DeLOCK 12951 User Manual
User manual
IoT LoRa Radio Module 868 MHz 20 dB TTL (3.3 V)
Product-No:12951
User manual no:12951-a
www.delock.com
Main parameter
Performance
Notes
Min.
Max.
Power supply（V）
Voltage over 5.2V will cause permanent
Blocking power（dBm）
Chances of burn is slim when modules
Operating temperature
-40
85
-
Main parameter
Performan
ce
Min
Typ.
Max.
Operating voltage（V）
3.3
5.0
5.2
≥5.0 V ensures output power
Communication level（V）
For 5V TTL, it may be at risk of
Operating temperature
-40
-
85
Industrial design
Operating frequency（MHz）
862
-868
893
Support ISM band
Power
Transmitting current [mA]
-
106
-
Instant power consumption
Receiving current [mA]
-
15
-
-
Max Tx power（dBm）
19.2
-
20.0
-
Receiving sensitivity（dBm）
-144
-146
-147
Air data rate is 2.4kbps
Air data rate（bps）
0.3k
2.4k
19.2k
Controlled via user’s programming
Main parameter
Description
Remark
Test condition：clear and open area, antenna gain: 5dBi，
Maximum capacity of single package, automatic
Buffer
512 Btye
-
Modulation
LoRa™
-
1. Specification and parameter
1.1 Limit parameter
（℃）
1.2 Operating parameter
（℃）
0 5.2
- -10
- 3.3 -
damage to module
are used in short distance
Remark
burning down
consumptio
n
Turn-off current [μA]
Distance for reference 3000m
TX length 58 Btye
- 4 - Software is shut down
antenna height: 2.5m，air data rate: 2.4kbps
subcontracting after exceeding
-1-
Communication interface
TTL
@3.3V
Package
DIP
-
Connector
2.54mm
-
Size
21 * 36mm -
Antenna
SMA-K
50 ohm impedance
No.
Name
Direction
Function
Input
Work with M1 to decide 4 working modes of module (not suspended, if
2. Size and pin definition
1 M0
（weak pull-up）
not used, could be grounded).
-2-
Input
Work with M0 to decide 4 working modes of module (not suspended, if
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can
4
TXD
Output
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can
be configured as open-drain or push-pull output
To indicate module ’ s working status & wakes up the external MCU.
6
VCC
Input
Power supply ：2.3~ 5.2V DC
7
GND
Input
Ground
8
Fixed orifice
-
Fixed orifice
9
Fixed orifice
-
Fixed orifice
10
Fixed orifice
-
Fixed orifice
No.
Description（STM8L MCU）
2 M1
3 RXD Input
5 AUX Output
（weak pull-up）
not used, could be grounded).
be configured as open-drain or pull-up input.
During the procedure of self-check initialization, the pin outputs low
level. Can be configured as push-pull output (suspending is allowed).
3. Connect to MCU
1 The UART module is TTL level.
2 For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
-3-
4. Function description
4.1 Fixed transmission
4.2 Broadcasting transmission
4.3 Broadcasting address
For example: Set the address of module A as 0xFFFF or 0x0000, and the channel as 0x04;
-4-
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