Hexin Technology HXJZ-877 2000m-3000m Low Power RS-232/RS-485/TTL to RF Wireless Module - Manual (Page 5)

HXJZ-877 Mini Power Wireless Module User’s Manual
Remarks:
To avoid to connect the interface reversely and can not communicate, please check and assure the voltage of
2 and 3 pin is existing by using multimeter. If there is one pin that has the voltage, another has not voltage,
which means the interface is connected reversely, pls. Change the connection wires between pin 2 and 3
2) Power supply
HXJZ-877 uses DC power supply with v oltage of +5V.
It can also share power with other equipment, however, the high quality power with desirable ripple
factor should be selected. In addition, the reliable grounding must be used if there is other device in the system
equipment. In case of failure to connect with the earth, it can form its own grounding ,but it must be absolutely
separated from the municipal electric supply.
3.Saving power model
HXJZ-877 have three Power-Saving models: Awaken from Hardware, Awaken from COM Port, Awaken
from Air. The model can be set by RF Module software. The user can choose Power -Saving model, the default
model is “Awaken from Hardware”.
1) Awaken from Hardware:
In this model, the current is under 100uA.
Sleeping status: when you input low level at NO. 5 pin , HXJZ-877 can sleep, but it can not transmit and
receive data.
Normal work status: when you input High level at NO. 5 pin, JZ873 turn into Normal work status, 10ms
later, it can transmit and receive data.
Remarks: if you keep the NO. 5 pin untouched, then HXJZ-877 is in Normal work status.
2) Awaken from COM Port:
When HXJZ-877 in this model, the current is under 11mA.
When you input data with COM port, HXJZ-877 turn into Normal work status after 10mS and can
transmit the data.
When HXJZ-877 not receive data in COM port in 20 seconds , HXJZ-877 will turn into sleep status.
3) Awaken from Air:
In this model, the current is under 20mA.
When in this status, HXJZ-877 works intermittently.
When HXJZ-877 received data from air, HXJZ-877 will turn into Normal work status after 10ms, It can
receive data normally.
When HXJZ-877 not receive data from air in 20 seconds, It will turn into sleep. So when you choose
User’s equipment
+5v regulator n. power supply
transmitter-receiver