Hexin Technology HXJZ-878 10km-20km Middle Power RS-232/RS-485/TTL to RF Wireless Module - Manual (Page 5)

HXJZ-878 RF Data Radio User’s Manual
2、 HXJZ-878 Interface define:
1） User interface:
HXJZ-878 have one interface of TTL/RS232/RS485, user can choose one
Item no PIN Description User terminal Remarks
1 Null
2 TXD/A Serial data transmitting end RXD/ A (RS-485)
3 RXD/B Serial data receiving end TXD/ B (RS-485)
5 GND Ground DGND/AGND
4,6,7,8,9 Null
Item no PIN Description Level
Connected
to the terminal
User terminal Remarks
1 GND Ground
2 +12V +12V DC 9-15V DC Standard: 12V
Remarks: To avoid to connect the interface reverse and can not communicate, please check and assure the
voltage of 3 and 4 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 reverse, please change the connection wires between pin 3
and 4.
2）Power supply
HXJZ-878 power supply is 9-15V DC，Representative value is +12V DC，the current greater than 3A。
It can also share power supply with other equipment, however, the high quality power
supply 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.