HAC-UM Series RF Module Manual SHENZHEN HAC TECHNOLOGY CO., LTD.
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c. Magnetic antenna:
XP433-300H-SMA, include magnetic antenna base, suitable for
equipment with metal shell, easy for fixing, effective to enhance the transmission distance.
d. Spring antennas:
HAC-TH433-B, suitable for embedding in minitype equipment without
metal shield, low cost.
If the user has special demands on antennas, we can design and produce for them specially.
IV.
Networking Application of HAC-UM Series
The communication channel of HAC-UM is half duplex, which is most suitable for the
communication mode of point to multi-point. Under this mode, one master station must be
set, and all of the rest are slave stations. A unique address is given to each station. The
coordination of communication is controlled by master station that uses data frames
containing address code to transmit data or command. Slave station will receive all of the
data and command and compare the received address code with local address code. If they
are different, the data will be deserted without any response. If those address codes are the
same, it means the data is sent to the local. Slave station will make different responses
according to the transmitted data or command and send back the data of response. All these
jobs must be performed by upper protocol, and it is assured that there is only one
transmitter-receiver in the state of transmission in the communication network at any instant
moment so as to avoid the cross-interference.
HAC-UM can also be used for point-to-point communication with easier operation. For the
programming of serial port, all you have to do is to remember that its communication mode is
semi duplex while always observing the time sequence of come-and-go for receiving and
transmitting.
