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Help CenterRS485 Interface GFSK Modulation Transmit Distance 1KM Wireless Module
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Description
The VT-DTMPA-485-433M module is designed as a wireless sub module for wireless communication between devices like controls, POS systems, data collectors etc. It offers several addressing modes and relieves the host systems of wireless-specific task such as checksum calculation, address resolution.
It can be deployed whenever the wireless exchange of data packetbetween two or more parties is required.
A RS485 interface whose data rate is adjusted flexibly is available for communicating with the host systems. The data rate can be adjusted from 2.4kbps to 115.2kbps.
Thanks to its small size and the external SMA antenna connector, the module can easily be installed in existing systems without any external circuits.
Key Features
l GFSK modulation
l Communication distance up to 1000 meter
l Supports addressing transparent communication
l Auto add preamble, checksum, address information
l Supports setting mode to configure parameters Channel, Interface
Band Rate, Radio Data Rate, Output Power, Source Address,
Destination Address
l RS485 interface
l Half Duplex communication, 8N1 format
l 5.0V DC Power Supply
l Consumption: Transmit <250mA; Receive <55mA
l Optional Antenna
Application
l Automatic Meter Reading
l Wireless Sensor Network
l Data Collector
l Controls, Remote Controls
l POS Systems
l Building Automation
l Android Controls
Specification
Testing condition:Ta=25°C, VCC=5.0V
Parameter |
Value |
Condition/Note |
Center Frequency |
433MHz |
Programmable, up to 6 channels |
Modulation |
GFSK |
Customize for ASK/FSK/OOK/MSK |
Output Power |
Max: 25dBm |
Programmable, 0-25dBm |
Sensitivity |
-110dBm |
2.4kbps |
Radio Data Rate |
Max 500kbps |
Programmable, 2.4-500kbps |
RS485 Interface Rate |
Max 115.2kbps |
Programmable, 2.4-115.2kbps |
Protocol Format |
8N1 |
Customizable |
Data Buffer |
Tow 100 bytes |
|
Transmit Current |
<250mA |
Depend on output power |
Receive Current |
<55mA |
|
Distance |
1000 meter |
Open area; Max output power; 2.4kbps Radio Date Rate |
Operate Humidity |
10%~90% |
|
Operate Temperature |
-40℃~85℃ |
|
Input Voltage |
5.0VDC±10% |
±100mV |
Antenna |
50ohm |
|
Size |
|
|
Note:
1. Noted that higher radio data rate causes of shorter communication disdance.
2. Noted that higher radio data rate causes of lower sensitivity.
3. Noted that lower input voltage causes of lower output power.
4. Noted that the operate temperature out of range -40℃~85℃ will influence the center frequency.
5. Be sure to use a match antenna and mount it in the right way.
6. The environment will influence the communication disdance much.
Module Description
Device |
Type |
Description |
|
Interface |
VCC |
Input Voltage |
DC5V±10% |
GND |
GND |
Connect to the system GND |
|
RESET |
Reset signal input |
TTL level, 10ms low level to reset the module |
|
SLEEP |
Sleep |
Not available |
|
A |
Serial port |
RS485-A(D+) |
|
B |
Serial port |
RS485-B(D-) |
|
SET |
Setting |
Not available |
|
Reset Key |
RESET Signal Input |
Reset the module |
|
Setting Switch |
Input |
Switch the module to work on setting mode |
|
D1 |
LED1 |
Indicating the communicate state |
|
D2 |
LED2 |
Indicating the communicate state |
|
SMA connector |
Antenna |
Connect external antenna of 50ohm |
|
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