifier: Parameter identifier indicates the meaning of the configuration parameter. The different
configuration parameters of the identifier will be different, which is not case-sensitive. Please refer to “AT Command” for
details.
Parameter configuration: Different configuration parameters have different range of values, please refer to t“AT
Command” for details.
Command end character: AT Command terminator is used to indicate that the command ends, which is fixed as
carriage return linefeed “↲”(\r\n).

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5.2 AT Commands
5.2.1 Start / Exit AT Command Mode
"+++": Start AT command mode.
Enter the command into serial port means that the device will enter into AT command mode. When the serial port prints
"OK↲", which means start the AT command mode successfully. Then the data received from the serial port will be
regarded as AT command.
"AT#EXIT↲": Exit AT command mode.
Enter the command into serial port means that the device will exit AT command mode and then enter into transparent
transmission mode. When the serial port prints "OK↲", which means exit AT command mode successfully. Then the
data except "+++" received from the serial port will be transmitted as transparent data.
5.2.2 Parameter Query / Configuration
"AT#UART↲": Query parameter.
Enter the command into the serial port. When the serial port prints "OK↲", which means successful operation, in the
meanwhile, the device parameters will be returned. If “AT#UART-Bxxxx-Dx-Px-Sx” is returned, where “-B” is the baud
rate, “-D” is the data bit, “-P” is the parity bit, “-S” is the stop bit. If the command format is incorrect, the serial port will
return "ERROR↲".
"AT#UART-Bxxxx-Dx-Px-Sx↲": Configure parameter.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In this
command, “-B” is the baud rate, “-D” is the data bit, “-P” is the parity bit, “-S” is the stop bit. If the instruction format is
incorrect, the serial port will return "ERROR↲".
The parameter configuration command is saved into FLASH by default. After the devices is restarted, the device will
start with the parameters set in FLASH.
Default configuration: 115200 baud rate, 8 data bit, no parity bit, 1 stop bit.
5.2.3 RF Power Query / Configuration
"AT#RF↲": Query Tx power.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the RF output power of the device will be returned. If "AT#RF-Px↲" is returned, where “-Px” means the RF
output power. If the command format is incorrect, the serial port will return "ERROR↲".
"AT#RF-Pxx↲": Configure RF power.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the

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command, “-Px” means the RF output power. The parameter of RF-SM-1077B2 supports any value of -10 dBm ~ 15
dBm. If the command format is incorrect, the serial port will return "ERROR↲".
Default configuration: RF-SM-1077B2: output power of 15 dBm (@ 433 MHz).
5.2.4 Channel Query / Configuration
"AT#CHN↲": Query channel.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the channel of this device will be returned. If "AT#CHN-Cx↲" is returned, where “-Cx” means the channel
parameter. If the command format is incorrect, the serial port will return "ERROR↲".
"AT#CHN-Cx↲": Configure channel.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
command, “-C” means the RF channel. The parameter of RF-SM-1077B2 supports any value from 0 to 6. If the command
format is incorrect, the serial port will return "ERROR↲".
Default configuration: channel 0.
5.2.5 Received RSSI Query
"AT#RSSI↲": Query received RSSI.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the received signal strength indicator value of the device for the last time will be returned. If "AT#RSSI-Rx↲"
is returned, where “-Rx” means the RSSI. If the command format is incorrect, the serial port will return "ERROR↲".
If the command is entered when the device have no data received, the default return value is 255.
5.2.6 Device MAC Address Query
"AT#RSSI↲": Query device MAC address.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the 6-byte MAC address of the device will be returned. If "AT#MAC-Mxxxxxxxxxxxx↲" is returned, where “-
Mxxxxxxxxxxxx” means the MAC address. If the command format is incorrect, the serial port will return "ERROR↲".
5.2.7 Enable / Disable AD Voltage Collection
"AT#ADC-Ex↲": Collect AD voltage.
In this command, “-E” means enable AD voltage collection function. If x is 1, which means start AD voltage collection. If
x is 0, which means disable AD voltage collection. Enter the command into serial port. When the serial port prints "OK↲",
which means successful operation. If enable AD voltage collection function, the device will start AD voltage collection in

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ADC channel 0,1, and the serial port will return data in ADC channel 0,1 every second. If disable AD voltage collection
function, the device will stop AD voltage acquisition in ADC channel 0,1 and no data return. AD voltage collection
supports 0 V ~ 3.8 V, and the serial port return value is the integer from 0 mV to 3800 mV.
5.2.8 Software / Hardware Version Query
"AT#VER↲": Query module software / hardware version.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the software and hardware version number will be returned. If "AT#VER-Sm1.0.0-D1077B2↲" is returned,
where “-S” means software and the string of “m1.0.0” means the version number is1.0.0, “-Dx” means hardware and the
string of “1077B2” means the hardware version is 1077B2.
5.2.9 Module Restart
"AT#RESTART↲": Restart module.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, the device will be automatically restarted after 100 ms. After restart is done, the serial port prints "Application
Start↲". If users want to enter the AT command mode again, "+++" need to be sent, please refer to AT command chapter
for details.
5.2.10 Module Reset
"AT#RESET↲" is module reset command.
Enter the command into serial port. When the serial port prints "OK↲", which means successful operation. In the
meanwhile, all the parameters of the device are restored to the factory settings when the device starts next time.
5.2.11 AT Command Table
Table 7. AT Command Table
AT command
Parameters
Description
+++
No
•"+++": Start AT command mode.
"OK" indicates successful operation. Otherwise, the operation failed.
AT#EXIT
No
•"AT#EXIT↲": Exit AT command mode.
"OK" indicates successful operation. Otherwise, the operation failed.
AT#VER
No
•"AT#VER↲": Query Module software and hardware version.
"OK" indicates successful operation and the serial port will return
software and hardware version, such as: AT#VER-Sm1.0.0-D1077B1.
Otherwise, the operation failed.