VT-DTMUA5-433M
RF Transceiver Module
User’s guide
V-Chip Microsystems, Inc
Add：6 floor, Longtang Building, Nan Shan Cloud Valley Innovation Industrial
Park, No.1183, Liuxian Road, Nanshan District, Shenzhen city
Tel：86-755-88844812
Fax：86-755-22643680
E-mail：sales@digirf.com
ZIP：518055
Web：www.digiRF.com
Copyright @ 2013 V-chip Microsystems,Inc Version: VTDTMUA5-MARCH-2013 v5.0
VT-DTMUA5-433
Description
The VT_DTMUA5-433M 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 packet between two or more parties is required.
A USB interface (Virtual COM Port Device) whose data rate is adjusted flexibly is available for
communicating with the host systems. The data rate can be adjusted from 2.4kbps to 230.4kbps.
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
GFSK modulation
Communication distance up to 1200 meter
Supports addressing transparent communication
Auto add preamble, checksum, address information
Supports setting mode to configure parameters Channel, Interface
Band Rate, Radio Data Rate, Output Power, Source Address,
Destination Address
USB interface (Virtual COM Port Device)
Half Duplex communication, 8N1 format
5.0V DC Power Supply, Input voltage from a USB device
Consumption: Transmit <250mA; Receive <55mA
Optional Antenna
Application
Automatic Meter Reading
Wireless Sensor Network
Data Collector
Controls, Remote Controls
POS Systems
Building Automation
Android Controls
Copyright @ 2013 V-chip Microsystems,Inc Version: VTDTMUA5-MARCH-2013 v5.0
VT-DTMUA5-433
Specification
Testing condition：Ta=25°C, VCC=5.0V
Parameter
Value
Condition/Note
Center Frequency
433MHz
Programmable
Modulation
GFSK
Customize for ASK/FSK/OOK/MSK
Output Power
Max: 27dBm
Programmable
Sensitivity
-110dBm
1.2kbps
Radio Data Rate
Max 500kbps
Programmable
USB Interface Rate
Max 230.4kbps
Programmable
Protocol Format
8N1
Programmable
Transmit Current
<250mA
Depend on output power
Receive Current
<55mA
Distance
1200 meter
Open area; 27dBm; 2.4kbps
Operate Humidity
10%～90%
Operate Temperature
-40℃～85℃
Input Voltage
5.0VDC±10%
±100mV
Antenna
50ohm
Size
91.5 ×26.0 × 12.0mm
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.
Copyright @ 2013 V-chip Microsystems,Inc Version: VTDTMUA5-MARCH-2013 v5.0
VT-DTMUA5-433
Driver
The USB interface is a virtual COM Port Device base on USB to UART bridge solution. Install the drivers
before connecting the module to a computer.
The virtual COM Port Device can be found as the Fig 1 shows.
Fig 1 Virtual COM Port Device
Input Voltage
The input voltage of the module ranges from 4.5V to 5.5V. A clean supply voltage is needed for the module
to function correctly.
LEDs
There are 3 LEDs install in the module：
RED_LED: Power-on indicates.
BLUE_LED: Receive data indicate.
GREEN_LED: Transmit data indicate.
Operating Modes
The device can be used in the following operating modes:
1. Transceiver, Buffered data transceiver
2. Setting Mode
The device is default on transparent mode and can select by commands. See “Setting Mode” part in detail.
Transceiver Mode
Transparent mode:
In this operating mode, data of the transmitter module is received via the USB 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 USB interface cannot receive any further data.
The receiver module receives the wireless telegram and transmits the payload characters via USB interface.
As long as receiver module is busy in sending characters via the USB 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 USB interface and the
second packet may be lost.
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