Specifications of 433MHz module for transmitting and receiving
wireless data
©
2004-2008 Sure Electronics Inc.
GP-GC010_Ver1.0_page 2
PIN 7: for module of 433MHz type, this pin is reserved. This IO is input.
PIN 8: Frequency Setting Enable Port, active low. This IO is input.
Notes:
The interface level of this module conforms to 3V TTL standard. Therefore the level must be
converted before it can be connected with RS232 interface of PC. Both interfaces can be
directly interconnected if the IO of high logic that connected with the module’s interface is
“weak pull-up’ type (like standard IO of MCU) when the module is used in a 5v system and
supplied with low voltage. However, if the IO on high voltage side is “strong pull-up” type
(like the output of 74HC chip and output of 232 chip empowered by 5v supply), level
conversion must be carried out before connection. A simple solution is to insert a 1k resistor
between IO of 5v logic and 3v logic. Those unused output pins of the module must be
suspended and unused input pins and “reserved” pins may remain suspended or pulled up
by resistor to VCC. The upper rated voltage of module 433MHzFSK is 4.2v, if exceeded (e.g.
5v input), potential instability might be occurring, or malfunction might take place and even
endanger the module, so it is not recommended to put this module directly into a 5v system.
How to use this module:
Firstly, make sure the Enable Port PIN5 is maintained as low level.
PIN8 must be maintained as high level or suspended during data transmission and
reception.
Data Reception:
When valid data has been received by the module, demodulated data will be transmitted
serially from TXD automatically. Busy port maintains low level during data frame
transmission, and turns into high when data frame transmission has been finished or no
valid data has been received.
Data Transmission:
Module of 433MHz type:
When the level of “Busy” indicates high, data could be directly feed into RXD terminal in
standard serial communication format in series. The module will automatically switch into
transmission status if the data input stops for
approximately 10 ms long. In programming
application, please stop for at least 15 ms.
