JZC TELECOM
Technology
JZX874 A/B Micro Power Wireless Module
SHENZHEN JZC TELECOM TECHNOLOGY CO., LTD
TEL
：
0755-86714296
Tech:0755-61319411/61319410
WEB: http://www.rfmodules.net/
JZX874A/B module is the use of aluminum alloy shield wireless module, there is a strong
anti-static and anti-jamming, the module uses ISM frequency band, without application frequency;
can be set to 16 communication channels,
According to transmit power divided into: (874A:
transmission power less than 100mW, high receiving sensitivity-120dbm. 874B: transmit power
less than 500mW, high receiving sensitivity-123dbm)
, size 70mm * 45mm * 19mm (main module),
and produced JZX874C interface module supporting a large number for wireless meter reading,
reactive power compensation industry, easy to use.
JZX874A/B the use of transparent transmission mode, the user's system in order to ensure
reliable and stable increase in the transmission or the CRC checksum error detection mode, the
error data retransmission. Transceiver module buffer of 512bytes, means that users can be in any
state 512bytes of data transfer 1, when the speed is greater than the serial port is set to air rate, is
theoretically unlimited length can send information packets, but does not recommend users to send
long data packets, the proposed length of each packet data between 60 ~ 100B, generally not
longer than the 120B, and recommended user program using the ARQ mode, the error data packets
retransmission. As follows:
If the actual error rate 10-4, users need to send 1KB about 10000bit information, if the 1KB data
as a packet, sent at least theoretically, there will be a data error in the receiver, then the 1KB data
can never be received correctly. If it is divided into 10 packages, each package 100B, then send 10
packets, the packets according to a probability of only 1 error, the error in the form of a packet
retransmission by ARQ 1, although it took more than 1 packet and the efficiency decreased by
about 10%, but it can guarantee all the information is correctly received.
JZX874A/B set parameters, the market is no longer used wireless modules used in the traditional
way to change the parameters of the jumper, causing long-term use because it brings bad, options
less dynamic change is not easy, a lot of inconvenience. JZX874A/B using the serial port setting
parameters easy and quick, easy set refers to the chip embedded in the user program and operating
software in the background. Meanwhile module 1200/2400/4800/9600/19200bps five kinds of rate
and 8 frequencies; provide USB interface mode, it need only install with the provided USB driver,
you can get on a COM port on the PC for users to use.
