Description

The VT-DTMPA-UART-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 UART 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 800 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  UART interface

l  Half Duplex communication, 8N1 format

l  3.3V DC Power Supply

l  Consumption: Transmit <140mA; Receive <25mA

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=3.3V

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.

Pin Description

Input Voltage

The input voltage of the module ranges from 2.4V to 3.6V. A clean supply voltage is needed for the module to function correctly.

Operating Modes

The device can be used in the following operating modes:

1. 1.       Transparent, Buffered data transceiver
2. 2.       Setting Mode

The operating mode can be selected by the setting pin state. If the setting pin keeps on “HIGH” level, the module will run on the setting operating mode after power up. Otherwise, if the setting switch keeps on “LOW” level, the module will run on the transparent operating mode after power up.

Transparent Mode

In this operating mode, data of the transmitter module is received via the UART interface and initially buffered. As soon as specific conditions are met (timeout or data buffer be filled full), the radio telegram is generated with preamble, Sync word, and Checksum and address information (modules address are the same). As soon as the transmission of a packet has begun, the UART interface cannot receive any further data.

The receiver module receives the wireless telegram and transmits the payload characters via UART interface. As long as receiver module is busy in sending characters via the UART interface, wireless telegram reception is not possible. For example, this effect is noticeable when sending a long data packet and subsequently a short data packet. In this case, the receiver module may still be busy in sending the first packet via UART interface and the second packet may be lost.

Setting Mode

This operation mode primary serves module configuration parameters.

In this operating mode, there are menus to guide the setting commands and configuration parameters. In order to setting the module, use a UART to RS232 Bridge to connect the module to PC, be sure to install a com assistant like Commassistant, Terminal etc. We will offer the Terminal com assistant.

The configuration parameters are saving to the on-chip flash after access the exit command. The configuration parameters take affect after reset the module when exit the setting mode. The setting commands and configuration parameters show on the Tab 1.

Tab 1 Setting Commands and Configuration Parameters